Date: Mon, 26 Mar 2001 21:45:27 -0800 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: <deepak@ai.net>, <freebsd-questions@FreeBSD.ORG> Subject: RE: Network lockups on fxp0? Message-ID: <000101c0b681$206fad00$1401a8c0@tedm.placo.com> In-Reply-To: <MLEFIJIDEIDHLFKGNEILEEBHCFAA.deepak@ai.net>
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I'd start by looking at what is most common - your network hubs. You may have a failed hub that's trashing packets. Otherwise maybe someone is hitting you with a DoS attack? Ted Mittelstaedt tedm@toybox.placo.com Author of: The FreeBSD Corporate Networker's Guide Book website: http://www.freebsd-corp-net-guide.com >-----Original Message----- >From: owner-freebsd-questions@FreeBSD.ORG >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Deepak Jain >Sent: Monday, March 26, 2001 5:41 PM >To: freebsd-questions@FreeBSD.ORG >Subject: Network lockups on fxp0? > > > >This weekend we started seeing a bunch of new and stable machines (all >4.2-RELEASE) with varying levels of traffic (3mb/s to 15mb/s) withdrawing >their MAC addresses from the network layer: > >fxp0: SCA timeout >fxp0: DMA timeout >(repeating) > >or: > >fxp0: SCB timeout >fxp0: DMA timeout >(repeating) > >Reboots clear it, but the systems are completely responsive at the console. >The strangest thing is that of 10 machines that showed this over the >weekend, machines would lock up in pairs and singles. This, even though the >users on the servers were completely unrelated. 5 locked up in one data >center another 5 in a different one, no other servers anywhere had any >issues. > >These systems are all Tyan Thunder motherboards, with dual integrated sym >controllers (SCSI) and dual integrated fast ethernet (fxp) ports. 1GB RAM, >single and dual hard drives. The kernel's buffers and things are known good >well over 50mb/s and the kernel is identical across all of them as well as >400 other 4.2 machines. No single server has gone down twice yet, so I have >no idea of how long between occurrences. Occurrences don't seem to be >related to traffic flows or system load. > >Any ideas of where to track down these issues? > >Thanks, > > >Deepak Jain >AiNET > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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