Wireless Vlan Throughput

[kernalx69]

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 or 2003 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 a port to the Vlan and connect 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 to both server and workstation.

Why is it like this?

What should i do ?

[smalkeric]

Purpose of VLANs

Wireless LANs (WLANs) use VLANs to provide the following functions:

Segment traffic into distinct broadcast domains or IP subnets

Create separate security domains for various security models (Open, WEP, LEAP, PEAP, and EAP-TLS).

http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_chapter09186a00802a0a05.html

[kernalx69]

Thanks for your answer.

I know the purpose of Vlans.

And i am going to use it for more security.

But the problem is that then i am using wireless vlan i am getting much better throughput to a wired workstation than to a wired server 2000 or 2003.

It doesn't matter if i install a new server or a new workstation the result is the same.