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Vlan throughput

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Kernalx69

IS-IT--Management
Aug 12, 2004
16
SE
Hi

I have a Cisco pix 515e firewall and a Cisco Aironet 1242AG
in a network with several computers and servers.
I have made a vlan that the wirelss traffic should go through.
For wirelss users to connect to the wired network they must go through the firewall.
All traffic i allowed for now.
Everything works fine except that the throughput is very bad in some cases.

If i take a wireless computer and download a big file (100MB) from a wired server 2000 and i measure the speed , the speed shows about 10 Mbit/s.
But if i make the same test to a Windows 2000 pro on the wired network it shows 22 Mbit/s.
It doesn't matter where i put the Accesspoint in the network the result is the same.

If i insted make the same test with a switch that i configured to the Vlan3 and connected a computer to it.
The measurement to the server shows 70 Mbit/s , and to the windows 2000 pro 60 Mbit/s.
As you can see in this case it is faster to the server.

If i don't use vlan the speed is ok.

Why is it like this?
What should i do ?
I wounder could it have something to do with MTU size or Tcpwindow size ?

Please help !

Best regards
 
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