On Wed, 22 Aug 2007 15:36:30 -0700 (PDT) wang dengyi <dy_wang@xxxxxxxxx> wrote: > Hi, > > We have a simple bridge setup but the ping (and other > network traffic) does not work reliably. After tracing > the code, it looks like a software bug. Since bridge > software is been running by thousands of people. I > guess I am wrong. Anyway, here is the problem. > > There are 2 boxes and each one has 2 interfaces, 1 > ethernet and 1 wifi. STP is enabled for the bridge to > avoid the loop. So the box 1 has wifi in the blocking > mode. When we ping from box 1 to box 2, lots of > packages lost. Ping from box 2 to box 1 does not has > this problem. > > After we tracing the code, we noticed that the box try > to using wifi to send the packages which is in > blocking mode. This happens because the ath0 is > returned from the forwarding database. It's > implemented in __br_fdb_get(br, dest). > > >From the etherreal, I noticed, that the STP package is > broadcast from the box 2. From the function > br_handle_frame(), if a stp package is received, it > will update the forwarding database. Since the STP > package is sent/received by both interfaces, the wifi > (blocking) received the package and update the > forwarding database too. So, __br_fdb_get() will > returns the wifi card sometimes. And then, the package > is lost. > > Regards, > > Dengyi Wang What kernel version are you using? Bridging over wifi doesn't usually work unless the wifi driver has WDS support. In wifi when bridging the driver would need to add an additional header that gives intermediate hop information: See: http://www.cisco.com/en/US/docs/wireless/access_point/1300/12.2_15_JA/configuration/guide/o13wds.html > > > > > > > > ____________________________________________________________________________________ > Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. > http://sims.yahoo.com/ > _______________________________________________ > Bridge mailing list > Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linux-foundation.org/mailman/listinfo/bridge -- Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx> _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
