Date: Tue, 22 Sep 2009 08:55:22 -0400 From: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> To: Cassidy Larson <alandaluz@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Random Network Drops on Realtek Interfaces (re) Message-ID: <1253624122.1321.9.camel@RabbitsDen> In-Reply-To: <d88efacd0909212225h3a301386p1446bc65a8b43cc9@mail.gmail.com> References: <d88efacd0909212225h3a301386p1446bc65a8b43cc9@mail.gmail.com>
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On Mon, 2009-09-21 at 23:25 -0600, Cassidy Larson wrote: > All, > > I've been experiencing an intermittent issue with a drop in networking > connectivity on a couple of boxes. > > At random times I drop connectivity between the servers and their > gateway. I am able to login via the secondary interface and > "/etc/netstart" and everything starts behaving as normal. My switch > shows the link is up, ifconfig shows the link is up, but I am unable > to ping my gateway until running "/etc/netstart". Somedays it'll > happen a few times an hour, some days once every 8-10 hours. It really > is intermittent, and driving me crazy trying to track down the issue. > I've tried different cables, switches, gateways, IPs, and locations. > Memtest for 5 days showed no errors. However, the same problem exists > on two separate installs at different times. I am able to connect to > the one server from the second via their secondary interfaces, so the > problem isn't related to both network interfaces. > > Both servers have the Supermicro X7SLM-L motherboard, same CPU, RAM > and disks. Using the Realtek network driver (re). pciconf shows: > vendor = 'Realtek Semiconductor' > device = 'Gigabit Ethernet NIC(NDIS 6.0) (RTL8168/8111)' > class = network > subclass = ethernet > > I've experienced the problem for some time now on both 7.2-RELEASE and > 7.2-STABLE (09/20/09) using amd64. > > Any help or suggestions would be useful in getting to the bottom of this. I do not know how applicable this is in your case, but I have seen such behavior when speed auto-negotiation was allowed on the box connected to the Cisco switch. Condition was usually triggered by the certain volume of traffic (e.g. system could be fine for weeks with SSH/telnet/X11 and lose interface when someone sends large file over FTP or SCP). Restarting the interface, usually fixed it for a while. In my case it was platform-agnostic causing me to have a cheat-sheet on how to disable auto-negotiation on AIX/Solaris/Linux/etc. -- Alexandre Kovalenko (Олександр Коваленко)
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