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Wireshark-users: [Wireshark-users] Help With EPS/ISAKMP

From: "Josue Del Valle" <jodelvalle@xxxxxxxxxxxxxxx>
Date: Wed, 17 Jun 2009 16:16:04 -0400

Hi,

 

I was hoping someone could help me with this issue.   I have configured IPSec on two Windows 2003 servers using certificates as the authentication.  If I run wireshark from one of the server while having both servers on the same network, I can see a bunch of ESP which indicate to me that the traffic is encrypted between the two servers.  If I move one of the servers to another network (DMZ) and try to communicate with the server located on the trusted network, I can’t and instead of getting ESP packets all I see is  ISAKMP packets.  I have not change anything on the IPsec except the ip for the server that has been moved to the DMZ.  The trusted network as a 192.168.10.X subnet and the one on the DMZ is 192.168.20.X. 

 

If I remove IPSec I can communicate from the DMZ to the LAN as intended which indicate routing on the firewall is working fine.  I know it is kind of confusing, but I’m trying to figure out why WireShark shows ESP packets when the server is on the LAN and ISAKMP packets when the server is moved to the DMZ.

 

Thanks,

 

Josue

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