Date: Sat, 17 Dec 2005 10:59:47 -0800 From: Sam Leffler <sam@errno.com> To: nielsen@memberwebs.com Cc: freebsd-net@freebsd.org Subject: Re: Multicast packets dropped on atheros wireless link Message-ID: <43A46023.6090509@errno.com> In-Reply-To: <20051216235743.E0E1A70DDA4@mail.npubs.com> References: <20051216235743.E0E1A70DDA4@mail.npubs.com>
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Nate Nielsen wrote: > Certain multicast packets are not making it through an Atheros based > 802.11 wireless link. Other drivers/cards (ie: wi) work fine. > > Two boxes sitting next to each other running FreeBSD 6.0. The cards are > set up simply: > > ifconfig ath0 inet 172.28.2.18/30 ssid tel2 channel 52 \ > mediaopt adhoc > > An OSPF daemon is running on both sides of the wireless link, causing > multicast packets to be sent over the ath0 NICs on both boxes. The > multicast packets link local multicast (ie: not routeable multicast). > Although I'm using OSPF it seems any multicast packets would have the > same behaviour. > > Running 'tcpdump -pnti ath0' on the first box (which indicentally is the > BSSID for the adhoc link) shows packet pairs like this: > > >>IP 172.28.2.18 > 224.0.0.5: OSPFv2, Hello, length: 48 >>IP 172.28.2.17 > 224.0.0.5: OSPFv2, Hello, length: 44 >>IP 172.28.2.18 > 224.0.0.5: OSPFv2, Hello, length: 48 >>IP 172.28.2.17 > 224.0.0.5: OSPFv2, Hello, length: 44 > > > These are packets from both OSPF daemons showing up on the ath0 NIC. > This is the expected behaviour. > > However running 'tcpdump -pnti ath0' on the second box we see only: > > >>IP 172.28.2.17 > 224.0.0.5: OSPFv2, Hello, length: 44 >>IP 172.28.2.17 > 224.0.0.5: OSPFv2, Hello, length: 44 > > > The packets from the BSSID box never make it over the wireless link. > > FWIW, setting up the two boxes as hostap/client mode doesn't fix the > problem. The multicast packets from the hostap box aren't received on > the client. > > Any ideas on where I should poke around? wlanstats, wlandebug input. Sam
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