[OpenWrt-Devel] WDS and broadcast/multicast?

[Jeremy Kerr]

Hi all,

[sending this to -devel, as I haven't had any response on -users, hope 
this is okay]

I've recently set up WDS between two WRT54Gs (one v2 and one v4).  
However, with WDS enabled it seems that wireless clients aren't 
receiving broadcast or multicast packets.

Some details:

 * Both WRTs are running 8.09.1, bcrm-2.4
 * There are wired hosts connected to both WRTs
 * There are a few wireless clients
 * Wireless is WPA/PSK

If I do a broadcast ping from the wired network, only other wired hosts 
will see the ping. However, this *includes* wired hosts on the other 
side of the WDS link. Wireless hosts do not see any ping packets. Same 
applies for UDP packets sent to the local broadcast address, as well as 
mutlicast packets.

If I do a broadcast ping from a wireless client, the wired hosts see the 
packet as expected.

If I disable WDS (and turn off the WDS-connected WRT, because it's now 
isolated from the network), then wireless clients are able to see the 
broadcast packets. ARP seems to work fine in both cases though.

Is this a known issue? Or perhaps a mistake in my configuration, or is 
there something I need to do to enable to allow broadcast and multicast 
packets to be sent on the wireless network?

I've included /etc/config/wireless for both WRTs below. Let me know if 
there's any other information that might assist.

Any help would be much appreciated, this has got me stumped :)

Cheers,


Jeremy

 /etc/config/wireless -

config wifi-device  wl0
option type broadcom
option channel  5

config wifi-iface
option device   wl0
option network  lan
option mode ap
option ssid ssid
option encryption psk
option key  key

config wifi-iface
   option device   wl0
   option network  lan
   option mode wds
   option bssidMAC-of-other-WRT
   option ssid ssid
   option encryption psk
   option key  key


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Re: [OpenWrt-Devel] WDS and broadcast/multicast?

[David A . Bandel]

On Sat, Aug 1, 2009 at 19:49, Jeremy Kerrj...@ozlabs.org wrote:

Hi all,

[sending this to -devel, as I haven't had any response on -users, hope
this is okay]

I've recently set up WDS between two WRT54Gs (one v2 and one v4).
However, with WDS enabled it seems that wireless clients aren't
receiving broadcast or multicast packets.



Have you reviewed the /proc filesystem?  Check the wireless interfaces for 
/proc/sys/net/ipv4/conf/wireless_interface/mc_forwarding nad 
/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

Ciao,

David A. Bandel
--
Focus on the dream, not the competition.
   - Nemesis Air Racing Team motto
Visit my blog at: http://www.pananix.com/cgi-bin/blosxom




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