diff --git a/scripts/init.sh b/scripts/init.sh
index 00d7a4b8..46295b78 100644
--- a/scripts/init.sh
+++ b/scripts/init.sh
@@ -77,7 +77,7 @@ rm -rf "$CRASHDIR"/starts/shellcrash.openrc
 command -v bash >/dev/null 2>&1 && shtype=bash
 [ -x /bin/ash ] && shtype=ash
 #批量授权
-for file in start.sh starts/bfstart.sh starts/afstart.sh starts/fw_stop.sh menu.sh menus/task_cmd.sh menus/bot_tg.sh; do
+for file in start.sh starts/bfstart.sh starts/afstart.sh starts/fw_stop.sh starts/fw_ipv6_watch.sh menu.sh menus/task_cmd.sh menus/bot_tg.sh; do
     sed -i "s|/bin/sh|/bin/$shtype|" "$CRASHDIR/$file" 2>/dev/null
     chmod +x "$CRASHDIR/$file" 2>/dev/null
 done
diff --git a/scripts/libs/set_cron.sh b/scripts/libs/set_cron.sh
index a586d1d2..11eb8d83 100644
--- a/scripts/libs/set_cron.sh
+++ b/scripts/libs/set_cron.sh
@@ -1,41 +1,95 @@
-
 crondir="$(crond -h 2>&1 | grep -oE 'Default:.*' | awk -F ":" '{print $2}'| tr -d ' ')"
 [ ! -w "$crondir" ] && crondir="/etc/storage/cron/crontabs"
 [ ! -w "$crondir" ] && crondir="/var/spool/cron/crontabs"
 [ ! -w "$crondir" ] && crondir="/var/spool/cron"
-[ -z "$USER" ] && USER=$(whoami 2>/dev/null)
+[ -z "$USER" ] && USER=$(id -un)
 [ -z "$TASKCFGDIR" ] && TASKCFGDIR="$CRASHDIR"/configs/task
-tmpcron=/tmp/cron_tmp
-touch "$tmpcron"
 
-cronadd() { #定时任务工具
-    if crontab -h 2>&1 | grep -q '\-l'; then
-        crontab "$1"
-    elif [ -w "$crondir" ];then
-        cat "$1" >"$crondir"/"$USER" && cru a REFRESH "0 0 1 1 * /bin/true" 2>/dev/null
-    else
-        echo "找不到可用的crond或者crontab应用！No available crond or crontab application can be found!"
-    fi
-}
-cronload() { #定时任务工具
-    if crontab -h 2>&1 | grep -q '\-l'; then
-        crontab -l
-    elif [ -f "$crondir/$USER" ];then
-        cat "$crondir"/"$USER" 2>/dev/null
-    else
+# ShellCrash 使用的 ash/bash（以及 dash）均支持 test -O。
+# shellcheck disable=SC3067
+croncheck() { #在任何写操作前检查实例管理权限，保留普通用户自己的安装
+    cron_uid=$(id -u) || return 1
+    [ "$cron_uid" = 0 ] && return 0
+    if [ ! -O "$CRASHDIR/configs/ShellCrash.cfg" ] || [ ! -w "$CRASHDIR/configs/ShellCrash.cfg" ]; then
+        echo '无权管理此 ShellCrash 实例，请使用安装用户或 root。' >&2
         return 1
     fi
+    for cron_pid in $(pidof CrashCore 2>/dev/null); do
+        if [ ! -O "/proc/$cron_pid" ]; then
+            echo '无权管理其他用户启动的 CrashCore。' >&2
+            return 1
+        fi
+    done
 }
-cronset() { #定时任务设置
-    # 参数1代表要移除的关键字,参数2代表要添加的任务语句
-    cronload | grep -v '^$' | grep -vF "$1" >"$tmpcron"
-    [ -n "$2" ] && echo "$2" >>"$tmpcron"
-    cronadd "$tmpcron"
-    #华硕/Padavan固件存档在本地,其他则删除
-    if [ -d /jffs ] || [ -d /etc/storage/ShellCrash ];then
-        mkdir -p "$TASKCFGDIR"
-        mv -f "$tmpcron" "$TASKCFGDIR"/cron
+
+cronadd() ( #定时任务工具；子 shell 隔离临时变量和清理 trap
+    croncheck || exit 1
+    [ -f "$1" ] && [ -r "$1" ] || exit 1
+    if crontab -h 2>&1 | grep -q '\-l'; then
+        crontab "$1"
+    elif [ -w "$crondir" ]; then
+        cron_user=$(id -un) || exit 1
+        cron_stage=$(mktemp "$crondir/.shellcrash.XXXXXX") || exit 1
+        trap 'rm -f "$cron_stage"' 0
+        trap 'exit 1' 1 2 3 15
+        [ ! -e "$crondir/$cron_user" ] || cp -p "$crondir/$cron_user" "$cron_stage" || exit 1
+        cat "$1" >"$cron_stage" && mv -f "$cron_stage" "$crondir/$cron_user" || exit 1
+        if command -v cru >/dev/null 2>&1; then
+            cru a REFRESH "0 0 1 1 * /bin/true"
+        fi
     else
-        rm -f "$tmpcron"
+        echo '找不到可用的 crond 或 crontab！No available crond or crontab!' >&2
+        exit 1
     fi
-}
+)
+
+cronload() (
+    cron_user=$(id -un) || exit 1
+    if crontab -h 2>&1 | grep -q '\-l'; then
+        cron_text=$(LC_ALL=C crontab -l 2>&1)
+        cron_status=$?
