VPN over SBC Yahoo DSL

Unanswered Question
Jun 17th, 2003
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Has anyone seen this before?

A user...is able to establish a tunnel from his Cisco VPN Client over a SBC/Yahoo DSL connection to our VPN 3005 Concentrator. He gets authenticaed and everything. However, once connected he can not pass traffic to our network.

Traffic from the inside is getting passed. If I watch his sessions stats on the concentrator while doing a costant ping the Tx bytes increase but the Rx bytes don't. As soon as I stop the ping all traffic stops.

His laptop works fine while connecting using hotel's high speed connections and a cable modem...he just can't connect via SBC. I would have thought that once the tunnel is up...he's home free.....

Any thoughts?

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sghosh Tue, 06/17/2003 - 10:02
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You are facing some MTU issues in the vpn client, try to use the "set mtu" utility in the cisco vpn client (Cisco Systems VPN client --> set mtu ) to reduce the MTU to 1400 and it should work fine.




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