From owner-freebsd-net@FreeBSD.ORG Fri Dec 19 18:09:30 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 695F71065673 for ; Fri, 19 Dec 2008 18:09:30 +0000 (UTC) (envelope-from chodong2003@yahoo.com) Received: from web58407.mail.re3.yahoo.com (web58407.mail.re3.yahoo.com [68.142.236.175]) by mx1.freebsd.org (Postfix) with SMTP id F02578FC12 for ; Fri, 19 Dec 2008 18:09:29 +0000 (UTC) (envelope-from chodong2003@yahoo.com) Received: (qmail 96736 invoked by uid 60001); 19 Dec 2008 17:42:48 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type:Message-ID; b=NQql2jUJ8mbE31DGzXe5XDXTS/RcfiI4Fp3SRoeQW/t9kZFrEZHzKcUbzEnNBvV5vPValYSQeanxiO6CNtrqbWRCNyzpGzcJSMC0fdxya7denRpM5JYX8xWkkOQaSAZ6AKt4q2LJwx79PaM/2/8SYVYtncrCO50QzUVdWNRDwl4=; X-YMail-OSG: 2VFFXi8VM1nhJGu3ivmM_bdtWuJJiTkWf5alriOok4SkhmE7HhFAoRDVaN0xj587.3pQE5Tzg3duLfNmGf5iV2fKC1DhKmXJPHyQ4ml6VRd8p.KQ7XuJgH63FEAyp_xkNfCY8YERwfwSdQ_GOqhucJz_N6E- Received: from [64.169.74.198] by web58407.mail.re3.yahoo.com via HTTP; Fri, 19 Dec 2008 09:42:48 PST X-Mailer: YahooMailWebService/0.7.260.1 Date: Fri, 19 Dec 2008 09:42:48 -0800 (PST) From: richard lll To: freebsd-net@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Message-ID: <889762.96728.qm@web58407.mail.re3.yahoo.com> Subject: Packet Loss Under FreeBSD 7.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: chodong2003@yahoo.com List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Dec 2008 18:09:30 -0000 Hi, I am new to FreeBSD and I am developing a program that does heavy use of UDP multicast over the LAN. This program is incurring 90-100 percent packet loss on FreeBSD. Packet loss occurs even when a I send just 3 packets. When I send 1000 packets I get 100% packet loss. netstat on FreeBSD shows all the packets, but none/few make it to my program. The program is single-source for FreeBSD, Linux and Solaris and neither Linux nor Solaris has anything like this level of packet loss. I am running a generic kernel, Intel P4, 512MB. I use a quad port SUN HME card 100T. I can telnet, ftp, etc. just fine. My guess is something is misconfigured in FreeBSD. Does anyone know what I need to tune? Thanks, /cho