>	sorry for vague question: are there any prior art for equal cost
>	multipath support (like multiple rt_gateway), specifically in terms
>	of modifications to routing socket messages?  if there's some code
>	publically available, it would be nicer.

the only thing i can think of that comes to mind is the per interface
default route stuff that vixie did a few years back (on bsdi version
2.something).

    ftp://ftp.vix.com/pub/vixie/ifdefault/

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