Linux Ethernet Bridging - Sep 2008 - [Bridge] bridge is not forwarding the packet <Urgent, Please reply ASAP>

Hello to all,

I am stating my problem below in detail so that you all can understand it
properly.

I am having setup of Linux box. In that box I am having one Ethernet interface
eth0 and one wireless interface ath0. I have also configured one vlan port as
eth0.100 with the help of vconfig (vconfig add eth 100).? Now I have created two
bridges br1 and br100. I have added eth0 into br1 so br1 is having only one
interface. I have added ath0 and eth0.100 into br100. Physically eth0 is
connected to a switch which is configured to handle vlan 100. DHCP server is
also running into that switch to provide IP address to wireless stations. This
is all about my setup.

After this I am associating one wireless station with the ath0. After successful
association station issues a dhclient to get ip address, which reaches to ath0
interface of my Linux box. ath0 bridges that request to eth0.100. Now eth0.100
adds it's vlan tags and forward that request to the switch. Because switch
is configured to support vlan 100, so it process the dhcp request and send back
the dhcp response with vlan tag 100.

Now I don't know but this response is not reaching to ath0. I have putted
wireshark and figured out that those dhcp responses are reaching on eth0 and as
eth0 is part of br1 so this packet is reaching to br1 which is just discarding
them all. So the wireless station is not getting the ip address. According to me
eth0 should give these packets to eth0.100 port instead of br1. Or what I mean
to say first vlan handling should be done priror then? bridge handling. Do I
need to change something into Linux kernel for that or there is some other
problem with my setup?

Can anybody help me in this? If anybody want more detail I will provide. I am
using Linux 2.6.15 kernel. Any kind of help will be much appreciated.


With Regards 

Rahul Bhardwaj 

?


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On Mon, 22 Sep 2008 16:24:00 +0530 (IST)
rahul bhardwaj <rahul_bhardwaj36in at yahoo.co.in> wrote:
> Hello to all,
> 
> I am stating my problem below in detail so that you all can understand it
properly.
> 
> I am having setup of Linux box. In that box I am having one Ethernet
interface eth0 and one wireless interface ath0. I have also configured one vlan
port as eth0.100 with the help of vconfig (vconfig add eth 100).? Now I have
created two bridges br1 and br100. I have added eth0 into br1 so br1 is having
only one interface. I have added ath0 and eth0.100 into br100. Physically eth0
is connected to a switch which is configured to handle vlan 100. DHCP server is
also running into that switch to provide IP address to wireless stations. This
is all about my setup.
> 
> After this I am associating one wireless station with the ath0. After
successful association station issues a dhclient to get ip address, which
reaches to ath0 interface of my Linux box. ath0 bridges that request to
eth0.100. Now eth0.100 adds it's vlan tags and forward that request to the
switch. Because switch is configured to support vlan 100, so it process the dhcp
request and send back the dhcp response with vlan tag 100.
> 
> Now I don't know but this response is not reaching to ath0. I have
putted wireshark and figured out that those dhcp responses are reaching on eth0
and as eth0 is part of br1 so this packet is reaching to br1 which is just
discarding them all. So the wireless station is not getting the ip address.
According to me eth0 should give these packets to eth0.100 port instead of br1.
Or what I mean to say first vlan handling should be done priror then? bridge
handling. Do I need to change something into Linux kernel for that or there is
some other problem with my setup?
> 
> Can anybody help me in this? If anybody want more detail I will provide. I
am using Linux 2.6.15 kernel. Any kind of help will be much appreciated.
> 
> 
> With Regards 
> 
> Rahul Bhardwaj 
Full bridging to wireless requires WDS which Linux wireless does not support
(yet).

http://www.linuxfoundation.org/en/Net:Bridge#It_doesn.27t_work_with_my_Wireless_card.21