+        if [ "$cron_status" = 0 ]; then
+            [ -z "$cron_text" ] || printf '%s\n' "$cron_text"
+            exit 0
+        fi
+        #首次使用没有 crontab 是合法空表，其他错误必须传回调用者。
+        case "$cron_text" in
+            "no crontab for $cron_user" | "crontab: can't open '$cron_user': No such file or directory") exit 0 ;;
+        esac
+        printf '%s\n' "$cron_text" >&2
+        exit "$cron_status"
+    elif [ -d "$crondir" ] && [ -r "$crondir" ] && [ -x "$crondir" ]; then
+        [ -e "$crondir/$cron_user" ] || [ -L "$crondir/$cron_user" ] || exit 0
+        cat "$crondir/$cron_user"
+    else
+        echo '无法读取原有 crontab，已取消修改。' >&2
+        exit 1
+    fi
+)
+
+cronupdate() ( #成功读取、生成后才提交；参数是读取 stdin 的过滤命令
+    croncheck || exit 1
+    cron_tmp=$(mktemp -d /tmp/ShellCrash-cron.XXXXXX) || exit 1
+    cron_saved=
+    trap 'rm -rf "$cron_tmp"; [ -z "$cron_saved" ] || rm -f "$cron_saved"' 0
+    trap 'exit 1' 1 2 3 15
+    cronload >"$cron_tmp/old" || exit 1
+    "$@" <"$cron_tmp/old" >"$cron_tmp/new" || exit 1
+    #先准备华硕/Padavan 的持久化副本；任何提交前的写入失败都保留原表。
+    if [ "$cron_persist" = true ] && { [ -d /jffs ] || [ -d /etc/storage/ShellCrash ]; }; then
+        mkdir -p "$TASKCFGDIR" || exit 1
+        cron_saved=$(mktemp "$TASKCFGDIR/.cron.XXXXXX") || exit 1
+        cat "$cron_tmp/new" >"$cron_saved" || exit 1
+    fi
+    cronadd "$cron_tmp/new" || exit 1
+    [ -z "$cron_saved" ] || mv -f "$cron_saved" "$TASKCFGDIR/cron"
+)
+
+cronset() ( #参数1：移除的文字；参数2：新增任务。空结果也是合法 crontab。
+    cron_persist=true
+    # shellcheck disable=SC2016
+    CRON_KEY="$1" CRON_TASK="$2" cronupdate awk '
+        NF && !index($0, ENVIRON["CRON_KEY"]) { print }
+        END { if (ENVIRON["CRON_TASK"] != "") print ENVIRON["CRON_TASK"] }
+    '
+)
diff --git a/scripts/menus/5_task.sh b/scripts/menus/5_task.sh
index 5fb7f363..735773c6 100644
--- a/scripts/menus/5_task.sh
+++ b/scripts/menus/5_task.sh
@@ -23,7 +23,7 @@ set_cron() {
         "0) $TASK5_NO"
     read -r -p "$COMMON_INPUT> " res
     if [ "$res" = '1' ]; then
-        task_txt="$min $hour * * $week $CRASHDIR/task/task.sh $task_id $cron_time$task_name"
+        task_txt="$min $hour * * $week $CRASHDIR/task/task.sh $task_id \"$cron_time$task_name\""
         cronset "$cron_time$task_name" "$task_txt"
         msg_alert -t 0 "$TASK5_TASK_PREFIX$cron_time$task_name$TASK5_TASK_ADDED"
     fi
@@ -38,11 +38,11 @@ set_service() {
     [ -s "$task_file" ] && sed -i "/$3/d" "$task_file"
     # 运行时每分钟执行的任务特殊处理
     if [ "$1" = "running" ]; then
-        task_txt="$4 $CRASHDIR/task/task.sh $2 $3"
+        task_txt="$4 $CRASHDIR/task/task.sh $2 \"$3\""
         echo "$task_txt" >>"$task_file"
         [ -n "$(pidof CrashCore)" ] && cronset "$3" "$task_txt"
     else
-        echo "$CRASHDIR/task/task.sh $2 $3" >>"$task_file"
+        echo "$CRASHDIR/task/task.sh $2 \"$3\"" >>"$task_file"
     fi
     content_line "【$3】\033[32m$COMMON_SUCCESS\033[0m"
     sleep 1
@@ -144,11 +144,12 @@ task_del() {
     # 删除定时任务
     cronset "$1"
     # 删除条件任务
-    sed -i "/$1/d" "$TASKCFGDIR"/cron 2>/dev/null
-    sed -i "/$1/d" "$TASKCFGDIR"/bfstart 2>/dev/null
-    sed -i "/$1/d" "$TASKCFGDIR"/afstart 2>/dev/null
-    sed -i "/$1/d" "$TASKCFGDIR"/running 2>/dev/null
-    sed -i "/$1/d" "$TASKCFGDIR"/affirewall 2>/dev/null
+    [ -f "$TASKCFGDIR"/cron ] && sed -i "/$1/d" "$TASKCFGDIR"/cron 2>/dev/null
+    [ -f "$TASKCFGDIR"/bfstart ] && sed -i "/$1/d" "$TASKCFGDIR"/bfstart 2>/dev/null
+    [ -f "$TASKCFGDIR"/afstart ] && sed -i "/$1/d" "$TASKCFGDIR"/afstart 2>/dev/null
+    [ -f "$TASKCFGDIR"/running ] && sed -i "/$1/d" "$TASKCFGDIR"/running 2>/dev/null
+    [ -f "$TASKCFGDIR"/affirewall ] && sed -i "/$1/d" "$TASKCFGDIR"/affirewall 2>/dev/null
+    return 0
 }
 
 # 任务条件选择菜单
@@ -293,7 +294,10 @@ task_manager() {
                         break
                     fi
                 else
-                    task_des=$(echo "$task_txt" | awk '{print $2}')
+                    task_des=${task_txt#* }
+                    task_des=${task_des#"${task_des%%[! ]*}"}
+                    task_des=${task_des#\"}
+                    task_des=${task_des%\"}
                     task_name=$(cat "$CRASHDIR"/task/task_${i18n}.list "$TASKCFGDIR"/task.user 2>/dev/null | grep "$task_id" | awk -F '#' '{print $3}')
                     comp_box "$TASK5_CURRENT_TASK\033[36m$task_des\033[0m"
                     btm_box "1) $TASK5_EDIT_TASK" \
@@ -359,7 +363,7 @@ task_recom() {
         separator_line "="
         set_service running "106" "$TASK_RECOM_ITEM_1" "*/10 * * * *"
         set_service afstart "107" "$TASK_RECOM_ITEM_2"
-        cronset "$TASK_RECOM_ITEM_3" "0 3 * * * ${CRASHDIR}/task/task.sh 103 $TASK_RECOM_ITEM_3" &&
+        cronset "$TASK_RECOM_ITEM_3" "0 3 * * * ${CRASHDIR}/task/task.sh 103 \"$TASK_RECOM_ITEM_3\"" &&
             content_line "【$TASK_RECOM_ITEM_3】\033[32m$COMMON_SUCCESS\033[0m"
         separator_line "="
     }
diff --git a/scripts/start.sh b/scripts/start.sh
index 8fa387aa..f404de7d 100644
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -6,10 +6,11 @@
     cd $(dirname $0)
     pwd
 )
+. "$CRASHDIR"/libs/set_cron.sh
+croncheck || exit 1
 . "$CRASHDIR"/libs/get_config.sh
 #加载工具
 . "$CRASHDIR"/libs/set_config.sh
-. "$CRASHDIR"/libs/set_cron.sh
 . "$CRASHDIR"/libs/check_cmd.sh
 . "$CRASHDIR"/libs/check_autostart.sh
 . "$CRASHDIR"/libs/compare.sh
@@ -36,7 +37,9 @@ start_l(){
 case "$1" in
 
 start)
-    [ -n "$(pidof CrashCore)" ] && $0 stop #禁止多实例
+    if [ -n "$(pidof CrashCore)" ]; then #禁止多实例
+        "$0" stop || exit 1
+    fi
     stop_firewall                          #清理路由策略
     rm -f "$CRASHDIR"/\.start_error #移除自启失败标记
     #使用不同方式启动服务
@@ -69,9 +72,7 @@ stop)
     logger ShellCrash服务即将关闭......
     [ -n "$(pidof CrashCore)" ] && web_save #保存面板配置
     #清理定时任务
-    cronload | grep -vE '^$|start_legacy_wd.sh|运行时每' > "$TMPDIR"/cron_tmp
-    cronadd "$TMPDIR"/cron_tmp
-    rm -f "$TMPDIR"/cron_tmp
+    cronupdate awk 'NF && !/start_legacy_wd.sh|运行时每/' || exit 1
     #停止tg_bot
     . "$CRASHDIR"/menus/bot_tg_service.sh && bot_tg_stop
     #多种方式结束进程
@@ -96,8 +97,7 @@ stop)
     rm -rf "$TMPDIR"/CrashCore
     ;;
 restart)
-    $0 stop
-    $0 start
+    "$0" stop && "$0" start
     ;;
 init)
     . "$CRASHDIR"/starts/general_init.sh
@@ -110,7 +110,9 @@ daemon)
     fi
     ;;
 debug)
-    [ -n "$(pidof CrashCore)" ] && $0 stop >/dev/null #禁止多实例
+    if [ -n "$(pidof CrashCore)" ]; then #禁止多实例
+        "$0" stop >/dev/null || exit 1
+    fi
     stop_firewall >/dev/null                          #清理路由策略
     bfstart
     if [ -n "$2" ]; then
diff --git a/scripts/starts/afstart.sh b/scripts/starts/afstart.sh
index d798a517..27c8216c 100644
--- a/scripts/starts/afstart.sh
+++ b/scripts/starts/afstart.sh
@@ -7,11 +7,12 @@
 	cd ..
