North American Network Operators Group|
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Re: default routes on Ciscos
> Just curious if anyone out there knows of a way to configure default > routes on a per interface basis on a Cisco. So that different interfaces > had different default routes statically defined. Others here have pointed out that this can be done using policy based routing. It's pretty hard to do per-interface default routes when you're not the sink for the packets, though, since there's otherwise no protocol control block or other state to hang the outbound default on. I suppose you could just do round robin for your outbound traffic. If you're using a BSD/OS, NetBSD, or FreeBSD machine and you're doing multi- homed web service (which _does_ give you protocol control blocks to use to hold your default route binding for outbound packets), there's some free code available to support per-interface default routes. It's a small change to the kernel and an even smaller one to the "route" and "netstat" commands. See ftp://ftp.vix.com/pub/vixie/ifdefault/ for source code and SF NANOG slides.