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Cannot connect to a corporate network with AT&T VPN Client through a Linksys router WRV54G

Posted on 2005-04-16
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Last Modified: 2008-02-07
Hi,

I have a network for my small business at home. I have a Linksys router WRV54G with three Apple computers working perfectly. My wife works for IBM and she works from home many times. IBM includes in their corporate laptops an AT&T VPN client. When this computer is connected directly to Internet, she can connect to IBM corporate network without problems. When she is behind of my firewall, she can't.

To avoid this problem I gave to the IBM laptop computer a fixed IP address and I have created a DMZ with this host in the firewall. Now it is working, but this computer is not protected.

I have tried many changes in the firewall set up without success. I have open the port 80, 500 and several more and nothing happened. The VPN tunnels are opened in the firewall as well. Everything in the firewall seems to be correct.

I have read that the release of AT&T VPN client that my wife is using is prepared to run behind a NAT/firewall device. I have also seen a file called NCSetup.ini in the VPN client folder with some entries talking about firewalls. Is there any set up to change there?

Thanks in advance for your help,

Guillermo
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Question by:gacilu
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Author Comment

by:gacilu
ID: 13815422
Hi,

The problems are more now. My wife is connected to the corporate network inside of the DMZ, but the network printer is outside of the DMZ, behind of the router. So my wife cannot use printer with my workaround.

Does anybody have an idea?

Thanks in advance for your help,

Guillermo
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Author Comment

by:gacilu
ID: 13822504
I have disabled the DHCP in the router and still cannot connect the VPN client to the corporate network. Only when the computer is in the DMZ.

Anybody knows what ports do I need to open to allow AT&T VPN client works through a firewall?
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Expert Comment

by:chad
ID: 13842446
when the pc is behind the router, can she access the internet?
If IBM gave her the equipment, I would recommend contacting her employment help desk to ensure the device is configured properly.  A large corp like IBM should have it preconfigured. But, they may have further configuring to do on their head end VPN servers.

Have you checked the routing tables on the device?  I am guessing the trusted side or tunnel routing is not configured.
What about NAT configurations?
If she can access the corporate network without using the vpna...

hope some of this helps
good luck
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Author Comment

by:gacilu
ID: 13843224
Hi,

I have solved the problem changing the protocol in the VPN from IPSec to SSL in the AT&T client.

It is my first question here. How should I close it?

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Expert Comment

by:chad
ID: 13851892
no objections at all... glad to see the issue resolved... :-)
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