之前，介绍过通过搭建derp+tailscale组建VPN网络。最近，在新增一个节点的时候，该节点也加入了网络，但是无法ping通其他地址，也不能被别人ping通。

运行tailscale status。有异常。

# Health check:
#     - router: 6 add route failures; first was: network is down
#     - Some peers are advertising routes but --accept-routes is false

查看tailscaled服务，systemctl status tailscaled。看起来也没啥问题。

● tailscaled.service - Tailscale node agent
   Loaded: loaded (/usr/lib/systemd/system/tailscaled.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2023-10-23 15:36:22 CST; 1 weeks 3 days ago
     Docs: https://tailscale.com/kb/
  Process: 9778 ExecStartPre=/usr/sbin/tailscaled --cleanup (code=exited, status=0/SUCCESS)
 Main PID: 9820 (tailscaled)
   Status: "Connected; jacky; fd7a:115c:a1e0::8 100.64.0.8"
    Tasks: 11
   Memory: 40.8M
   CGroup: /system.slice/tailscaled.service
           └─9820 /usr/sbin/tailscaled --state=/var/lib/tailscale/tailscaled.state --socket=/run/tailscale...

查看tailscale0接口信息。该接口无法拿到ip地址。

51: tailscale0: <POINTOPOINT,MULTICAST,NOARP> mtu 1280 qdisc pfifo_fast state DOWN group default qlen 500
    link/none 

tcpdump抓从别处过来的包。能收到包，但是ping显示不通。

journalctl -xeu tailscaled -f
Nov 03 13:48:54 ecs-4508 tailscaled[9820]: Accept: ICMPv4{100.64.0.2:0 > 100.64.0.8:0} 84 icmp ok
Nov 03 13:49:04 ecs-4508 tailscaled[9820]: Accept: ICMPv4{100.64.0.2:0 > 100.64.0.8:0} 84 icmp ok
Nov 03 13:49:14 ecs-4508 tailscaled[9820]: Accept: ICMPv4{100.64.0.2:0 > 100.64.0.8:0} 84 icmp ok
Nov 03 13:49:24 ecs-4508 tailscaled[9820]: Accept: ICMPv4{100.64.0.2:0 > 100.64.0.8:0} 84 icmp ok

查看路由表。

ip route show table 52
空的

最终，通过重启tailscaled服务解决。

[root@ecs-4508 iproute2]#  systemctl restart tailscaled

查看接口信息

96: tailscale0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1280 qdisc pfifo_fast state UNKNOWN group default qlen 500
    link/none 
    inet 100.64.0.8/32 scope global tailscale0
       valid_lft forever preferred_lft forever

查看路由表

[root@ecs-4508 iproute2]# ip route show table 52
100.64.0.2 dev tailscale0 
100.100.100.100 dev tailscale0