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Old 01-27-2007, 09:31 PM   #1
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Registered: Jan 2007
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Openswan/Cisco PIX: NATting a VPN Tunnel

My challenge:

I have two sites that need VPN connectivity. One site runs a Linux router (Openswan) and the other site runs a Cisco PIX 501. Both sites use the private network scheme:, and cannot be changed at this time (Unfortunate, I know). Ideally, in our situation, the Linux box would NAT the VPN traffic, but the research I have done suggests that is not possible. Does anyone have any experience with this? Can it be done this way?

Old 01-28-2007, 09:13 PM   #2
Registered: Mar 2003
Location: Cambridge, MA, USA
Distribution: Ubuntu (Dapper and Heron)
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If you want to do NAT and Openswan on the same box, you need a fairly new kernel (2.6.17 IIRC). In one setup, after some experimentation we upgraded a box to 2.6.18, and talked sucessfully to the Cisco ever after.

BTW, there are very knowledgable and helpful people on



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