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Multiple PAT sessions overloaded on WAN can't connect VPN Server

Hi Guys,

I have problem in VPN connectivity with PAT overloading. Can anybody suggest what could be the issue?

I have a 2800 Cisco router. I have done PAT with Public WAN IP for entire private LAN Pool. LAN users are dialing a Public VPN server and not able to establish the VPN. One thing I have noticed that very first connection to the Server is being established but the second connection from the LAN is not getting through... It looks like VPN server is accepting only one connection from a Public source IP. Since I am PATing, so always my source is same.....

But I have done another test by using a very low end home use WIFI router and done the PAT... It's working with this router. I am able to connect multiple LAN PC with VPN Server.....

Do I need to put some special commands on my CIsco router which would allow multiple TCP connection to the VPN server?

Note :- 1.No VPN config in router. VPN client is installed at each PC.

2. VPN Server is a public server and I don't have the management access.


Posted by WebUser Zahid Khan from Cisco Support Community App

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