Hi All,
I am facing some very interested problem with the Linux bridge. Let me explain 
you the setup first:
wireless STA           AP       Managed switch         ========            ==== 
     ============|              |_______|      | ___|                       |  
____DHCP SERVER|              |            |      |       |                     
  |========           ====        ============
Bridge on AP is 
br100 = > eth0.100               ath0.100
So here in this setup station is sending DHCP Discover to AP which is received 
on ath0.100 interface of bridge and it forwards that request to eth0.100. 
eth0.100 adds its vlan tag and forward this request to a managed switch which 
can understand vlan tags. then this this switch removed vlan tag and forwards 
this request to DHCP server. DHCP server then replied to it with DHCP offer 
packet. DHCP offer is s Broadcast packet. This offer packet is received in 
eth0.100 but some how it is not forwarded on ath0.100 so that station can also 
get this. I have verified it by using ethereal that DHCP offer packet is coming 
to eth0.100 interface but it is not received in ath0.100. One more thing, this 
is not happening everytime. This is happening sometime only.
So My problem is that like why bridge is not forwarding this DHCP offer packet 
to ath0.100 sometime. Can any body help me on this. Do let me know if you want 
any other detail about setup.
With Regards 
Rahul Bhardwaj 

 


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