Force traceroute to use specific NIC?

[Matt Hearn]

I'm trying to trace a route from my server to another server, but traceroute inexplicably defaults to using the NIC that I use for my MC/SG heartbeat. It's clearly not going to get to the other server that way!

Is there any way to tell traceroute to use a specific lan card? The man page is uninformative on the subject.

Note: I know that I CAN get to the other server (pings return just fine), but I want to know HOW.

Thanks!

[Steven E. Protter]

In /etc/rc.config.d/netconf

There is a primary lan connection. This is the default that traceroute uses.

Also the default route comes into play, what IP is most compatible with the lan card.

netstat -rn

If the default route changes the traceroute will take a different route. Of course messing with any of this could have an impact on Service Guard, which I'm only just beginning to learn.

SEP

[Mark Greene_1 · Accepted solution]

Use the -i option to specify which NIC


mark

[Jeff Schussele]

Agree with Mark.

Ue the -i lanX or the -s ip_address parms to denote where to go out.

This is evidently a new "feature" introduced recently & it appears to me that w/o these the first NIC in a netstat -in output is chosen as source.

Rgds,
Jeff

[Kevin Wright]

you can use traceroute -i or traceroute -s

[Ron Kinner]

I believe traceroute -s A.B.C.D will only tell it to use A.B.C.D as the source address but will not force it to use the correct interface. Best to stick with the -i option.

Ron