Dropping Connections (Verizon Aircard)

Hello, I have a user that is complaining that when he is logging on through the VPN using his Verizon aircard after a few min (various) he will get dropped. He says the aircard does not loose signal just the Cisco VPN client does. Any ideas on how to fix this? Thanks!!

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Check the setting for max TCP retransmissions and how many errors are occuring on wireless card:

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check for retransmission using command :

netstat -s

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How often this will happen depends upon how much the user is moving around. Generally, if the user is sitting at the park, you won't normally have disconnects with cellular wireless. If the user is moving/roaming, you can expect that there will be disconnects as connections or response timings change through cell handoffs, etc.

This is a pretty common experience. I see this more as an expected behavior with IPSEC VPNs like the Cisco VPN Client VPN concentrator or ASA. IPSEC is properly sensitive to the nature of the connection and to change. If you want to see more, put either/both ends into debug mode.

The alternative is to go to a system that is more geared to mobility by implementing proxy sessions on one end and connection recovery/persistence on the other end. It isn't spelled Cisco, however.

good luck.

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