如何让 Openwrt 上的 tailscale 可以直连？

[qsnow6]

我在 OpenWRT 上安装了 tailscale ，并且开启了 IPV6 ，但是发现还是无法直连，总是通过 DERP 来中继。

我尝试着放行 IPV6 防火墙的 41641/udp ，发现还是一样。

以下是我的防火墙规则 Traffic Rules：

root@OpenWrt:~# uci show firewall
firewall.@defaults[0]=defaults
firewall.@defaults[0].input='ACCEPT'
firewall.@defaults[0].output='ACCEPT'
firewall.@defaults[0].forward='REJECT'
firewall.@defaults[0].synflood_protect='1'
firewall.@zone[0]=zone
firewall.@zone[0].name='lan'
firewall.@zone[0].network='lan'
firewall.@zone[0].input='ACCEPT'
firewall.@zone[0].output='ACCEPT'
firewall.@zone[0].forward='ACCEPT'
firewall.@zone[1]=zone
firewall.@zone[1].name='wan'
firewall.@zone[1].network='wan' 'wan6'
firewall.@zone[1].output='ACCEPT'
firewall.@zone[1].masq='1'
firewall.@zone[1].mtu_fix='1'
firewall.@zone[1].input='REJECT'
firewall.@zone[1].forward='REJECT'
firewall.@forwarding[0]=forwarding
firewall.@forwarding[0].src='lan'
firewall.@forwarding[0].dest='wan'
firewall.@rule[0]=rule
firewall.@rule[0].name='Allow-DHCP-Renew'
firewall.@rule[0].src='wan'
firewall.@rule[0].proto='udp'
firewall.@rule[0].dest_port='68'
firewall.@rule[0].target='ACCEPT'
firewall.@rule[0].family='ipv4'
firewall.@rule[1]=rule
firewall.@rule[1].name='Allow-Ping'
firewall.@rule[1].src='wan'
firewall.@rule[1].proto='icmp'
firewall.@rule[1].icmp_type='echo-request'
firewall.@rule[1].family='ipv4'
firewall.@rule[1].target='ACCEPT'
firewall.@rule[2]=rule
firewall.@rule[2].name='Allow-IGMP'
firewall.@rule[2].src='wan'
firewall.@rule[2].proto='igmp'
firewall.@rule[2].family='ipv4'
firewall.@rule[2].target='ACCEPT'
firewall.@rule[3]=rule
firewall.@rule[3].name='Allow-DHCPv6'
firewall.@rule[3].src='wan'
firewall.@rule[3].proto='udp'
firewall.@rule[3].dest_port='546'
firewall.@rule[3].family='ipv6'
firewall.@rule[3].target='ACCEPT'
firewall.@rule[4]=rule
firewall.@rule[4].name='Allow-MLD'
firewall.@rule[4].src='wan'
firewall.@rule[4].proto='icmp'
firewall.@rule[4].src_ip='fe80::/10'
firewall.@rule[4].icmp_type='130/0' '131/0' '132/0' '143/0'
firewall.@rule[4].family='ipv6'
firewall.@rule[4].target='ACCEPT'
firewall.@rule[5]=rule
firewall.@rule[5].name='Allow-ICMPv6-Input'
firewall.@rule[5].src='wan'
firewall.@rule[5].proto='icmp'
firewall.@rule[5].icmp_type='echo-request' 'echo-reply' 'destination-unreachable' 'packet-too-big' 'time-exceeded' 'bad-header' 'unknown-header-type' 'router-solicitation' 'neighbour-solicitation' 'router-advertisement' 'neighbour-advertisement'
firewall.@rule[5].limit='1000/sec'
firewall.@rule[5].family='ipv6'
firewall.@rule[5].target='ACCEPT'
firewall.@rule[6]=rule
firewall.@rule[6].name='Allow-ICMPv6-Forward'
firewall.@rule[6].src='wan'
firewall.@rule[6].dest='*'
firewall.@rule[6].proto='icmp'
firewall.@rule[6].icmp_type='echo-request' 'echo-reply' 'destination-unreachable' 'packet-too-big' 'time-exceeded' 'bad-header' 'unknown-header-type'
firewall.@rule[6].limit='1000/sec'
firewall.@rule[6].family='ipv6'
firewall.@rule[6].target='ACCEPT'
firewall.@rule[7]=rule
firewall.@rule[7].name='Allow-IPSec-ESP'
firewall.@rule[7].src='wan'
firewall.@rule[7].dest='lan'
firewall.@rule[7].proto='esp'
firewall.@rule[7].target='ACCEPT'
firewall.@rule[8]=rule
firewall.@rule[8].name='Allow-ISAKMP'
firewall.@rule[8].src='wan'
firewall.@rule[8].dest='lan'
firewall.@rule[8].dest_port='500'
firewall.@rule[8].proto='udp'
firewall.@rule[8].target='ACCEPT'
firewall.@rule[9]=rule
firewall.@zone[2]=zone
firewall.@zone[2].name='tailscale'
firewall.@zone[2].input='ACCEPT'
firewall.@zone[2].output='ACCEPT'
firewall.@zone[2].forward='ACCEPT'
firewall.@zone[2].masq='1'
firewall.@zone[2].mtu_fix='1'
firewall.@zone[2].network='tailscale'
firewall.@forwarding[1]=forwarding
firewall.@forwarding[1].src='tailscale'
firewall.@forwarding[1].dest='lan'
firewall.@forwarding[2]=forwarding
firewall.@forwarding[2].src='lan'
firewall.@forwarding[2].dest='tailscale'
firewall.@redirect[0]=redirect
firewall.@redirect[0].dest='lan'
firewall.@redirect[0].target='DNAT'
firewall.@redirect[0].proto='udp'
firewall.@redirect[0].src='wan'
firewall.@redirect[0].src_dport='41641'
firewall.@redirect[0].dest_port='41641'
firewall.@redirect[0].name='41641'
firewall.@redirect[0].dest_ip='192.168.1.1'
firewall.@rule[10]=rule
firewall.@rule[10].name='tailscale'
firewall.@rule[10].family='ipv6'
firewall.@rule[10].proto='udp'
firewall.@rule[10].src_port='41641'
firewall.@rule[10].dest_port='41641'
firewall.@rule[10].target='ACCEPT'
firewall.@rule[10].src='wan'
firewall.@rule[10].dest='lan'

