cipe behind firewall on both sides

[rob apodaca <rob.apodaca,AT,attbi,DOT,com>]

Hello List,

I have tried to find a specific answer to this question and I have come
across some things that seem to indicate this is possible but I haven't
seen it clearly.

If I have this type of setup:
Lan1 <-> cipe1 <-> router1 <-> internet <-> router2 <-> cipe2 <-> Lan2

where both routers have firewalls.
The documentation seems to indicate that this would not be possible.
But, what if: 1. router1 forwards udp port whatever to cipe1 and same
for router2-cipe2. Would this work?

2. router1 is configured to put cipe1 in the dmz and same for
router2-cipe2. Would this work?

I would guess that each cipe box would only need one nic and be set to
route packets between eth0 and cipe0.

I am asking this because I frequently run into situations where people
do not want their existing routers replaced.

Thank you for any assistance.

-rob