 	pwd
 )
+. "$CRASHDIR"/libs/set_cron.sh
+croncheck || exit 1
 . "$CRASHDIR"/libs/get_config.sh
 #加载工具
 . "$CRASHDIR"/libs/check_cmd.sh
 . "$CRASHDIR"/libs/logger.sh
-. "$CRASHDIR"/libs/set_cron.sh
 #缺省值
 [ -z "$firewall_area" ] && firewall_area=1
 #延迟启动
@@ -37,14 +38,24 @@ if [ -n "$test" -o -n "$(pidof CrashCore)" ]; then
 	} &
 	ckcmd mtd_storage.sh && mtd_storage.sh save >/dev/null 2>&1 #Padavan保存/etc/storage
 	#加载定时任务
-	cronload | grep -v '^$' >"$TMPDIR"/cron_tmp
-	[ -s "$TASKCFGDIR"/cron ] && cat "$TASKCFGDIR"/cron >>"$TMPDIR"/cron_tmp
-	[ -s "$TASKCFGDIR"/running ] && cat "$TASKCFGDIR"/running >>"$TMPDIR"/cron_tmp
-	[ "$bot_tg_service" = ON ] && echo "* * * * * /bin/sh $CRASHDIR/starts/start_legacy_wd.sh bot_tg #ShellCrash-TG_BOT守护进程" >>"$TMPDIR"/cron_tmp
-	[ "$start_old" = ON ] && echo "* * * * * /bin/sh $CRASHDIR/starts/start_legacy_wd.sh shellcrash #ShellCrash保守模式守护进程" >>"$TMPDIR"/cron_tmp
-	awk '!x[$0]++' "$TMPDIR"/cron_tmp >"$TMPDIR"/cron_tmp2 #删除重复行
-	cronadd "$TMPDIR"/cron_tmp2
-	rm -f "$TMPDIR"/cron_tmp "$TMPDIR"/cron_tmp2
+	set -- -
+	for cron_file in "$TASKCFGDIR/cron" "$TASKCFGDIR/running"; do
+		[ ! -e "$cron_file" ] || set -- "$@" "$cron_file"
+	done
+	# shellcheck disable=SC2016
+	CRON_BOT="$bot_tg_service" CRON_LEGACY="$start_old" CRON_DIR="$CRASHDIR" cronupdate awk '
+		NF && !seen[$0]++ { print }
+		END {
+			if (ENVIRON["CRON_BOT"] == "ON") {
+				line = "* * * * * /bin/sh " ENVIRON["CRON_DIR"] "/starts/start_legacy_wd.sh bot_tg #ShellCrash-TG_BOT守护进程"
+				if (!seen[line]++) print line
+			}
+			if (ENVIRON["CRON_LEGACY"] == "ON") {
+				line = "* * * * * /bin/sh " ENVIRON["CRON_DIR"] "/starts/start_legacy_wd.sh shellcrash #ShellCrash保守模式守护进程"
+				if (!seen[line]++) print line
+			}
+		}
+	' "$@" || exit 1
 	#加载条件任务
 	[ -s "$TASKCFGDIR"/afstart ] && { . "$TASKCFGDIR"/afstart; } &
 	[ -s "$TASKCFGDIR"/affirewall -a -s /etc/init.d/firewall -a ! -f /etc/init.d/firewall.bak ] && {
diff --git a/scripts/starts/clash_modify.sh b/scripts/starts/clash_modify.sh
index b67a0330..f2b8439f 100644
--- a/scripts/starts/clash_modify.sh
+++ b/scripts/starts/clash_modify.sh
@@ -7,7 +7,7 @@ prepare_clash_base_config() {
     external="external-controller: 0.0.0.0:$db_port"
     if [ "$redir_mod" = "Mix" -o "$redir_mod" = "Tun" ]; then
         [ "$crashcore" = 'meta' ] && tun_meta=', device: utun, auto-route: false, auto-detect-interface: false'
-        tun="tun: {enable: true, stack: system$tun_meta}"
+        tun="tun: {enable: true, stack: mips$tun_meta}"
     else
         tun='tun: {enable: false}'
     fi
@@ -216,6 +216,25 @@ add_custom_inbounds_and_rules() {
     }
 }
 
+preserve_geodata_yaml() {
+    #保留订阅规则依赖的Geo数据设置，本地自定义同名配置优先
+    : >"$TMPDIR"/geodata_base.yaml
+    : >"$TMPDIR"/geodata.yaml
+    for char in geodata-mode geodata-loader geosite-matcher geo-auto-update geo-update-interval geox-url; do
+        awk -v key="$char" '
+            /^[^[:space:]#]/ { emit = ($0 ~ ("^" key ":")) }
+            emit { print }
+        ' "$core_config" >>"$TMPDIR"/geodata_base.yaml
+    done
+    for char in geodata-mode geodata-loader geosite-matcher geo-auto-update geo-update-interval geox-url; do
+        grep -qE "^$char:" "$CRASHDIR"/yamls/user.yaml "$CRASHDIR"/yamls/others.yaml 2>/dev/null && continue
+        awk -v key="$char" '
+            /^[^[:space:]#]/ { emit = ($0 ~ ("^" key ":")) }
+            emit { print }
+        ' "$TMPDIR"/geodata_base.yaml >>"$TMPDIR"/geodata.yaml
+    done
+}
+
 merger_yaml() {
     #mix和route模式生成rule-providers
     [ "$dns_mod" = "mix" ] || [ "$dns_mod" = "route" ] && ! grep -Eq '^[[:space:]]*cn:' "$TMPDIR"/rule-providers.yaml && ! grep -q '^rule-providers' "$CRASHDIR"/yamls/others.yaml 2>/dev/null && {
@@ -244,8 +263,9 @@ merger_yaml() {
             yaml_add="$yaml_add $TMPDIR/${char}.yaml"
         }
     done
+    preserve_geodata_yaml
     #合并完整配置文件
-    cut -c 1- "$TMPDIR"/set.yaml $yaml_dns $yaml_hosts $yaml_user $yaml_others $yaml_add >"$TMPDIR"/config.yaml
+    cut -c 1- "$TMPDIR"/set.yaml "$TMPDIR"/geodata.yaml $yaml_dns $yaml_hosts $yaml_user $yaml_others $yaml_add >"$TMPDIR"/config.yaml
 }
 
 test_yaml() {
@@ -259,7 +279,7 @@ test_yaml() {
         sed -i "/#自定义策略组开始/,/#自定义策略组结束/d" "$TMPDIR"/proxy-groups.yaml
         mv -f "$TMPDIR"/set_bak.yaml "$TMPDIR"/set.yaml >/dev/null 2>&1
         #合并基础配置文件
-        cut -c 1- "$TMPDIR"/set.yaml $yaml_dns $yaml_add >"$TMPDIR"/config.yaml
+        cut -c 1- "$TMPDIR"/set.yaml "$TMPDIR"/geodata_base.yaml $yaml_dns $yaml_add >"$TMPDIR"/config.yaml
         sed -i "/#自定义/d" "$TMPDIR"/config.yaml
     fi
 }
@@ -268,7 +288,7 @@ finalize_clash_yaml() {
     #建立软连接
     [ ""$TMPDIR"" = ""$BINDIR"" ] || ln -sf "$TMPDIR"/config.yaml "$BINDIR"/config.yaml 2>/dev/null || cp -f "$TMPDIR"/config.yaml "$BINDIR"/config.yaml
     #清理缓存
-    for char in $yaml_char set set_bak dns hosts; do
