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IPsec Behind Nat

koaps
Level 1
Level 1

‎12-05-2003 11:35 AM - edited ‎02-21-2020 12:54 PM

I'm trying to setup an IPsec client behind common NAT firewalls(linksys, netgear, etc) and I can get most of the tunnel to build(ISAKMP passes, but IPsec fails)

When I'm behind a NAT firewall my L2TP doesn't authencate at all. When I'm in a public network I can authencate but I can't ping or connect to any internal servers.

Anybody know an PIX example that deals with dynamic ipsec clients behind a NAT device connecting to a PIX?

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mostiguy
Level 6
Level 6

‎12-06-2003 06:51 AM

Do MS's l2tp clients work behind NAT? If you use Cisco's client against a pix or a 3000 concentrator, I know you shouldn't have any problems

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koaps
Level 1
Level 1
In response to mostiguy

‎12-06-2003 12:00 PM

Not sure if L2TP works behind NAT, but I tried to use the Cisco VPN Client 4, it wouldn't find a matchin crypto set

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