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VPN backup link is very slow??

By mikeindo ·
Customer has remote office connected to main office via T1. Remote office users authenticate to Active Directory Domain Controller at main site. Everything works fine over T1. Site-to-site VPN configured as backup link (500k link supplied by cable company) on same routers the T1s terminate on. It works but is VERY slow - seems to take five minutes to log in and continues to be slow after login. So, it actually does work (can ping across VPN by name and IP). Is DNS the issue? One suggestion was to set an Lmhosts file on the workstation pointing to DC, but it didnt help. Customer is not going to place DC at remote site. No errors in Windows event logs. Adjusted MTU sizes on Cisco routers (the devices terminating VPN) but also didnt help. No roaming profiles in use.

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