(Note: This message was posted as part of the "Ask the Expert" Event on IOS Feature Navigator that took place September 24 to October 5. Feel free to respond to or form discussions around this question)
tgonzales - DATA NETWORK ENGINEER, ULLICO
We are using a VPN 3000 concentrator to connect remote sites to our corporate network. They are using DSL and AT&T dial up. We are connecting them to an AS400. Screens are slow to pull up and frequent disconnects are taking place. If they dial in using RAS there are no slow downs using the same AS400 Connection. (Could the VPN "header changes" cause the as400 to inspect the packets closer when using the vpn?) Do you have any suggestions? The only thing that I can attrib to the slowdown is the fact that we are using compression (56bit w/3com nic handles compression onboard) and changing external addresses to private internal addresses.
Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen
If anyone else in the forum has some advice, please reply to this thread.
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