3Com VPN problem - Terminal server, citrix SQL traffic slow or fails
Posted on 2009-02-18
Hi, I have been searching the KB but I have not found an answer.
I have 3 3Com routers. Network A, (corporate headquarters) is an MSR20-40 with several connections.
Branch office 1 i(Network B) is connected with a Point to Point t-1 between the MSR20-40 at network A and 3Com 30-16 at network B. This connection works perfectly. It is fast and reliable. It is used to connect SQL, Citrix, and Exchage servers to clients at the branch office.
Branch office 2 (Network C) is connected via a VPN tunnel. The router at Network C is a 3Com 30-40. The endpoint of the tunnel at Network C is a DSL connection. The endpoint of the same VPN at Network A is the ethernet 1 interface. The tunnel is used for the same services as the point to point t-1 between Network A and Network B (SQL, Citrix, Exchange)
The problem that I am having is that the connection between Network C and my Citrix Server at Network A will intermittantly become slow or timeout. The same is true for RDP traffice to the same Citrix server. If I force the traffic to not use the VPN tunnel by tweaking DNS, it will work fine. If I connect to a different server at Network A using RDP, it will work fine. Also, lately I have had users experience timeouts connecting to the SQL server at Network A. It seems as though the problem is only happening through the VPN tunnel.
3com tech support is a bit stumped and they are investigating possible QOS issues. (I have QOS rules in place to expidite Citrix traffic).
Has anybody had any experience with intermittant issues on a 3Com VPN like this?
I can supply router configs & visio drawing if necessary.