diff --git a/fix-eth-name.sh b/fix-eth-name.sh
index 6d22fc4..09e3b36 100644
--- a/fix-eth-name.sh
+++ b/fix-eth-name.sh
@@ -134,6 +134,8 @@ fix_network_manager() {
     done
 }
 
+# debian 9 IPV6 onlink 路由需要 post-up
+
 # auto lo
 # iface lo inet loopback
 
@@ -147,6 +149,8 @@ fix_network_manager() {
 # iface eth0 inet6 static
 #     address 2602:1:0:80::100/64
 #     gateway 2602:1:0:80::1
+#     post-up ip route add 2602:1:0:80::1 dev eth0
+#     post-up ip route add default via 2602:1:0:80::1 dev eth0
 #     dns-nameserver 2606:4700:4700::1111
 #     dns-nameserver 2001:4860:4860::8888
 
@@ -171,6 +175,11 @@ fix_ifupdown() {
                 if [ -n "$ethx" ]; then
                     line=$(echo "$line" | awk "{\$2=\"$ethx\"; print \$0}")
                 fi
+            elif [[ "$line" = *" dev e"* ]]; then
+                if [ -n "$ethx" ]; then
+                    # awk 会去除前面的空格
+                    line=$(echo "$line" | sed -E "s/[^ ]*$/$ethx/")
+                fi
             fi
             if ! $del_this_line; then
                 echo "$line" >>"$tmp_file"
diff --git a/reinstall.sh b/reinstall.sh
index 9b5359e..fa36c4c 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -3113,8 +3113,10 @@ EOF
     # hack 3
     # 修改 trans.sh
     # 1. 直接调用 create_ifupdown_config
+    # shellcheck disable=SC2154
     insert_into_file $initrd_dir/trans.sh after '^: main' <<EOF
         distro=$nextos_distro
+        releasever=$nextos_releasever
         create_ifupdown_config /etc/network/interfaces
         exit
 EOF
diff --git a/trans.sh b/trans.sh
index 498f64f..ebd0e26 100644
--- a/trans.sh
+++ b/trans.sh
@@ -955,6 +955,21 @@ iface $ethx inet6 static
     address $ipv6_addr
     gateway $ipv6_gateway
 EOF
+            # debian 9
+            # ipv4 支持静态 onlink 网关
+            # ipv6 不支持静态 onlink 网关，需使用 post-up 添加，未测试动态
+            # ipv6 也不支持直接 ip route add default via xxx onlink
+            if [ "$distro" = debian ] && [ "$releasever" -le 9 ]; then
+                # debian 添加 gateway 失败时不会执行 post-up
+                # 因此 gateway post-up 只能二选一
+
+                # 注释最后一行，也就是 gateway
+                sed -Ei '$s/^( *)/\1# /' "$conf_file"
+                cat <<EOF >>$conf_file
+    post-up ip route add $ipv6_gateway dev $ethx
+    post-up ip route add default via $ipv6_gateway dev $ethx
+EOF
+            fi
         fi
 
         # dns