[Bridge] Bridging troubles

Stephen Hemminger
2008-02-27T19:34:21Z

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.