+    for char in $yaml_char set set_bak dns hosts geodata geodata_base; do
         rm -f "$TMPDIR"/${char}.yaml
     done
 }
diff --git a/scripts/starts/fw_getlanip.sh b/scripts/starts/fw_getlanip.sh
index 2d9e3a39..d5812e49 100644
--- a/scripts/starts/fw_getlanip.sh
+++ b/scripts/starts/fw_getlanip.sh
@@ -1,34 +1,171 @@
+ipv6_route_prefixes() {
+    awk '
+    function is_global_prefix(value) {
+        return value ~ /^[23][0-9A-Fa-f]*:/ && value ~ /\/[0-9]+$/
+    }
+    $1 == "default" {
+        for (i = 1; i < NF; i++) {
+            if ($i == "from" && is_global_prefix($(i + 1)))
+                print $(i + 1)
+        }
+        next
+    }
+    is_global_prefix($1) {
+        via = 0
+        for (i = 1; i <= NF; i++) {
+            if ($i == "via")
+                via = 1
+        }
+        if (!via)
+            print $1
+    }'
+}
+
+get_lan_ifaces() {
+    ip route show scope link 2>/dev/null |
+        grep -Ev 'default|ppp|wan|utun|iot|peer|docker|podman|virbr|vnet|ovs|vmbr|veth|vmnic|vboxnet|lxcbr|xenbr|vEthernet|wgs|multicast|anycast' |
+        awk '{for(i=1;i<=NF;i++) if($i=="dev") {print $(i+1); break}}' |
+        grep -v '^lo$' |
+        sort -u
+}
+
+get_openwrt_lan_ifaces() {
+    if command -v ubus >/dev/null 2>&1; then
+        ubus -S call network.interface.lan status 2>/dev/null |
+            awk -F '"' '$2 == "l3_device" {print $4}'
+    fi
+    printf '%s\n' $lan_ifaces
+}
+
+get_ipv6_prefixes_openwrt() {
+    ipv6_prefixes=$(
+        for ipv6_iface in $(get_openwrt_lan_ifaces | sort -u); do
+            ip -6 route show dev "$ipv6_iface" 2>/dev/null |
+                grep -v '^default' |
+                ipv6_route_prefixes
+        done
+    )
+    # Some OpenWrt variants do not expose the LAN route through BusyBox ip.
+    # In that case, use netifd's source-specific default route as a fallback.
+    [ -n "$ipv6_prefixes" ] || ipv6_prefixes=$(
+        ip -6 route show default 2>/dev/null | ipv6_route_prefixes
+    )
+    printf '%s\n' "$ipv6_prefixes" | sort -u
+}
+
+get_ipv6_prefixes_linux() {
+    ipv6_prefixes=$(
+        for ipv6_iface in $lan_ifaces; do
+            ip -6 route show dev "$ipv6_iface" 2>/dev/null | grep -v '^default'
+        done | ipv6_route_prefixes | sort -u
+    )
+    # A host may use one interface for both its uplink and LAN, or may not
+    # have an IPv4 LAN route. Fall back to directly connected global routes.
+    [ -n "$ipv6_prefixes" ] || ipv6_prefixes=$(
+        ip -6 route show 2>/dev/null |
+            grep -Ev 'unreachable|prohibit|blackhole|ppp|wan|utun|iot|peer|docker|podman|virbr|vnet|ovs|vmbr|veth|vmnic|vboxnet|lxcbr|xenbr|vEthernet|wgs|multicast|anycast' |
+            ipv6_route_prefixes |
+            sort -u
+    )
+    printf '%s\n' "$ipv6_prefixes"
+}
+
+get_ipv6_prefixes_router() {
+    # Padavan/Asuswrt and other BusyBox based firmware do not consistently
+    # expose route protocol metadata. Only depend on route shape and devices.
+    ipv6_prefixes=$(
+        for ipv6_iface in $lan_ifaces; do
+            ip -6 route show dev "$ipv6_iface" 2>/dev/null |
+                grep -v '^default' |
+                ipv6_route_prefixes
+        done
+    )
+    [ -n "$ipv6_prefixes" ] || ipv6_prefixes=$(
+        ip -6 route show default 2>/dev/null | ipv6_route_prefixes
+    )
+    printf '%s\n' "$ipv6_prefixes" | sort -u
+}
+
+get_ipv6_prefixes_fallback() {
+    # Generic fallback for systems unknown to ShellCrash. Avoid fixed field
+    # positions and route protocol names, which differ across ip variants.
+    ip -6 route show 2>/dev/null | ipv6_route_prefixes | sort -u
+}
+
+get_ipv6_platform() {
+    case "$systype" in
+    mi_snapshot | ng_snapshot)
+        echo openwrt
+        return
+        ;;
+    Padavan | asusrouter)
+        echo router
+        return
+        ;;
+    container)
+        echo linux
+        return
+        ;;
+    esac
+
+    if [ -f /etc/openwrt_release ] || { [ -f /etc/rc.common ] && command -v uci >/dev/null 2>&1; }; then
+        echo openwrt
+    elif [ "$(uname -s 2>/dev/null)" = Linux ]; then
+        echo linux
+    else
+        echo fallback
+    fi
+}
+
+get_ipv6_prefixes() {
+    [ -n "$lan_ifaces" ] || lan_ifaces=$(get_lan_ifaces)
+    case "$(get_ipv6_platform)" in
+    openwrt) get_ipv6_prefixes_openwrt ;;
+    router) get_ipv6_prefixes_router ;;
+    linux) get_ipv6_prefixes_linux ;;
+    *) get_ipv6_prefixes_fallback ;;
+    esac
+}
+
+build_host_ipv6() {
+    host_ipv6="fe80::/10 fd00::/8 $1"
+    [ "$ts_service" = ON ] && host_ipv6="$host_ipv6 fd7a:115c:a1e0::/48"
+    if [ "$wg_service" = ON ]; then
+        [ -f "$CRASHDIR"/configs/gateway.cfg ] && . "$CRASHDIR"/configs/gateway.cfg
+        [ -n "$wg_ipv6" ] && host_ipv6="$host_ipv6 $wg_ipv6"
+    fi
+    # Only pass prefix-shaped values to firewall generators and keep the
+    # result stable so the watcher can compare it cheaply.
