CODEWITHSUNDEEP
macosinterfaceroutesgateway
AppleDeveloper
AppleDeveloper

Reputation: 1443

can we change default gateway and interface in mac through commandline

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.

Upvotes: 1

Views: 8867

Answers (2)

grant
grant

Reputation: 1

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-

Upvotes: 0

robmathers
robmathers

Reputation: 3698

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.

Upvotes: 2

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