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VPN clients behind NAT boundary

Recently, our PIX-525 was upgraded from v6.3.5 to v.8.0.4. Since the upgrade, the PIX no longer allows connections from remote access clients that are behind a NAT boundary. Most of our clients are running WinXP or Vista.

I have entered the 'cry isa nat-t 60' command, but connections are still not allowed. Remote access is working correctly for all clients who are not behind a NAT boundary, so the issue is definitely with NAT traversal.

Below is my DefaultRAGroup setup. I am sure that it is something I am mising with reagrds to the new commands present in version 7.0 and above, as I am only used to working with v6.3.

tunnel-group DefaultRAGroup general-attributes

address-pool remote-pool

authentication-server-group (outside) RADIUS

default-group-policy 2

tunnel-group DefaultRAGroup ipsec-attributes

pre-shared-key *

tunnel-group DefaultRAGroup ppp-attributes

no authentication chap

no authentication ms-chap-v1

authentication ms-chap-v2

1 REPLY

Re: VPN clients behind NAT boundary

You need to allow UDP4500 - NAT-T port thru your NAT boundry.

If you are using any other port or ever ipsec-over-tcp, you need to allow that port thru.

HTH>

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