traceroute: Warning: Multiple interfaces found;

[jnothinghead]

Hello,
When I run a tracerout I get this result.
traceroute: Warning: Multiple interfaces found;

The route I want to use skips the default route because of this error and goes out the wrong interface. Is there a way to correct this problem so that the route goes out the proper path?


Thanks a million
John

 

[StickyBit]

Hi John,

This problem will occur if you have two interfaces (outside/inside) and the inside interface is probed before the outside interface. Traceroute will always use the interface that is probed first at boot time as it's default interface. In your case it's using the inside interface which is probably connected to a private network. A quick fix for this problem would be to specify the interface to use when performing the traceroute e.g.

traceroute -i rtls0 192.168.1.2 (rtls0 being outside interface).

The real fix for this problem is to make sure that the outside interface or the interface you want traceroute to use as default, is probed first. Remove the interfaces using ifconfig [interface] unplumb, then reconfigure them making sure the interface you want to be primary is probed first.

Another way to accomplish this would be to edit the /etc/path_to_inst file making sure the "outside" interface is probed before the "inside" interface. However, I don't recommend this because I have never done this before, but I think its possible. Read man pages on path_to_inst before you do this.

I had this problem before, unfortunately I can't remember how I fixed it, but it's along the lines above. Good luck and post back your successes.

Stickybit.