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2 internet connections behind 1 PIX - will it work?

Our office currently uses a 768K DSL connection for Internet access.  This connection is behind a PIX506.  We just had a new Point-to-Point T1 installed to a different ISP.  We want to use both connections to the internet (the DSL connection will just be used by our dept. going forward).  Do we need to buy a seperate firewall for each connection, or can we simply put the new T1 into a 1600 on the outside of the PIX, and then run both the DSL and T1 connections into a switch, and then into the PIX?

Many thanks!
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Les Moore
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The PIX can have only one default route for outbound traffic, so either you do some tricky route-mapping in the 1600 with the T1, and some creative use of NAT on the PIX, or you get another firewall for your department's use.

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epylko
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I'll try adding a 2nd ethernet port to the 1721 on my desk (was going to put it in another location next month) and see how that works and then feed that into the PIX... good idea.  I'll keep you posted. Thanks....
Thanks Eric.. I've ordered the 1721 with an extra Ethernet card, I drew it out and that makes total sense.  I should have thought of that.. thank goodness for the extra help out there on the internet...  Thanks again!
Will the outbound work using ISP 1 addresses over the ISP 2 network or vice versa? Who's IP add goes on the PIX?