Mechanisms for a multi-homed host to pick the best router

William Waites ww at styx.org
Thu Sep 18 12:58:27 CDT 2008


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>> So, for example, if the server receives the SYN from router R3, it  
>> would
>> send the SYN ACK and all subsequent packets for the TCP connection  
>> over that
>> same interface R3.
>> ...
>
> right idea.  works great.  see the following:
>
> http://www.academ.com/nanog/feb1997/multihoming.html
> http://www.irbs.net/internet/nanog/9706/0232.html
> http://gatekeeper.dec.com/pub/misc/vixie/ifdefault/


This approach is particularly useful for host with multiple IPv6  
tunnels. Some
tunnel providers implement strict RPF, some don't. Where this is the  
case,
having multiple tunnels (cf multiple address ranges) is problematic.  
Of course
these days perhaps perhaps the IPv4 variant could be done with a  
stateful NAT.

Maybe case could be made for IPv6 NAT (and site-local addresses?) in  
this scnario...

- -w
- --
William Waites                       <ww at styx.org>
http://www.irl.styx.org/          +49 30 8894 9942
CD70 0498 8AE4 36EA 1CD7  281C 427A 3F36 2130 E9F5

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