我们可以通过命令行更改mac中的默认网关和接口吗

Question

We can see default gateway and interface of MAC by using following command

route -n get default

I know that this is possible in linux and can be achieved by following commands

route change default -interface $INTF route change 192.168.0.0/16 -interface $INTF But these are not working in MAC. My objective is to change the Default Gateway and interface.

Answer 1

The networksetup utility should be able to do what you want.

For example, to manually set up the standard Ethernet interface with an IP of 192.168.100.100 , subnet of 255.255.255.0 and gateway of 192.168.100.1 :

networksetup -setmanual "Ethernet" 192.168.100.100 255.255.255.0 192.168.100.1

You might also be interested in the -setadditionalroutes flag.

Answer 2

I recently had an instance where someone setup dual default routes

grant@dd08-mac:~[20220909-15:59][#8625]% netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags           Netif Expire
default            10.17.124.1        UGScg             en0       
default            10.1.78.1          UGScIg        bridge0       
10.1.78/24         link#16            UCS           bridge0      !
10.1.78.1/32       link#16            UCS           bridge0      !
10.1.78.1          link#16            UHLWIir       bridge0      !
10.1.78.24         link#16            UHLWI         bridge0      !
10.1.78.58/32      link#16            UCS           bridge0      !
10.1.78.58         36.6a.e9.47.a5.80  UHLWIi            lo0       
10.1.78.255        ff.ff.ff.ff.ff.ff  UHLWbI        bridge0      !
-snip-

I reset the interface with networksetup - this deleted the extra route

grant@dd08-mac:~[20220909-16:04][#8885]% sudo networksetup -setmanual Ethernet 10.17.124.78 255.255.255.0 0.0.0.0
Password:
grant@dd08-mac:~[20220909-16:11][#8924]

and the extra route is gone

grant@dd08-mac:~[20220909-16:11][#8964]% netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags           Netif Expire
default            10.1.78.1          UGScg         bridge0       
10.1.78/24         link#16            UCS           bridge0      !
10.1.78.1/32       link#16            UCS           bridge0      !
10.1.78.1          link#16            UHRLWIir      bridge0     19
10.1.78.58/32      link#16            UCS           bridge0      !
10.1.78.58         36.6a.e9.47.a5.80  UHLWIi            lo0       
10.17.124/24       link#9             UCS               en0      !
10.17.124.5        0:25:90:55:6d:e3   UHLWIi            en0   1191
10.17.124.78/32    link#9             UCS               en0      !
-snip-