在Linux上有两个接口：
Bond0: inet addr:170.242.57.113 Bcast:170.242.57.255 Mask:255.255.255.0 Eth4 : inet addr:172.21.136.124 Bcast:172.21.137.255 Mask:255.255.254.0 因为eth4在不同的networking上，所以我想设置一个新的路由
used route-eth4 ADDRESS0=172.21.136.0 NETMASK0=255.255.254.0 GATEWAY0=172.21.137.251
但是，这失败了，看着ifup，并解决/ etc / sysconfig / network-scripts / ifup-routes是设置路由的脚本，发出以下命令
ip route add 172.21.136.0/23 via 172.21.137.251 dev eth4 RTNETLINK answers: File exists
看起来像路线不能被添加为/ 23
但是，如果我用2/24来做的话
ip route add 172.21.136.0/24 via 172.21.137.251 dev eth4 ip route add 172.21.137.0/24 via 172.21.137.251 dev eth4 netstat –nr Kernel IP routing table Destination Gateway Genmask Flags MSS Window irttIface 172.21.137.0 172.21.137.251 255.255.255.0 UG 0 0 0 eth4 172.21.136.0 172.21.137.251 255.255.255.0 UG 0 0 0 eth4 170.242.57.0 0.0.0.0 255.255.255.0 U 0 0 0 bond0 172.21.136.0 0.0.0.0 255.255.254.0 U 0 0 0 eth4 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth4 0.0.0.0 170.242.57.251 0.0.0.0 UG 0 0 0 bond0
它工作正常，我不明白为什么它不工作的/ 23
Address: 172.21.136.124 10101100.00010101.1000100 0.01111100 Netmask: 255.255.254.0 = 23 11111111.11111111.1111111 0.00000000 Wildcard: 0.0.1.255 00000000.00000000.0000000 1.11111111 => Network: 172.21.136.0/23 10101100.00010101.1000100 0.00000000 (Class B) Broadcast: 172.21.137.255 10101100.00010101.1000100 1.11111111 HostMin: 172.21.136.1 10101100.00010101.1000100 0.00000001 HostMax: 172.21.137.254 10101100.00010101.1000100 1.11111110 Hosts/Net: 510 (Private Internet)
任何想法？
它工作正常，我不明白为什么它不工作的/ 23
因为它已经在那里 – 这就是RTNETLINK answers: File exists告诉你。
你的netstat -rt输出包含这个路由：
172.21.136.0 0.0.0.0 255.255.254.0 U 0 0 0 eth4
这与ip route add 172.21.136.0/23 via 172.21.137.251 dev eth4相冲突。
/ 23已经在你的桌子上了…
netstat -nr Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 172.21.137.0 172.21.137.251 255.255.255.0 UG 0 0 0 eth4 172.21.136.0 172.21.137.251 255.255.255.0 UG 0 0 0 eth4 170.242.57.0 0.0.0.0 255.255.255.0 U 0 0 0 bond0 172.21.136.0 0.0.0.0 255.255.254.0 U 0 0 0 eth4 <---------- 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth4 0.0.0.0 170.242.57.251 0.0.0.0 UG 0 0 0 bond0
另外请记住， ip route add 172.21.136.0/23 via 172.21.137.251 dev eth4有点不合理，因为172.21.137.251 在 172.21.136.0/23