已配置完成，使用默认教程安装完其实就会自动直连了。
https://openwrt.org/docs/guide-user/services/vpn/tailscale/start

[neroxps]

ipv6 放行的话应该是 forward

uci add firewall rule
uci set firewall.@rule[-1].name="tailscale"
uci set firewall.@rule[-1].src="wan"
uci set firewall.@rule[-1].dest="lan"
uci set firewall.@rule[-1].dest_ip="::1/-64"
uci set firewall.@rule[-1].family="ipv6"
uci set firewall.@rule[-1].proto="tcpudp"
uci set firewall.@rule[-1].target="ACCEPT"
uci commit firewall
/etc/init.d/firewall restart

[neroxps]

哦 漏了写端口。自己加一下把。

[qsnow6]

@neroxps #2
添加之后，发现能直连，但是不是通过 IPV6 连接的，还是走的 IPV4 NAT 的方式。

```bash
firewall.@rule[10]=rule
firewall.@rule[10].name='tailscale'
firewall.@rule[10].family='ipv6'
firewall.@rule[10].src='wan'
firewall.@rule[10].src_port='41641'
firewall.@rule[10].dest='lan'
firewall.@rule[10].dest_ip='::1/-64'
firewall.@rule[10].dest_port='41641'
firewall.@rule[10].target='ACCEPT'
firewall.@rule[10].proto='udp'
```

zed@zeddeMac-mini ~ % tailscale ping 100.122.96.133
pong from openwrt (100.122.96.133) via 183.220.46.122:1561 in 10ms

[qsnow6]

@neroxps #2 发现其实没必要折腾 IPV6 ，IPV6 必须要双方都要有公网 IPV6 地址。

问一下，如果要在 openwrt 上开放 41641/udp 给 tailscale ，下面这几个功能应该用哪一个。
Port Forwards
Traffic Rules
NAT Rules