help urgently needed!

Saber Zrelli zrelli
Sun Mar 2 04:03:06 PST 2008

Hi Sven,

Your problem could be caused by the bridge setup. Have you tried using NAT ?

> hi everyone,
> we are supposed to roll out about 20 new access points on our first test
> site in a few days, however, I haven't quite got them working yet.
> The APs are small Alix mainboards equipped with two Atheros miniPCI
> cards (madwifi driver). System is minimal Debian stable.
> bridgeutils version is 1.2
> hostapd version is 0.5.5
> (both from stable debian package)
> The current major problem at hand is as follows:
> Most important scenario for this test site is this:
> Asterisk Voip server <--> AP <--> Mobile SIP client (Nokia E65 / E51)
> (Everything in one LAN)
> We are using a bridge setup, with e.g. br0 containing eth0 and ath0 on
> the APs.
> Using no, WPA, or WPA2 encryption (with PSK) the mobile clients connect
> with no problem, they register to Asterisk Voip server, I can start a
> call, I can browse the internet on the mobiles, too.
> However, using CCMP algorithm in hostapd I cannot ping or reach the
> mobiles, neither from LAN nor from AP directly, but mobiles can reach
> PCs behind AP (wired) with no problem.
> Using no encryption, everything is _almost_ fine. Ping loss pinging the
> mobiles is about 6% at most.
> Using TKIP, it seems to work at first, like with no encryption (network
> reachable from both sides of AP), but after a few calls (udp
> connections), it is the same as with CCMP. Mobile clients can reach the
> net without problems, but the wireless clients are not reachable through
> the AP.
> And finally the weirdest: as long as call is actively transmitting
> (active UDP connection), the mobile client is fully reachable! with no
> ping loss at all, no matter what encryption is used! But, it vanishes
> instantly when the call ends.
> I wrecked my brain for 3 days now, it might be something with mtu sizes
> different for eth0 and ath0 (1500 vs 2290) it might be related to MAC
> addresses, it might be something totally different.
> Any help greatly appreciated, really! ;-)
> I can compose detailed information and logs instantly if someone thinks
> he might know the solution to this.
> Best Regards
> Sven Nielsen
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> HostAP at

Saber Zrelli

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