From owner-freebsd-net@FreeBSD.ORG Sat Dec 17 19:00:50 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4463516A41F for ; Sat, 17 Dec 2005 19:00:50 +0000 (GMT) (envelope-from sam@errno.com) Received: from ebb.errno.com (ebb.errno.com [69.12.149.25]) by mx1.FreeBSD.org (Postfix) with ESMTP id F3EDC43D5E for ; Sat, 17 Dec 2005 19:00:48 +0000 (GMT) (envelope-from sam@errno.com) Received: from [10.0.0.192] ([10.0.0.192]) (authenticated bits=0) by ebb.errno.com (8.12.9/8.12.6) with ESMTP id jBHJ0mA8024464 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 17 Dec 2005 11:00:48 -0800 (PST) (envelope-from sam@errno.com) Message-ID: <43A46023.6090509@errno.com> Date: Sat, 17 Dec 2005 10:59:47 -0800 From: Sam Leffler Organization: Errno Consulting User-Agent: Mozilla Thunderbird 1.0.7 (Macintosh/20050923) X-Accept-Language: en-us, en MIME-Version: 1.0 To: nielsen@memberwebs.com References: <20051216235743.E0E1A70DDA4@mail.npubs.com> In-Reply-To: <20051216235743.E0E1A70DDA4@mail.npubs.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-net@freebsd.org Subject: Re: Multicast packets dropped on atheros wireless link X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Dec 2005 19:00:50 -0000 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