macos: 删除无效的路由

一，查看路由表

liuhongdi@liuhongdideMBP ~ % netstat -r -n                  
Routing tables

Internet:
Destination        Gateway            Flags           Netif Expire
default            192.168.31.1       UGScg             en0       
10.8.0.1/32        10.8.0.5           UGSc            utun9       
10.8.0.4/30        10.8.0.6           UGSc            utun9       
10.8.0.5           10.8.0.6           UH              utun9       
127                127.0.0.1          UCS               lo0       
127.0.0.1          127.0.0.1          UH                lo0       
169.254            link#4             UCS               en0      !
192.168.31         link#4             UCS               en0      !
192.168.31.1/32    link#4             UCS               en0      !
192.168.31.1       d4:da:21:a2:64:b1  UHLWIir           en0   1169
192.168.31.29      ca:a2:21:99:6f:9   UHLWI             en0    837
192.168.31.38      f0:18:98:3c:33:2c  UHLWI             en0   1113
192.168.31.39      2e:de:eb:70:a6:47  UHLWIi            en0    608
192.168.31.44      9e:dc:3f:fc:df:9b  UHLWI             en0   1158
192.168.31.60/32   link#4             UCS               en0      !
192.168.31.60      ac:bc:32:8f:df:99  UHLWI             lo0       
192.168.31.61      6e:dc:f1:d0:c0:d3  UHLWI             en0    778
192.168.31.66      92:7b:41:2f:eb:e1  UHLWI             en0     95
192.168.31.86      b6:da:a:40:94:19   UHLWI             en0   1158
192.168.31.120     5e:3c:e9:96:c2:18  UHLWI             en0    416
192.168.31.134     be:27:db:6e:77:5c  UHLWI             en0    152
192.168.31.150     ce:88:20:f:e:8b    UHLWI             en0     85
192.168.31.201     60:f8:1d:eb:d1:5f  UHLWI             en0    405
224.0.0/4          link#4             UmCS              en0      !
224.0.0.251        1:0:5e:0:0:fb      UHmLWI            en0       
255.255.255.255/32 link#4             UCS               en0      !

...

其中 10.8.打头的需要删除

二，删除无用的路由

% sudo route delete -net 10.8.0.1/32
delete net 10.8.0.1

% sudo route delete -net 10.8.0.4/30
delete net 10.8.0.4

% sudo route delete -host 10.8.0.5  
delete host 10.8.0.5