How to get the gateway MAC address in Unix-like systems

Question

I'm connected to a private network where the IP addresses are like 192.168.xxx.xxx. I know the IP address of the default gateway but how do I get the gateway mac address? I'm working on iMac and Linux machines. Any Unix command for that?

Please go to this link: [1]: http://stackoverflow.com/questions/6782658/how-to-get-default-gateway-in-mac-osx — Bun S., Apr 14 '14 at 19:24

score 1 · Answer 1 · answered Apr 14 '14 at 20:04

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This gives you list of everything:

netstat -rn

or this one to get default gateway:

netstat -rn | grep 'default'

WHAT YOU REALLY WANT:

netstat -rn | grep 'default' | awk '{print $2}'

answered Apr 14 '14 at 20:04

Bun S.

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In Centos 7 the output does not include MAC addresses. – Valerio Bozz Mar 31 '20 at 07:56

score 1 · Answer 2 · answered Feb 02 '20 at 10:48

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Here the command line example for arping assuming your gateway's IP address is 192.168.1.1 and you have connected over eth0:

arping -f -I eth0  192.168.1.1
ARPING 192.168.1.1 from 192.168.1.24 eth0
Unicast reply from 192.168.1.1 [ab:cd:ef:01:02:03]  1.030ms
Sent 1 probes (1 broadcast(s))
Received 1 response(s)

So in this case gateway's MAC address is ab:cd:ef:01:02:03

answered Feb 02 '20 at 10:48

Oleg Neumyvakin

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I used this solution instead `netstat` because `netstat -rn` does not include MAC addresses in Centos 7. – Valerio Bozz Mar 31 '20 at 07:58

How to get the gateway MAC address in Unix-like systems

2 Answers2