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New Member

Tunnel Established but no traffic

Hi,

Firstly my network setup is as follows. I have a PIX with vpn configured using RSA secure id tokens. I use the cisco vpn client utility to connect over a 2 day satellite. No this solution has been working fine until we made a slight change. We got an hughes DW4020 unit which give us a 4 port ethernet interface to the satelite instead of usb.

So basically what has changed is that this unit is doing NAT from a single 144.x.x.x to the hosts on 192.x.x.x. The VPN tunnel gets established and authentication is working. The VPN clients get internal IP's and everything but after that no traffic is received through the vpn.

So I am wondering what effect the NAT is having on things? Can someone explain to me what actually happens with vpn and nat and how i might debug/fix it?

Thanks in advance.

1 REPLY
New Member

Re: Tunnel Established but no traffic

It sounds like you need to implement nat-transparency. enter the following command into your pix:-

isakmp nat-traversal 20

Regards,

Rowan

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