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VPN Client!!!

Posted on 2003-10-21
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Last Modified: 2013-11-16
Hi there,

I'm using a VPN Client to connect into my school's server. I can get connected without any problem. However when i check the statistics for the incoming packets decrypted it says 0. I believe something is blocking the packets. I have a pix 501 at my house. Do you think this could be the reason? Do you have any suggestions?

Thanks for your help.
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Question by:mdiez
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birksy earned 125 total points
ID: 9595053
Hi,

Given that you've a 501 at home I'm assuming that as you traverse your firewalls interfaces you're going through a private/public address boundary and hence the VPN server at the other end has to support client NAT.

Cisco typically use port 10000/UDP to create the network transport when your client is on a private address, but without knowing what sort of VPN server you're connecting to (e.g. Nortel, Symantec, Cisco) or for that matter whether you're using PPtP or IPSEC (or even an SSL VPN) it's immaterial. Let us know what sort of device you're connecting to and we'll go from there.

In the meantime here's a good place to start looking in terms of passing IPSEC VPN traffic through your firewall:

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008009486e.shtml

R.
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by:mdiez
ID: 9595630
Hi there,

Thanks for youe response. My school is running a VPN Cisco Server. And they are using IPSEC. Does this help, or you need more information.

Thanks for your help
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by:birksy
ID: 9603984
Since you're connecting to another Cisco box things become slightly more simple.

You need to consider opening the following on your Pix:

ESP (50/IP)
ISAKMP (500/UDP)
10000/UDP

You'll also need to configure your Cisco client to do NAT traversal using a UDP transport. The link that I posted above explains how to do the firewall side of this in some detail.

Let me know how you get on, any if you have further problems.

R.
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