我正在使用 OpenVPN 连接到 VPN 服务，一切正常。一旦我连接这些是自动设置的规则：
root@linux:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:AA:1B:01:AC:FB
inet addr:192.168.1.201 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:46867 errors:0 dropped:0 overruns:0 frame:0
TX packets:29742 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:37977382 (36.2 MiB) TX bytes:5098121 (4.8 MiB)
Interrupt:16
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.7.7.126 P-t-P:10.7.7.125 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:23284 errors:0 dropped:0 overruns:0 frame:0
TX packets:5817 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:31366374 (29.9 MiB) TX …