Date: Tue, 13 Feb 2007 14:03:23 -0600 From: Greg Barniskis <nalists@scls.lib.wi.us> To: Matthew Pope <mpope@teksavvy.com> Cc: freebsd-questions@freebsd.org Subject: Re: Connection timed out Message-ID: <45D2198B.9020104@scls.lib.wi.us> In-Reply-To: <45D20B9C.8080602@teksavvy.com> References: <45CF9010.7040905@teksavvy.com> <448xf3hw0f.fsf@be-well.ilk.org> <45D20B9C.8080602@teksavvy.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Matthew Pope wrote: > I find that during the blocking behaviour, when I try and ping the > windows box, a tcpdump shows that each second ping attempt is followed > by a response (it appears) from an IPv6 address... > 13:30:51.066625 802.1d config 8000.00:30:19:53:05:00.8011 root > 8000.00:30:19:53:05:00 pathcost 0 age 0 max 20 hello 2 fdelay 15 > 13:30:53.069431 802.1d config 8000.00:30:19:53:05:00.8011 root > 8000.00:30:19:53:05:00 pathcost 0 age 0 max 20 hello 2 fdelay 15 If you're referring to the above samples as "appears from IPV6", those are Spanning Tree Protocol packets originating from the Cisco switch, and are unrelated to your ping test. You will see them on the wire frequently even in the absence of any normal IP traffic. You probably want the following Cisco configuration directive added to those switch ports that do not connect the 2900 to other switches: spanning-tree portfast The presence of the STP packets may or may not be related to your performance issues. They shouldn't be, but some buggy NICs/drivers do seem to get freaked out by STP. When STP is enabled on a switch port, it definitely will delay your initial link establishment by 30 seconds or so, when the attached computer is first powered up. That alone can confuse things when the NIC is trying to negotiate a link speed and the switch is still thinking about STP. It's even possible that you're getting a link speed/duplex mismatch out of it, and of course that will play holy hell with your response time. -- Greg Barniskis, Computer Systems Integrator South Central Library System (SCLS) Library Interchange Network (LINK) <gregb at scls.lib.wi.us>, (608) 266-6348
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?45D2198B.9020104>