+    host_ipv6=$(printf '%s\n' "$host_ipv6" |
+        tr ' ' '\n' |
+        awk '/^[0-9A-Fa-f:]+\/[0-9]+$/ {print}' |
+        sort -u |
+        tr '\n' ' ' |
+        sed 's/ $//')
+}
+
 getlanip() { #获取局域网host地址
     i=1
     while [ "$i" -le "20" ]; do
         #ipv4局域网网段
         host_ipv4=$(ip route show scope link | grep -Ev 'default|wan|utun|iot|peer|docker|podman|virbr|vnet|ovs|vmbr|veth|vmnic|vboxnet|lxcbr|xenbr|vEthernet|wgs|multicast|anycast' | awk '{print $1}')
-        #ipv6局域网网段 - 从IPv4已识别的LAN接口获取全局IPv6前缀
-        [ "$ipv6_redir" = "ON" ] && {
-            lan_ifaces=$(ip route show scope link | grep -Ev 'ppp|wan|utun|iot|peer|docker|podman|virbr|vnet|ovs|vmbr|veth|vmnic|vboxnet|lxcbr|xenbr|vEthernet|wgs|multicast|anycast' | awk '{for(i=1;i<=NF;i++) if($i=="dev") {print $(i+1); break}}' | grep -v '^lo$' | sort -u)
-            host_ipv6=$(
-                for iface in $lan_ifaces; do
-                    ip -6 addr show dev $iface 2>/dev/null
-                done | grep 'scope global' | awk '{print $2}' | tr '\n' ' ' | sed 's/ $//'
-            )
-			[ -z "$host_ipv6" ] && host_ipv6=$(ip -6 route show | grep -Ev 'default|unreachable|fe80::/|wan|ppp|utun|iot|peer|docker|podman|virbr|vnet|ovs|vmbr|veth|vmnic|vboxnet|lxcbr|xenbr|vEthernet|wgs|multicast|anycast' | awk '{print $1}' | tr '\n' ' ' | sed 's/ $//')
-        }
+        #ipv6局域网网段
+        if [ "$ipv6_redir" = "ON" ]; then
+            lan_ifaces=$(get_lan_ifaces)
+            detected_host_ipv6=$(get_ipv6_prefixes)
+        fi
         [ -f "$TMPDIR"/ShellCrash.log ] && break
-        [ -n "$host_ipv4" -a "$ipv6_redir" != "ON" ] && break
-        [ -n "$host_ipv4" -a -n "$host_ipv6" ] && break
+        [ -n "$host_ipv4" ] && [ "$ipv6_redir" != "ON" ] && break
+        [ -n "$host_ipv4" ] && [ -n "$detected_host_ipv6" ] && break
         sleep 1 && i=$((i + 1))
     done
     #Tailscale
-    [ "$ts_service" = ON ] && {
-        ts_host_ipv4=' 100.64.0.0/10'
-        ts_host_ipv6=' fd7a:115c:a1e0::/48'
-    }
+    [ "$ts_service" = ON ] && ts_host_ipv4=' 100.64.0.0/10'
     #Wireguard
-    [ "$wg_service" = ON ] && {
+    if [ "$wg_service" = ON ]; then
         . "$CRASHDIR"/configs/gateway.cfg
-        wg_host_ipv4=' $wg_ipv4'
-        [ -n "$wg_ipv6" ] && wg_host_ipv6=' $wg_ipv6'
-    }
+        wg_host_ipv4=" $wg_ipv4"
+    fi
     #添加自定义ipv4局域网网段
     if [ "$replace_default_host_ipv4" = "ON" ]; then
         host_ipv4="$cust_host_ipv4"
@@ -40,7 +177,7 @@ getlanip() { #获取局域网host地址
         host_ipv4='192.168.0.0/16 10.0.0.0/12 172.16.0.0/12'
         logger "无法获取本地LAN-IPV4网段，请前往流量过滤设置界面设置自定义网段！" 31
     }
-    host_ipv6="fe80::/10 fd00::/8 $host_ipv6$ts_host_ipv6$wg_host_ipv6"
+    build_host_ipv6 "$detected_host_ipv6"
     #获取本机出口IP地址
     local_ipv4=$(ip route 2>&1 | grep -Ev 'utun|iot|docker|linkdown' | grep -Eo 'src.*' | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | sort -u)
     [ -z "$local_ipv4" ] && local_ipv4=$(ip route 2>&1 | grep -Eo 'src.*' | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | sort -u)
diff --git a/scripts/starts/fw_ipv6_watch.sh b/scripts/starts/fw_ipv6_watch.sh
new file mode 100755
index 00000000..dd66ee92
--- /dev/null
+++ b/scripts/starts/fw_ipv6_watch.sh
@@ -0,0 +1,123 @@
+#!/bin/sh
+# Keep the nftables LAN IPv6 prefix set in sync with dynamic prefixes.
+
+[ -z "$CRASHDIR" ] && CRASHDIR=$(
+    cd "$(dirname "$0")"
+    cd ..
+    pwd
+)
+. "$CRASHDIR"/libs/get_config.sh
+. "$CRASHDIR"/starts/fw_getlanip.sh
+
+[ -z "$TMPDIR" ] && TMPDIR=/tmp/ShellCrash
+ipv6_watch_pid="$TMPDIR/ipv6_watch.pid"
+ipv6_watch_fifo="$TMPDIR/ipv6_route_monitor.$$"
+ipv6_nft_family=${SHELLCRASH_NFT_FAMILY:-inet}
+ipv6_nft_table=${SHELLCRASH_NFT_TABLE:-shellcrash}
+ipv6_nft_set=${SHELLCRASH_IPV6_SET:-lan_ip6}
+
+stop_ipv6_watch() {
+    [ -s "$ipv6_watch_pid" ] || return 0
+    ipv6_watch_old_pid=$(cat "$ipv6_watch_pid" 2>/dev/null)
+    case "$ipv6_watch_old_pid" in
+    '' | *[!0-9]*) ;;
+    *)
+        if [ ! -r "/proc/$ipv6_watch_old_pid/cmdline" ] ||
+            tr '\0' ' ' <"/proc/$ipv6_watch_old_pid/cmdline" 2>/dev/null | grep -q 'fw_ipv6_watch.sh'; then
+            kill "$ipv6_watch_old_pid" 2>/dev/null
+        fi
+        ;;
+    esac
+    rm -f "$ipv6_watch_pid"
+}
+
+cleanup_ipv6_watch() {
+    trap - EXIT INT TERM
+    [ -n "$ipv6_monitor_pid" ] && kill "$ipv6_monitor_pid" 2>/dev/null
+    [ -p "$ipv6_watch_fifo" ] && rm -f "$ipv6_watch_fifo"
+    if [ "$(cat "$ipv6_watch_pid" 2>/dev/null)" = "$$" ]; then
+        rm -f "$ipv6_watch_pid"
+    fi
+    exit 0
+}
+
+update_ipv6_set() {
+    lan_ifaces=$(get_lan_ifaces)
+    detected_host_ipv6=$(get_ipv6_prefixes)
+    build_host_ipv6 "$detected_host_ipv6"
+    ipv6_watch_state="$host_ipv6"
+
+    if [ "$ipv6_watch_state" = "$ipv6_watch_last_state" ] &&
+        nft list set "$ipv6_nft_family" "$ipv6_nft_table" "$ipv6_nft_set" >/dev/null 2>&1; then
+        return 0
+    fi
+
+    ipv6_watch_elements=$(echo "$host_ipv6" | sed 's/[[:space:]]\+/, /g')
+    [ -n "$ipv6_watch_elements" ] || return 1
+    nft list set "$ipv6_nft_family" "$ipv6_nft_table" "$ipv6_nft_set" >/dev/null 2>&1 || return 1
+
+    # nft processes a batch atomically, so packets never observe a partially
+    # updated set while an ISP prefix is being replaced.
+    printf 'flush set %s %s %s\nadd element %s %s %s { %s }\n' \
+        "$ipv6_nft_family" "$ipv6_nft_table" "$ipv6_nft_set" \
+        "$ipv6_nft_family" "$ipv6_nft_table" "$ipv6_nft_set" "$ipv6_watch_elements" |
+        nft -f - >/dev/null 2>&1 || return 1
+    ipv6_watch_last_state="$ipv6_watch_state"
+}
+
+run_iproute2_monitor() {
+    rm -f "$ipv6_watch_fifo"
+    mkfifo "$ipv6_watch_fifo" 2>/dev/null || return 1
+    ip -6 monitor route >"$ipv6_watch_fifo" 2>/dev/null &
+    ipv6_monitor_pid=$!
