Maybe I am missing something but is there a reason you can't use ISP
redundancy ?

On 6/13/05, Hal Dorsman <[EMAIL PROTECTED]> wrote:
> To get ISP redundancy you need to use BGP and get an Autonomous System
> number.  You will need to coordinate this with both ISPs, and you will
> need a pretty beefy router capable of handling the BGP routing tables.
> Yes, your FW would still be a single pof, but at least you have control
> over that and can have at least a cold standby.
> 
> Hal
> 
> -----Original Message-----
> From: . security [mailto:[EMAIL PROTECTED]
> Sent: Monday, June 13, 2005 9:32 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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