我有一个运行Ubuntu两个networking接口的VPS。
这是启用第二个networking接口后的ifconfig输出：
ens32 Link encap:Ethernet HWaddr 00:50:56:a8:36:67 inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fea8:3667/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1883513 errors:0 dropped:280 overruns:0 frame:0 TX packets:362667 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:251522994 (251.5 MB) TX bytes:72543049 (72.5 MB) ens34 Link encap:Ethernet HWaddr 00:50:56:9b:65:a0 inet addr:10.20.96.88 Bcast:10.20.97.255 Mask:255.255.254.0 inet6 addr: fe80::250:56ff:fe9b:65a0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:281993 errors:0 dropped:85 overruns:0 frame:0 TX packets:58 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:18905402 (18.9 MB) TX bytes:4380 (4.3 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:172 errors:0 dropped:0 overruns:0 frame:0 TX packets:172 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:12848 (12.8 KB) TX bytes:12848 (12.8 KB) 我有一个服务器绑定在端口9601可访问http://192.168.1.20:9601 ，但是http://10.20.96.88:9601无法访问。
ip路由输出：
default via 192.168.1.1 dev ens32 onlink 10.20.96.0/23 dev ens34 proto kernel scope link src 10.20.96.88 192.168.1.0/24 dev ens32 proto kernel scope link src 192.168.1.20
ufw状态输出：
Status: inactive
ping 10.20.96.88输出：
PING 10.20.96.88 (10.20.96.88) 56(84) bytes of data. 64 bytes from 10.20.96.88: icmp_seq=1 ttl=64 time=0.047 ms 64 bytes from 10.20.96.88: icmp_seq=2 ttl=64 time=0.044 ms 64 bytes from 10.20.96.88: icmp_seq=3 ttl=64 time=0.052 ms 64 bytes from 10.20.96.88: icmp_seq=4 ttl=64 time=0.062 ms 64 bytes from 10.20.96.88: icmp_seq=5 ttl=64 time=0.052 ms 64 bytes from 10.20.96.88: icmp_seq=6 ttl=64 time=0.061 ms 64 bytes from 10.20.96.88: icmp_seq=7 ttl=64 time=0.051 ms 64 bytes from 10.20.96.88: icmp_seq=8 ttl=64 time=0.053 ms 64 bytes from 10.20.96.88: icmp_seq=9 ttl=64 time=0.048 ms
如果你想使用这个IP作为专用的IP来通信某个特定的服务器，你应该定义静态路由 。