openwrt ping: sendto: Network unreachable解决办法

root@OpenWrt:/# ping zhihu.com
PING zhihu.com (103.41.167.234): 56 data bytes
ping: sendto: Network unreachable

• 这个错误一般是由于网关配置错误导致的
• 通过 route 查看路由表

  root@OpenWrt:/# route
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  172.17.0.0      *               255.255.0.0     U     0      0        0 docker0
  192.168.11.0    *               255.255.255.0   U     1      0        0 eth1
  192.168.12.0    *               255.255.255.0   U     1      0        0 eth2
  192.168.233.0   *               255.255.255.0   U     0      0        0 br-lan

• 可以看到Gateway一栏为空，也就是没有配置网关，路由不知将数据转发到哪个网口。解决办法是增加一条默认网关。添加命令： route add default gw XXX.XXX.XXX.XXX ，XXX.XXX.XXX.XXX为你的上级网关，一般为光猫的IP。添加完成后通过 route 查看路由表是否生效

  route add default gw 192.168.11.1
  root@OpenWrt:/# route
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  default         192.168.11.1    0.0.0.0         UG    0      0        0 eth1
  172.17.0.0      *               255.255.0.0     U     0      0        0 docker0
  192.168.11.0    *               255.255.255.0   U     1      0        0 eth1
  192.168.12.0    *               255.255.255.0   U     1      0        0 eth2
  192.168.233.0   *               255.255.255.0   U     0      0        0 br-lan
  root@OpenWrt:/# 

• 可以看到默认网关default已被添加进路由表，ping外网成功

• root@OpenWrt:/# ping bilibili.com
  PING bilibili.com (110.43.34.66): 56 data bytes
  64 bytes from 110.43.34.66: seq=0 ttl=51 time=27.996 ms
  64 bytes from 110.43.34.66: seq=1 ttl=51 time=18.906 ms
  64 bytes from 110.43.34.66: seq=2 ttl=51 time=19.691 ms
  64 bytes from 110.43.34.66: seq=3 ttl=51 time=19.945 ms
  64 bytes from 110.43.34.66: seq=4 ttl=51 time=19.169 ms
  64 bytes from 110.43.34.66: seq=5 ttl=51 time=22.988 ms
  64 bytes from 110.43.34.66: seq=6 ttl=51 time=19.152 ms
  ^C
  --- bilibili.com ping statistics ---
  7 packets transmitted, 7 packets received, 0% packet loss
  round-trip min/avg/max = 18.906/21.121/27.996 ms
  root@OpenWrt:/#