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Re: [LUG] Mulithomed server - how?



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John Horne wrote:
>
> Ther problem is how to configure this?? At startup both nic's
are seen
> but the routing table only shows one. If I add a static route
for the
> gateway using the missing nic, and a default to the gateway
using that
> nic, then I can get access to/from the server. However,
ifconfig seems
> to indicate that most traffic goes to/from one nic far more
often that
> the other nic. Also each server cannot ping the other one,
despite the
> fact that they are on the same subnet.
>
> Has anyone done anything like this? I can find very little
about it from
> the 'net. I asked on the rh list and have had no replies. It
seems that
> most people use multiple nic's for NAT mainly (one side with
private
> addresses, the other on the Internet) rather than resilience or
> load-balancing/performance.

The LARTC HOW-TO discusses some ideas, mainly aimed at routing
other boxes traffic, but well worth a read IMHO. It is not
uncommon approach to create a virtual address, and pretend you
are routing from it to the router, with redundant routes.

Another pragmatic but "dumb" approach is just to run different
traffic to/from each, and alias the address to the other if one
interfaces can't ping the router.

The "smart" way is to bind them at level 2, but this requires
compatible switch hardware I believe, but I think "config" tells
you about this option when your building a kernel ;-)

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