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设置RHEL 6.5优先使用Wifi网络，次优先使用本地eth0网络

在RHEL6.5上设置了两个网络，一个使用无线网卡连接上Wifi网络，另一个使用eth0网线，两个网络都正确分配了网络地址，可以正常连通。理想状况是，使用Wifi网络连接互连网，本地eth0网卡连接网线，连接本地路由，不上网。那么问题来了，现在电脑优先使用本地eth0网线，无法连接互联网，可以看到，ping 8.8.8.8没有走192.168.0.1连接互联网，转而走了192.168.26.2的本地eth0网络，症状如下：

[root@ipa ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.26.2 icmp_seq=1 Destination Net Unreachable
From 192.168.26.2 icmp_seq=2 Destination Net Unreachable
From 192.168.26.2 icmp_seq=3 Destination Net Unreachable

两个网络状态显示如下，
192.168.0.* wlan0 网络是本地Wifi路由，连接了上互联网的路由器。
192.168.26.* eth0 网络是本地eth0网线，连接了不上网的路由器，主要是访问本地网络。

[root@ipa ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:18:8B:AF:22:C2
          inet addr:192.168.26.120  Bcast:192.168.26.255  Mask:255.255.255.0
          inet6 addr: fe80::218:8bff:feaf:22c2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1074 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1338 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:101649 (99.2 KiB)  TX bytes:222831 (217.6 KiB)
          Interrupt:18

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:717 errors:0 dropped:0 overruns:0 frame:0
          TX packets:717 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:58793 (57.4 KiB)  TX bytes:58793 (57.4 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:18:F3:38:6E:79
          inet addr:192.168.0.181  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::218:f3ff:fe38:6e79/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:904 errors:0 dropped:0 overruns:0 frame:0
          TX packets:635 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:132360 (129.2 KiB)  TX bytes:79696 (77.8 KiB)

[root@ipa ~]#

参考How can I give internet priority to wifi instead of ethernet?
设置Use this connection only for resources on its network，如下图所示，这样就设置了本地eth0网线只做本址资源路由，电脑在连接互联网就不走这个本地eth0网线路由了，转而从Wifi wlan0网络路由走，这样电脑就可以正常连接互联网了。
Use this connection only for resources on its network

验证能够连接互联网，

[root@ipa ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=55 time=15.2 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=55 time=6.31 ms
^C

测试traceroute指令。

[root@ipa ~]# traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  183.90.44.113 (183.90.44.113)  7.892 ms  12.932 ms an-ts-br05.starhub.net.sg (183.90.44.33)  12.929 ms
 2  183.90.44.229 (183.90.44.229)  13.377 ms  18.804 ms 183.90.44.237 (183.90.44.237)  25.112 ms
 3  203.117.36.57 (203.117.36.57)  15.705 ms 203.116.188.73 (203.116.188.73)  33.720 ms 203.117.36.53 (203.117.36.53)  39.933 ms
 4  203.117.36.38 (203.117.36.38)  41.425 ms 203.117.36.42 (203.117.36.42)  43.251 ms 203.117.37.22 (203.117.37.22)  60.742 ms
 5  72.14.196.189 (72.14.196.189)  75.949 ms  83.927 ms *
 6  * 74.125.242.33 (74.125.242.33)  6.042 ms 108.170.240.161 (108.170.240.161)  10.754 ms
 7  108.170.235.207 (108.170.235.207)  22.345 ms dns.google (8.8.8.8)  29.520 ms 72.14.234.177 (72.14.234.177)  41.606 ms
[root@ipa ~]#

Reference

How can I give internet priority to wifi instead of ethernet?

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