[Bridge] Bridging troubles

[Stephen Hemminger]

On Wed, 27 Feb 2008 19:07:37 +0000
George - <giorger at hotmail.com> wrote:

> 
> Hallo.
> I am trying to establish a bridge on my debian linux box between an ethernet and a wireless interface, in order to be able to connect to the bridge via my laptop's wireless. My laptop has WinXP.
> 
> Well, i have a bridge which i created by
> 
> brctl addbr br0
> brctl addif eth1 (Ethernet controller: Intel Corporation 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller (rev 03))
> brctl addif eth4 (Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01))
> 
> I am connected through eth1 to a router and I want to bridge this two connections in order to connect remotely from my laptop's wireless card which is an Intel(R) Wireless WiFi Link 4965 AGN.
> My last steps are to 
> 
> dhclient br0 
> echo "0"> /proc/sys/net/ipv4/ip_forward
> iptables -P FORWARD ACCEPT
> 
> I was able to connect from my laptop, and router's dhcp worked fine. But here my problems start. I tried to ping my linux box and i was successful. I captured arp, dhcp packets. But when I am trying to ping my router (from my laptop), I fail. I try to catch packets with tcpdump -i br0 -vvvv|grep laptop_ip but it seems as if packets never get to my linux box. I found out about some kind of shapping so i also tried the following
> 
> for f in `ls /proc/sys/net/bridge/`; do echo "0"> /proc/sys/net/bridge/$f ;cat /proc/sys/net/bridge/$f;done
> 
> but no good. My linux box can access Internet with no problem. My cards are ok, since the same configuration with a WinXP box (instead of debian) works.
> Are there any ideas?
> 
> Giwrgos
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Forget the /proc futzing that isn't your problem.
  http://www.linux-foundation.org/en/Net:Bridge#FAQ

The problem is that wireless is not the same as Ethernet as far as bridging.