On Mon, Feb 26, 2001 at 10:00:59AM +1030, Ben Nagy wrote:
> A similar plan to this one (using real NICs, not virtuals) came up in the
> first thread. At the time, mouss pointed out that most stacks do not
> remember the interface they received a packet on when making outbound
> routing decisions (for the WWW response). I didn't believe it at the time,
> and tested it in the lab. I can report that humbling "learning experiences"
> are good for the soul. ;)
IP Stacks will remeber the IP Address of a incoming request and use it as
the outgoing source for TCP Conections. Therefore you can have a policy (aka
source) based routing to decide which outgoing NIC to use. In that case you
have two default routes and the decision which one is used is done by source
ip.
Of course this does not help very good in load balancing or high
availability. Becuase if one isp connection is down users will still have
probems to reach your web site. It will only help you if you are a AS and
announce your IP-Range yourself. Note: that this scenario is error prone and
comlicated ans must sites will not increase the reachability at all.
Greetings
Bernd
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