From owner-freebsd-net Tue Jan 21 23: 2:12 2003 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 5C5D337B401; Tue, 21 Jan 2003 23:02:10 -0800 (PST) Received: from boris.st.hmc.edu (boris.ST.HMC.Edu [134.173.63.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7E22C43F3F; Tue, 21 Jan 2003 23:02:08 -0800 (PST) (envelope-from jeff@unixconsults.com) Received: from boris.st.hmc.edu (localhost [127.0.0.1]) by boris.st.hmc.edu (8.12.3/8.12.3) with ESMTP id h0M722Oo007849; Tue, 21 Jan 2003 23:02:02 -0800 (PST) Received: from localhost (jeff@localhost) by boris.st.hmc.edu (8.12.3/8.12.3/Submit) with ESMTP id h0M722qw007846; Tue, 21 Jan 2003 23:02:02 -0800 (PST) (envelope-from jeff@unixconsults.com) X-Authentication-Warning: boris.st.hmc.edu: jeff owned process doing -bs Date: Tue, 21 Jan 2003 23:02:02 -0800 (PST) From: Jeff Jirsa X-X-Sender: jeff@boris.st.hmc.edu To: "Jacques A. Vidrine" Cc: freebsd-net@FreeBSD.ORG Subject: Re: possible DoS in dc driver In-Reply-To: <20030121131442.GA59186@opus.celabo.org> Message-ID: <20030121225345.V7823-100000@boris.st.hmc.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Virus-Scanned: by amavisd-milter on boris.st.hmc.edu Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Tue, 21 Jan 2003, Jacques A. Vidrine wrote: > Looooong, loooong ago, someone reported a dc driver bug. However, > a couple of us have tried and failed to reproduce the problem. I > thought I'd bounce the issue here before completely forgetting about > it. I'm not seeing it on 4.5. MBUF exhaustion: yes, lockup: no. ( From a different machine) [10:51pm] jeff@snip (~) # sudo ping -f -s 50000 snip Password: PING snip (snip): 50000 data bytes .................................................... .................................................... .................................................... .................................................... .................................................... ^C (On the 4.5 machine) [10:52pm] jeff@snip (~) # ifconfig dc0 dc0: flags=8843 mtu 1500 inet snip netmask 0xfffff800 broadcast snip.255 ether 00:a0:cc:37:50:fa media: Ethernet autoselect (100baseTX ) status: active [10:52pm] jeff@snip (~) # uname -a FreeBSD snip 4.5-RELEASE-p1 FreeBSD 4.5-RELEASE-p1 #0: Fri Mar 1 15:09:01 GMT 2002 jeff@snip:/usr/src/sys/compile/snip_4_5 i386 [10:52pm] jeff@snip (~) dmesg -a | tail m_clalloc failed, consider increase NMBCLUSTERS value m_clalloc failed, consider increase NMBCLUSTERS value m_clalloc failed, consider increase NMBCLUSTERS value m_retry failed, consider increase mbuf value m_clalloc failed, consider increase NMBCLUSTERS value m_clalloc failed, consider increase NMBCLUSTERS value m_clalloc failed, consider increase NMBCLUSTERS value m_clalloc failed, consider increase NMBCLUSTERS value m_retry failed, consider increase mbuf value m_retryhdr failed, consider increase mbuf value The system does drop icmp echo requests, if that matters. - Jeff To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message