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Firewall blocking vpn traffic

Posted on 2012-04-02
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Last Modified: 2012-07-13
Hi

We have an intercampus VPN managed by a new company and we are in the process of migrating the current system to the new one.

My current system used an ipsec vpn between campuses and is a clearOS (centos) system. We had a server running the clearOS OS at every campus and then used the built in ipsec vpn to connect them.

The new system is managed by a 3rd party with cisco routers. Basically all campuses connect to the same network with the cisco routers and there is a single breakout point at the 3rd party offices to the outside.

My servers seems to be blocking the VPN traffic. If I switch off the firewall everything is fine but if it is one I can only connect to the actual servers and no other PC's on the campus LAN. They do provide a firewall so this question is more about me being curious than critical. My servers are to become file servers only so the firewall is not a big issue but if possible I would like to have the option.

Here is the setup:
Network layout
A traceroute from within campus 01 shows the problem to be the eth0 NIC on the server. Everything stops at 10.70.21.2. I can ping and access samba on 192.168.0.1 (the server) but not on other PC's in that network. I specifically need to get to 192.168.0.254.

As I said before when I switch off the firewall at campus 02 I can access everything and the VPN is fine.
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Question by:QuintusSmit
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Accepted Solution

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andrew1812 earned 1600 total points
ID: 37799421
What is the default gateway configured on the PC's on the 192.168.1.0 network. It should be the IP 192.168.0.1.

Also try this test.

Install wireshark on any of the PC's in the 192.168.1.0 network. (Ex: PC with IP 192.168.1.2)

ping 192.168.1.2 from campus 1

In th wireshark capture check if you are able to receive the ping request triggerred from campus 1 and if a response is being sent out. If a response is not being sent out, then it would be the gateway issue.
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Author Comment

by:QuintusSmit
ID: 37799447
ok- will do that and report back. I can only do it at night when everyone has gone home so wil try it tonight.
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Author Closing Comment

by:QuintusSmit
ID: 38183253
Suggestion of using wireshark was a good one. In the end though the problem was on the side of the service provide. This is bit technical for me but turns out the package sizes used by clearOS was not compatible with their system which caused things to go in a loop on their side
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