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I have an overly complicated developer network setup with Ethernet, WLAN and VPN.

I can connect to certain server but I need to know which actual network device / router was used to make the connection. Depending on which network is used certain ports might be blocked and I have a suspicion the connection isn't going the way it should.

I use macOS but I'm fine terminal commands and have most of the gnu tools installed via MacPorts.

  • On Windows this is done with tracert <destination name or IP>. You'll be shown the address of every router along the route. Not sure what the equivalent is on MacOS. – Twisty Impersonator Nov 19 '18 at 10:59
  • Does macOS by chance have route -4 get <ip> / route -6 get <ip> (as in FreeBSD)? – grawity Nov 19 '18 at 11:30
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You can use route get 8.8.8.8 to find out which interface and gateway on the local computer is used according to the local routing rules. The -4 and -6 options as on BSD don't work, but the -n option for numerical output does work.

You can also use traceroute 8.8.8.8 to find out the intermediate routers on the path (with the usual caveats when doing a traceroute).

Edit

8.8.8.8 stands of course for the IP address you want to reach, it needn't be literally 8.8.8.8.

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    Or in the case of an internal routing issue, substitute 8.8.8.8 with the IP of your internal target host. – Twisty Impersonator Nov 19 '18 at 12:51
  • Thanks. route get gave me the output i needed and was able to fix the problem, – Martin Nov 19 '18 at 16:16
  • alternative to traceroute => mtr – Hannu Nov 19 '18 at 17:12

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