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VPN Download Speed Slow

Posted on 2004-08-25
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Last Modified: 2008-01-16
My effective download speed off most websites is 52+ KB/sec, which is acceptable.  However, my VPV connection effective download speed is 5-7 KB/sec. with my firewall and antivirus software shut off.  All other users, all using Win XP and braodband, have download speeds of 50+KB/Sec., some as high as 135 KB/Sec.

My connection config is:
Win 2k Client ->Cisco VPN Client v 4.0.03(F)->Westell 2100 WireSpeed Dual Connect Modem->Verizon DSL(ISP)->T1 connection (2Mb/sec -no up/down split)->Cisco PIX 501 firewall with VPN firmware v 6.3(3)

I made the following registry changes that did not help:

HKEY_LOCAL_MACHINE/system/currentcontrolset/control/class/ Cisco Systems VPN Adapter:
      DriverDesc, VAMaxMTU = 1000 (it was 1500)
      MaxFrameSize of type DWORD = 1000

Any suggestions?
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Question by:drippin
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Author Comment

by:drippin
ID: 11901621
The slow download speed is even with no other users using the VPN connection.
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Accepted Solution

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grblades earned 500 total points
ID: 11902105
There is a SetMTU utility that comes with the Cisco VPN client when it is installed. Can you have a look to see what the interface is set to?
I think it is normally set to 1300 but you could try lowering it even furthur to around1200.
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Author Comment

by:drippin
ID: 11915041
I tried lowering the MTU to 1200, 1100 & 1000 using SetMTU, but none of theose setting helped.  I wonder if the VAMaxMTU setting in the registry is related.  I had changed it from 1500 to 1000, but it did not help.

I was not able to ping the host after I made your suggested change, so I reinstalled the VPN client.  I noticed that this install I had to add NetBEUI manually.  I was able to ping the host after I added it.  Browsing and downloading files are still very slow.

Thanks,
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LVL 36

Expert Comment

by:grblades
ID: 11918088
Why are you using NetBEUI?
It is an old protocol that can only be used on your local network.
Perhaps you mean NetBIOS?
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