+    while IFS= read -r _ipv6_route_event; do
+        # Coalesce delete/add notifications emitted during renumbering.
+        sleep 1
+        update_ipv6_set
+    done <"$ipv6_watch_fifo"
+    wait "$ipv6_monitor_pid" 2>/dev/null
+    ipv6_monitor_pid=
+    rm -f "$ipv6_watch_fifo"
+    return 1
+}
+
+run_ipv6_watch() {
+    mkdir -p "$TMPDIR"
+    echo $$ >"$ipv6_watch_pid"
+    trap cleanup_ipv6_watch EXIT INT TERM
+    ipv6_watch_last_state=
+    update_ipv6_set
+
+    # Full iproute2 has event monitoring. BusyBox/router variants that do not
+    # support it use a small polling fallback instead.
+    if ip -Version 2>&1 | grep -qi 'iproute2'; then
+        run_iproute2_monitor
+    fi
+    while :; do
+        sleep 30
+        update_ipv6_set
+    done
+}
+
+case "$1" in
+start)
+    mkdir -p "$TMPDIR"
+    stop_ipv6_watch
+    /bin/sh "$0" run >/dev/null 2>&1 &
+    echo $! >"$ipv6_watch_pid"
+    ;;
+stop)
+    stop_ipv6_watch
+    ;;
+run)
+    run_ipv6_watch
+    ;;
+once)
+    ipv6_watch_last_state=
+    update_ipv6_set
+    ;;
+*)
+    echo "Usage: $0 {start|stop|run|once}" >&2
+    exit 1
+    ;;
+esac
diff --git a/scripts/starts/fw_nftables.sh b/scripts/starts/fw_nftables.sh
index c1d5e2c9..66cd831e 100644
--- a/scripts/starts/fw_nftables.sh
+++ b/scripts/starts/fw_nftables.sh
@@ -2,13 +2,22 @@
 # Copyright (C) Juewuy
 
 RESERVED_IP=$(echo $reserve_ipv4 | sed 's/[[:space:]]\+/, /g')
-RESERVED_IP6=$(echo "$reserve_ipv6 $host_ipv6" | sed 's/[[:space:]]\+/, /g')
+RESERVED_IP6=$(echo "$reserve_ipv6" | sed 's/[[:space:]]\+/, /g')
+
+start_nft_ipv6_set() {
+    HOST_IP6=$(echo "$host_ipv6" | sed 's/[[:space:]]\+/, /g')
+    nft list set inet shellcrash lan_ip6 >/dev/null 2>&1 ||
+        nft add set inet shellcrash lan_ip6 { type ipv6_addr \; flags interval \; auto-merge \; }
+    nft flush set inet shellcrash lan_ip6 2>/dev/null
+    [ -n "$HOST_IP6" ] && nft add element inet shellcrash lan_ip6 { $HOST_IP6 }
+}
 
 add_ip6_route(){
-    #过滤保留地址及本机地址
+    #过滤保留地址及当前局域网地址
     nft add rule inet shellcrash $1 ip6 daddr {$RESERVED_IP6} return
-    #仅代理本机局域网网段流量
-    nft add rule inet shellcrash $1 ip6 saddr != {$HOST_IP6} return
+    nft add rule inet shellcrash $1 ip6 daddr @lan_ip6 return
+    #OUTPUT只包含本机流量，无需依赖动态公网源前缀
+    [ "$1" = 'prerouting' ] && nft add rule inet shellcrash $1 ip6 saddr != @lan_ip6 return
     #绕过CN_IPV6
     [ "$dns_mod" != "fake-ip" -a "$cn_ip_route" = "ON" -a -f "$BINDIR"/cn_ipv6.txt ] && {
         CN_IP6=$(awk '{printf "%s, ",$1}' "$BINDIR"/cn_ipv6.txt)
@@ -83,10 +92,8 @@ start_nft_route() { #nftables-route通用工具
     }
     #局域网ipv6支持
     if [ "$ipv6_redir" = "ON" -a "$1" = 'prerouting' -a "$firewall_area" != 5 ]; then
-        HOST_IP6=$(echo $host_ipv6 | sed 's/[[:space:]]\+/, /g')
         add_ip6_route "$1"
     elif [ "$ipv6_redir" = "ON" -a "$1" = 'output' -a \( "$firewall_area" = 2 -o "$firewall_area" = 3 \) ]; then
-        HOST_IP6="::1, $(echo $host_ipv6 | sed 's/[[:space:]]\+/, /g')"
         add_ip6_route "$1"
     else
         nft add rule inet shellcrash $1 meta nfproto ipv6 return
@@ -106,7 +113,6 @@ start_nft_route() { #nftables-route通用工具
 start_nft_dns() { #nftables-dns
     [ "$1" = 'prerouting' ] && {
         HOST_IP=$(echo $host_ipv4 | sed 's/[[:space:]]\+/, /g')
-        HOST_IP6=$(echo $host_ipv6 | sed 's/[[:space:]]\+/, /g')
     }
     [ "$1" = 'output' ] && HOST_IP="127.0.0.0/8, $(echo $local_ipv4 | sed 's/[[:space:]]\+/, /g')"
     [ "$1" = 'prerouting_vm' ] && HOST_IP="$(echo $vm_ipv4 | sed 's/[[:space:]]\+/, /g')"
@@ -119,7 +125,7 @@ start_nft_dns() { #nftables-dns
     nft add rule inet shellcrash "$1"_dns meta skgid { 453, 7890 } return
     [ "$firewall_area" = 5 ] && nft add rule inet shellcrash "$1"_dns ip saddr $bypass_host return
     nft add rule inet shellcrash "$1"_dns ip saddr != {$HOST_IP} return                              #屏蔽外部请求
-    [ "$1" = 'prerouting' ] && nft add rule inet shellcrash "$1"_dns ip6 saddr != {$HOST_IP6} return #屏蔽外部请求
+    [ "$1" = 'prerouting' ] && nft add rule inet shellcrash "$1"_dns ip6 saddr != @lan_ip6 return #屏蔽外部请求
     #过滤局域网设备
     [ "$1" = 'prerouting' ] && [ -s "$CRASHDIR"/configs/mac ] && {
         MAC=$(awk '{printf "%s, ",$1}' "$CRASHDIR"/configs/mac)
@@ -134,7 +140,6 @@ start_nft_dns() { #nftables-dns
 }
 start_nft_wan() { #nftables公网防火墙
     HOST_IP=$(echo $host_ipv4 | sed 's/[[:space:]]\+/, /g')
-    HOST_IP6=$(echo $host_ipv6 | sed 's/[[:space:]]\+/, /g')
     nft add chain inet shellcrash input { type filter hook input priority -100 \; }
     nft add rule inet shellcrash input iif lo accept #本机请求全放行
     #端口放行
@@ -148,7 +153,7 @@ start_nft_wan() { #nftables公网防火墙
     #端口拦截
     reject_ports="{ $mix_port, $db_port }"
     nft add rule inet shellcrash input ip saddr {$HOST_IP} accept
-    nft add rule inet shellcrash input ip6 saddr {$HOST_IP6} accept
+    nft add rule inet shellcrash input ip6 saddr @lan_ip6 accept
     nft add rule inet shellcrash input tcp dport $reject_ports reject
     nft add rule inet shellcrash input udp dport $reject_ports reject
     #fw4特殊处理
@@ -160,6 +165,7 @@ start_nftables() { #nftables配置总入口
     #初始化nftables
