ip route命令

下面修改路由配置：

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#修改路由命令 ~ sudo ip route del default ~ sudo ip route add default dev ppp0   ~ route -n Kernel IP routing table Destination     Gateway         Genmask         Flags Metric Ref    Use Iface 0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0 10.10.10.1      0.0.0.0         255.255.255.255 UH    0      0        0 ppp0 50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0   ~ ip route default dev ppp0  scope link 10.10.10.1 dev ppp0  proto kernel  scope link  src 10.10.10.3 50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200   ~ traceroute www.163.com traceroute to www.163.com (101.23.128.17), 30 hops max, 60 byte packets  1  localhost (10.10.10.1)  281.093 ms  281.414 ms  280.941 ms  2  router2-dal.linode.com (67.18.7.162)  281.225 ms  281.109 ms  281.841 ms  3  xe-2-0-0.car04.dllstx2.networklayer.com (67.18.7.93)  280.882 ms  284.002 ms  283.913 ms  4  po102.dsr01.dllstx2.networklayer.com (70.87.254.81)  284.123 ms  284.087 ms  283.979 ms  5  po21.dsr01.dllstx3.networklayer.com (70.87.255.65)  284.000 ms  283.921 ms  283.839 ms  6  ae16.bbr01.eq01.dal03.networklayer.com (173.192.18.224)  283.542 ms  279.296 ms  290.455 ms  7  dls-bb1-link.telia.net (213.248.102.173)  301.426 ms  302.092 ms  302.085 ms  8  las-bb1-link.telia.net (213.155.131.77)  327.192 ms  327.350 ms  327.344 ms  9  chinaunicom-ic-151188-las-bb1.telia.net (213.248.94.126)  478.941 ms  479.089 ms  479.083 ms 10  219.158.30.173 (219.158.30.173)  496.679 ms  496.673 ms  496.667 ms 11  219.158.97.57 (219.158.97.57)  516.819 ms  517.035 ms  517.011 ms 12  219.158.5.129 (219.158.5.129)  491.084 ms  490.018 ms  497.472 ms 13  219.158.100.130 (219.158.100.130)  518.239 ms  518.216 ms  518.192 ms 14  61.182.176.186 (61.182.176.186)  533.695 ms  533.673 ms  533.666 ms 15  101.23.255.230 (101.23.255.230)  512.212 ms  512.500 ms  512.479 ms 16  60.5.194.74 (60.5.194.74)  519.246 ms  519.815 ms  519.791 ms 17  101.23.255.45 (101.23.255.45)  526.522 ms  526.907 ms  526.844 ms 18  101.23.128.17 (101.23.128.17)  522.068 ms  517.535 ms  517.240 ms

查看第一跳，localhost (10.10.10.1)，已经通过VPN实现路由。
停止VPN

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~ sudo poff myvpn   ~ ifconfig eth0      Link encap:Ethernet  HWaddr 08:00:27:90:e8:19           inet addr:192.168.1.200  Bcast:192.168.1.255  Mask:255.255.255.0           inet6 addr: fe80::a00:27ff:fe90:e819/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1           RX packets:2270 errors:0 dropped:0 overruns:0 frame:0           TX packets:1991 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           RX bytes:207578 (207.5 KB)  TX bytes:184147 (184.1 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:16436  Metric:1           RX packets:0 errors:0 dropped:0 overruns:0 frame:0           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

再ping网站，发现网络出现问题。Network is unreachable

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~ ping www.163.com connect: Network is unreachable   ~ route -n Kernel IP routing table Destination     Gateway         Genmask         Flags Metric Ref    Use Iface 50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0   ~ ip route 50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200

重置路由

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~ sudo ip route add default via 192.168.1.1   ~ route -n Kernel IP routing table Destination     Gateway         Genmask         Flags Metric Ref    Use Iface 0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0 50.116.27.194   192.168.1.1     255.255.255.255 UGH   0      0        0 eth0 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0   ~ ip route default via 192.168.1.1 dev eth0 50.116.27.194 via 192.168.1.1 dev eth0  src 192.168.1.200 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.200   #再次ping网站，访问成功！ ~ ping www.163.com PING 163.xdwscache.glb0.lxdns.com (101.23.128.17) 56(84) bytes of data. 64 bytes from 101.23.128.17: icmp_req=1 ttl=54 time=25.6 ms 64 bytes from 101.23.128.17: icmp_req=2 ttl=54 time=25.5 ms 64 bytes from 101.23.128.17: icmp_req=3 ttl=54 time=27.8 ms

通过ip-up, ip-down配置路由

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~ sudo vi /etc/ppp/ip-up.d/route-traffic   #!/bin/bash /sbin/ip route add 50.116.27.194 via 192.168.1.1 /sbin/ip route del default /sbin/ip route add default dev ppp0   ~ sudo chmod 755 /etc/ppp/ip-up.d/route-traffic   ~ sudo vi /etc/ppp/ip-down.d/disableroute   #!/bin/bash /sbin/ip route add default via 192.168.1.1   ~ sudo chmod 755 /etc/ppp/ip-down.d/disableroute