Re: Possible bug in the Bridge-utils/HostAP driver

From: Terry Hardie (
Date: 2002-06-24 04:18:09 UTC

On Mon, 24 Jun 2002, Manjunathan PY wrote:

> Hi,
> I have setup a bridge between wirless LAN and Wired LAN as shown below
> (Bridge Br0 on Linux box)
> ____________________
> | |
> station....air if....wlan0---HostAP---eth0---wiredLAN---Proxy---internet
> |____________________|
> I am not able to browse the internet from the station. I used ethereal on
> the HostAP linux box (which is also acting as bridge )
> to monitor the http request, I noticed that http request reaches the
> internet Proxy server. But the station is not able to receive any packets
> from the internet proxy.
> Note: I used bride-utils by Lennert Buytenhenk to setup the bridge in the
> linux box , I am using Prism2 HostAP driver.
> Route table is as follows
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> * U 0 0 0 br0
> loopback * U 0 0 0 lo
> default UG 0 0 0 br0
> Can any one please explain why I am NOT able to browse the internet? The
> browser used to display "Connected to ..." and thats it. No
> further response at all.
> After a lot of struggle, I figured out that if I set the MTU size (Maximum
> Transmission Unit) to anything less than 1400 bytes in the Station, I was
> able to browse the internet.

I am running this exact configuration, and it works fine. I have heard of this problem on other access points (Specifically the linksys AP 2.5), and there is somehow a relationship with encryption and encryption size. It should work if you turn off encryption, but I don't know what the root cause is.

As I said, I'm running with 128 bit encryption and bridging, and everything works fine.

Terry Hardie
SHOUTip Engineering Product Manager		ICQ#: 977679, 6530 Paseo Padre Parkway
Mailstop #2207, Fremont, CA 94555, USA		V: +1-510-574-2366

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