Quoting Wai Chan <[EMAIL PROTECTED]>:
> I have two ISPs (two different serial links to my router). I want 50%
> of
> all outgoing traffic go through ISP 1 with ISP 1 provided IP address as
> source address, and the other 50% of all outgoing traffic go through ISP
> 2
> with ISP 2 provided IP address as source address.
>
Is there any reason you can't just build a second router and plug
the serial link from the second ISP into it, then take the inside
interfaces of both routers and plug them into the same hub, and run multiple
address ranges on the hub? Then put half of your systems on one IP range
and half of them on the other.
I realize that your not going to divide the traffic up 50% this way but
the problem is (and was just thashed over in this list less than a week
ago) that ISP #1 cannot route IP numbers supplied by ISP #2, and ISP #2
cannot route IP numbers supplied by ISP #1, unless you have been given
entire netblocks by both ISP's and are running BGP with both and are
advertising those netblocks. Even then, load balancing is a tricky problem
because it's almost entirely dependent on the destination IP numbers that
traffic from your servers is going to. If you were multihomed with your own AS
in the manner you would find that in most cases, traffic is going to favor one
interface over the other. Generally, if your careful in picking your feeds
it's not going to be worse than 60/40 one way or the other, but if you do
something like using a very well connected network for one link and a poorly
connected network for the other, it can be as bad as 90/10.
Have you investigated bonding or multilink with one of your ISP's? There's
also a way to multiplex T1's together that some ISP's support.
Ted Mittelstaedt [EMAIL PROTECTED]
Author of: The FreeBSD Corporate Networker's Guide
Book website: http://www.freebsd-corp-net-guide.com
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