I've been having problems with asymmetric routing for a week now, and found some interesting tidbits on the routing algorithm of HP-UX. Most of this was done with experimentation and lots of sniffing with tcpdump. There are so few documents on this subject, that I'm working on what I call a graypaper. I will should post it eventually. Serviceguard nodes are especially prone to this because many of them are multi-homed.
In the mean time, if you experience some asymmetric routing, send me an e-mail. There are some interesting ndd and route settings that can be tweaked to circument it. You need 11iv2 or later, or 11iv2 with TOUR 2.4.
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