     nft add table inet shellcrash 2>/dev/null
     nft flush table inet shellcrash 2>/dev/null
+    start_nft_ipv6_set
     #公网访问防火墙
     [ "$fw_wan" != OFF ] && [ "$systype" != 'container' ] && start_nft_wan
     #启动DNS劫持
diff --git a/scripts/starts/fw_start.sh b/scripts/starts/fw_start.sh
index 6a6927ab..c81a9c05 100644
--- a/scripts/starts/fw_start.sh
+++ b/scripts/starts/fw_start.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 # Copyright (C) Juewuy
 
+#停止旧的IPv6前缀监听，避免防火墙重建期间并发更新
+[ -f "$CRASHDIR"/starts/fw_ipv6_watch.sh ] && /bin/sh "$CRASHDIR"/starts/fw_ipv6_watch.sh stop
 #获取局域网host地址
 . "$CRASHDIR"/starts/fw_getlanip.sh && getlanip
 #缺省值
@@ -46,6 +48,9 @@
 #防火墙配置
 [ "$firewall_mod" = 'iptables' ] && . "$CRASHDIR"/starts/fw_iptables.sh && start_iptables
 [ "$firewall_mod" = 'nftables' ] && . "$CRASHDIR"/starts/fw_nftables.sh && start_nftables
+#动态更新nftables中的IPv6局域网前缀集合
+[ "$firewall_mod" = 'nftables' -a "$ipv6_redir" = "ON" ] &&
+    /bin/sh "$CRASHDIR"/starts/fw_ipv6_watch.sh start
 #修复部分虚拟机dns查询失败的问题
 [ "$firewall_area" = 2 -o "$firewall_area" = 3 ] && [ -z "$(grep '127.0.0.1' /etc/resolv.conf 2>/dev/null)" ] && [ "$systype" != 'container' ] && {
     line=$(grep -n 'nameserver' /etc/resolv.conf | awk -F: 'FNR==1{print $1}')
diff --git a/scripts/starts/fw_stop.sh b/scripts/starts/fw_stop.sh
index 2a5d99c6..354f138d 100644
--- a/scripts/starts/fw_stop.sh
+++ b/scripts/starts/fw_stop.sh
@@ -5,6 +5,8 @@
 [ -z "$CRASHDIR" ] && CRASHDIR=$( cd $(dirname $0);cd ..;pwd)
 . "$CRASHDIR"/libs/get_config.sh
 . "$CRASHDIR"/libs/check_cmd.sh
+#停止IPv6前缀监听
+[ -f "$CRASHDIR"/starts/fw_ipv6_watch.sh ] && /bin/sh "$CRASHDIR"/starts/fw_ipv6_watch.sh stop
 . "$CRASHDIR"/starts/fw_getlanip.sh && getlanip #获取局域网host地址
 #缺省值
 [ -z "$common_ports" ] && common_ports='ON'
@@ -172,4 +174,3 @@ ckcmd nft && nft delete table inet shellcrash >/dev/null 2>&1
 [ -s /etc/init.d/firewall.bak ] && mv -f /etc/init.d/firewall.bak /etc/init.d/firewall
 #others
 sed -i '/shellcrash-dns-repair/d' /etc/resolv.conf 2>/dev/null
-
diff --git a/scripts/starts/snapshot_init.sh b/scripts/starts/snapshot_init.sh
index 9445b7cf..514c6aa6 100644
--- a/scripts/starts/snapshot_init.sh
+++ b/scripts/starts/snapshot_init.sh
@@ -4,7 +4,6 @@
 CRASHDIR="$(uci get firewall.ShellCrash.path | sed 's/\/starts.*//')"
 #防止提前自启
 /etc/init.d/shellcrash disable
-crontab -l | grep -v 'start_legacy_wd.sh shellcrash' | crontab -
 #防止usb未加载
 i=0
 while [ ! -f "$CRASHDIR/configs/ShellCrash.cfg" ]; do
@@ -13,6 +12,8 @@ while [ ! -f "$CRASHDIR/configs/ShellCrash.cfg" ]; do
     sleep 3
 done
 . "$CRASHDIR"/configs/ShellCrash.cfg
+. "$CRASHDIR"/libs/set_cron.sh
+cronset 'start_legacy_wd.sh shellcrash' || exit 1
 
 autoSSH() {
     #自动开启SSH
diff --git a/tests/clash_geodata.sh b/tests/clash_geodata.sh
new file mode 100644
index 00000000..98ddda98
--- /dev/null
+++ b/tests/clash_geodata.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+# Run with sh tests/clash_geodata.sh [path/to/clash_modify.sh].
+set -e
+script=${1:-$(dirname "$0")/../scripts/starts/clash_modify.sh}
+. "$script"
+test_dir=$(mktemp -d)
+trap 'rm -rf "$test_dir"' EXIT HUP INT TERM
+
+setup() {
+    CRASHDIR="$test_dir/$1"
+    TMPDIR="$CRASHDIR/tmp"
+    BINDIR="$CRASHDIR/bin"
+    mkdir -p "$CRASHDIR/yamls" "$TMPDIR" "$BINDIR"
+    core_config="$CRASHDIR/yamls/config.yaml"
+    dns_mod=redir_host
+    yaml_char='rules proxy-groups'
+    yaml_user= yaml_others= yaml_dns= yaml_hosts=
+    printf 'mode: Rule\n' >"$TMPDIR/set.yaml"
+    printf ' - GEOSITE,GOOGLE,DIRECT\n' >"$TMPDIR/rules.yaml"
+    : >"$TMPDIR/proxy-groups.yaml"
+    cat >"$core_config" <<'EOF'
+geodata-mode: true
+geodata-loader: memconservative
+geosite-matcher: succinct
+geo-auto-update: true
+geo-update-interval: 24
+geox-url:
+  geoip: https://example.invalid/geoip.dat
+  geosite: >-
+    https://example.invalid/geosite.dat
+  mmdb: https://example.invalid/Country.mmdb
+rules:
+ - GEOSITE,GOOGLE,DIRECT
+mixed-port: 1234
+EOF
+}
+
+assert_line() {
+    grep -qFx -- "$1" "$TMPDIR/config.yaml" || {
+        echo "Missing expected line: $1" >&2
+        exit 1
+    }
+}
+
+setup inherited
+merger_yaml
+assert_line 'geodata-mode: true'
+assert_line 'geodata-loader: memconservative'
+assert_line 'geosite-matcher: succinct'
+assert_line 'geo-auto-update: true'
+assert_line 'geo-update-interval: 24'
+assert_line '    https://example.invalid/geosite.dat'
+[ "$(grep -c '^rules:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q '^mixed-port: 1234' "$TMPDIR/config.yaml"
+finalize_clash_yaml
+[ ! -e "$TMPDIR/geodata.yaml" ]
+[ ! -e "$TMPDIR/geodata_base.yaml" ]
+
+setup overrides
+printf 'geodata-mode: false\n' >"$CRASHDIR/yamls/user.yaml"
+printf 'geox-url: {geosite: https://override.invalid/geosite.dat}\n' >"$CRASHDIR/yamls/others.yaml"
+merger_yaml
+assert_line 'geodata-mode: false'
+assert_line 'geox-url: {geosite: https://override.invalid/geosite.dat}'
+[ "$(grep -c '^geodata-mode:' "$TMPDIR/config.yaml")" = 1 ]
+[ "$(grep -c '^geox-url:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q 'example.invalid' "$TMPDIR/config.yaml"
+
+# A rejected custom configuration must fall back to the subscription settings.
