Another option is to run BGP inbound and HSRP outbound, with different
prefs for each subnet (subnet X pref is isp1, subnet Y pref is isp2) 


Cameron Kim


-----Original Message-----
From: . security [mailto:[EMAIL PROTECTED] 
Sent: Monday, June 13, 2005 8:32 AM
To: [email protected]
Subject: [FW-1] Redundant ISPs [single POF/route issue]

We are considering adding an additional ISP for redundancy purposes,
would it make an sense to plumb a second Internet connection into an
existing
infrastructure?   [see ASCII art below]

This infrastructure already has a working internet connection [isp1] my
guess it would create more problems that it would solve.

Off the top of my head, I've come up with these reasons not too:
-potential routing issue [asynchronous, confusion on the best route to
the internet] -failpoint, redundancy on the ISPs but the firewall are
still a single P.O.F -complex route tables on the firewall


internet[isp1]        internet[isp2]
    |                           |
[**********firewall***********]--------------------------|DMZ
       |
       |
internal network

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