Tcp/ip wireless throughput

[Kernalx69]

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

 

[dput]

Some of your issue may be the speed of your wired network vs the wireless network. Your wired network is probably running 100MBs. Wireless "G" networks are rated at 54MBs and I find that you don't usually get the rated speed out of wirelss networks. Based upon this, I don't find your numbers to be all that surprising. If speed is your primary goal, use wired connections.

Dan

 

[Kernalx69]

I know that.

But as you can see the highest number is 22 Mbit against a windows 2000 pro.
That speed should also be possible against a server.
I am satisfied with 22 Mbit through a 54 Mbit wireless network connection but i can not accept 10 Mbit.