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PPTP Passthrough on Cisco to ISA 2004

Posted on 2008-10-07
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Last Modified: 2008-11-17
Hi Everyone,

We currently use an ISA 2004 server as our primary firewall and PPTP VPN termination point into our network.  I have been configuring and testing a new Cisco ASA5510 and have it running alongside the ISA with a second internet connection etc...  We plan on replacing the ISA server with the Cisco and I have configured IPSec VPN with RSA SecurID tokens on the Cisco, however due to the large rollout and potential issues, I would like to able to configure the Cisco to passthrough PPTP traffic to the ISA Server to terminate there.  Effectively giving me two places where VPN's will terminate to.

Has anyone done this before?  Is there any considerations I need to think about?

I planned on doing a static nat between one of our external IP Addresses and the ISA Server (which would have an internal IP Address)
The ISA Server would have a default gateway of our Internal Router which is configured to send an WAN VPN traffic to our other offices, and 0.0.0.0 0.0.0.0 to the Cisco.

This would let us slowly roll out the Cisco VPN with RSA Tokens while some users continue connecting to their current ISA PPTP VPN.

Any input is much appreciated.
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Question by:NutrientMS
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4 Comments
 
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Pugglewuggle earned 2000 total points
ID: 22665719
This can work, but I highly suggest you terminate VPN on the ASA and then route the traffic through ISA if it's an option.
PPTP is very picky with NAT and other technologies and doesn't generally play well with others.
If you MUST use it (not generally recommended) then you can use the information in this article to get what you need done!
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a0080094a5a.shtml
Cheers! Let me know if you have any questions!
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by:NutrientMS
ID: 22665723
Thanks, I will have a read of it.  We do need to use it just at the start as we can't do a clean cutover from the ISA to the Cisco.
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LVL 12

Expert Comment

by:Pugglewuggle
ID: 22665751
I understand...
Just let me know if you have any questions!
Cheers!
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LVL 5

Author Comment

by:NutrientMS
ID: 22811800
Hey PuggleWuggle,

This worked like a charm.  Thanks heaps!
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