I am currently adding another circuit to an additional
ISP for my network. I want to be able to use the
first circuit for a redundant backup but am not clear
on how to accomplish this.
The setup:
(diagram located at
http://www.geocities.com/bwilcox_email/Routing_Design.html)
- watch word wrap
Internal LAN connected to two PIX's, one in failover
mode. The PIX's current default route points to the
old ISP (government). All of our internal (public)
addresses are from the Government ISP's address space,
which we have a /25 block. I'm currently NATing my 10
net to this pool. I have an internal web server that
the users need access to from outside the network.
I'm adding the new circuit via PacBell and would like
traffic to take that route and failover to the
Government ISP.
First solution: do BGP. Well, I can't. I only have a
/25, too specific, from the Government ISP and I have
to maintain the same address space. So my next
thought would be to PAT everything out the PacBell
circuit. That's fine and dandy but then the web
server will reply to the source with a different
address. I'd like to route the web server to the
Government ISP. The only way I can think of doing
that is via some sort of route map or policy map.
Any comments would be greatly appreciated.
Thanks, Brian
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