+printf '#!/bin/sh\nexit 1\n' >"$TMPDIR/CrashCore"
+chmod +x "$TMPDIR/CrashCore"
+logger() { :; }
+set +e
+test_yaml
+set -e
+assert_line 'geodata-mode: true'
+assert_line '    https://example.invalid/geosite.dat'
+[ "$(grep -c '^geox-url:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q 'override.invalid' "$TMPDIR/config.yaml"
+
+setup inline
+printf 'geox-url: {geosite: https://inline.invalid/geosite.dat}\ngeo-auto-update: false\n---\nmixed-port: 1234\n' >"$core_config"
+merger_yaml
+assert_line 'geox-url: {geosite: https://inline.invalid/geosite.dat}'
+assert_line 'geo-auto-update: false'
+! grep -qE '^---|^mixed-port: 1234' "$TMPDIR/config.yaml"
+
+setup absent
+printf 'rules:\n - MATCH,DIRECT\n' >"$core_config"
+merger_yaml
+! grep -qE '^geo(data|site|x|-)' "$TMPDIR/config.yaml"
+assert_line 'mode: Rule'
+echo 'PASS: inherited geodata, overrides, fallback, inline maps, cleanup and absent settings'
diff --git a/tests/test_fw_ipv6_prefix.sh b/tests/test_fw_ipv6_prefix.sh
new file mode 100755
index 00000000..63e7982f
--- /dev/null
+++ b/tests/test_fw_ipv6_prefix.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+set -eu
+
+ROOT=$(cd "$(dirname "$0")/.." && pwd)
+. "$ROOT/scripts/starts/fw_getlanip.sh"
+
+assert_equal() {
+    if [ "$1" != "$2" ]; then
+        echo "expected: [$1]" >&2
+        echo "actual:   [$2]" >&2
+        exit 1
+    fi
+}
+
+route_output='default via fe80::1 dev eth0
+default from 240e:1234:5600::/56 via fe80::1 dev pppoe-wan
+2408:8266:501:2443::/64 dev enp2s0 proto kernel
+2606:4700::/48 via fe80::2 dev eth0
+unreachable 240e:1234:5600::/48 dev lo'
+actual=$(printf '%s\n' "$route_output" | ipv6_route_prefixes | sort -u)
+expected='2408:8266:501:2443::/64
+240e:1234:5600::/56'
+assert_equal "$expected" "$actual"
+
+# OpenWrt prefers the LAN assignment over the wider delegated prefix.
+systype=mi_snapshot
+lan_ifaces='br-lan'
+ubus() {
+    printf '%s\n' '{ "l3_device": "br-lan" }'
+}
+ip() {
+    case "$*" in
+    '-6 route show dev br-lan')
+        echo 'default from 240e:1234:5600::/56 via fe80::1 dev br-lan'
+        echo '240e:1234:5600:1::/64 dev br-lan proto static'
+        ;;
+    '-6 route show default') echo 'default from 240e:1234:5600::/56 via fe80::1 dev pppoe-wan' ;;
+    esac
+}
+actual=$(get_ipv6_prefixes)
+assert_equal '240e:1234:5600:1::/64' "$actual"
+
+# OpenWrt falls back to source-specific routes when its LAN route is hidden.
+lan_ifaces=
+ubus() {
+    return 0
+}
+ip() {
+    case "$*" in
+    '-6 route show default') echo 'default from 240e:1234:5600::/56 via fe80::1 dev pppoe-wan' ;;
+    esac
+}
+actual=$(get_ipv6_prefixes)
+assert_equal '240e:1234:5600::/56' "$actual"
+
+# Standard Linux uses the directly connected route on the discovered LAN.
+systype=container
+lan_ifaces='enp2s0'
+ip() {
+    case "$*" in
+    '-6 route show dev enp2s0') echo '2408:8266:501:2443::/64 dev enp2s0 proto kernel metric 256' ;;
+    esac
+}
+actual=$(get_ipv6_prefixes)
+assert_equal '2408:8266:501:2443::/64' "$actual"
+
+# BusyBox based router firmware does not need route protocol metadata.
+systype=Padavan
+lan_ifaces='br0'
+ip() {
+    case "$*" in
+    '-6 route show dev br0') echo '2001:db8:abcd:1::/64 dev br0 metric 256' ;;
+    esac
+}
+actual=$(get_ipv6_prefixes)
+assert_equal '2001:db8:abcd:1::/64' "$actual"
+
+ts_service=ON
+wg_service=OFF
+build_host_ipv6 '2408:8266:501:2443::/64 invalid-value'
+assert_equal '2408:8266:501:2443::/64 fd00::/8 fd7a:115c:a1e0::/48 fe80::/10' "$host_ipv6"
+
+echo 'IPv6 prefix tests passed'
diff --git a/tests/test_fw_nftables_ipv6.sh b/tests/test_fw_nftables_ipv6.sh
new file mode 100755
index 00000000..4da01b46
--- /dev/null
+++ b/tests/test_fw_nftables_ipv6.sh
@@ -0,0 +1,78 @@
+#!/bin/sh
+set -eu
+
+ROOT=$(cd "$(dirname "$0")/.." && pwd)
+
+reserve_ipv4='0.0.0.0/8 127.0.0.0/8'
+reserve_ipv6='::/128 ::1/128 fe80::/10 ff00::/8'
+host_ipv4='192.168.1.0/24'
+local_ipv4='192.168.1.1'
+host_ipv6='2001:db8:1::/64 fd00::/8 fe80::/10'
+common_ports=OFF
+ports=
+PORTS=
+mix_port=7890
+redir_port=7892
+tproxy_port=7893
+dns_redir_port=1053
+routing_mark=7894
+fwmark=7892
+firewall_area=3
+macfilter_type='黑名单'
+cn_ip_route=OFF
+dns_mod=route
+ipv6_redir=ON
+quic_rj=OFF
+lan_proxy=true
+local_proxy=true
+redir_mod=Tproxy
+tun_statu=false
+vm_redir=OFF
+fw_wan=ON
+fw_wan_ports=
+vms_port=
+sss_port=
+db_port=9090
+systype=linux
+CRASHDIR=/nonexistent
+BINDIR=/nonexistent
+
+nft() {
+    if [ "$1" = list ] && [ "$2" = set ]; then
+        return 1
+    fi
+    printf '%s' "$1"
+    shift
+    printf ' %s' "$@"
+    printf '\n'
+}
+
+modprobe() {
+    return 0
+}
+
+. "$ROOT/scripts/starts/fw_nftables.sh"
+rules=$(start_nftables || :)
+
+require_rule() {
+    if ! printf '%s\n' "$rules" | grep -Fq "$1"; then
+        echo "missing generated rule: $1" >&2
+        exit 1
+    fi
+}
+
+require_rule 'add set inet shellcrash lan_ip6'
+require_rule 'flags interval ; auto-merge'
+require_rule 'add element inet shellcrash lan_ip6'
+require_rule 'add rule inet shellcrash prerouting ip6 daddr @lan_ip6 return'
+require_rule 'add rule inet shellcrash prerouting ip6 saddr != @lan_ip6 return'
+require_rule 'add rule inet shellcrash prerouting_dns ip6 saddr != @lan_ip6 return'
+require_rule 'add rule inet shellcrash input ip6 saddr @lan_ip6 accept'
+require_rule 'add rule inet shellcrash output ip6 daddr @lan_ip6 return'
+
+if printf '%s\n' "$rules" | grep -Fq 'add rule inet shellcrash output ip6 saddr'; then
+    echo 'output must not depend on a dynamic IPv6 source prefix' >&2
+    exit 1
+fi
+
+echo 'nftables IPv6 rule generation tests passed'