Date: Thu, 7 Dec 2000 12:05:56 -0500 (EST) From: Adam Kujawski <adamkuj@gatordog.com> To: bv@wjv.com Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Strange fetchmail/freebsd/verio problem Message-ID: <Pine.LNX.4.21.0012071158060.12141-100000@blackbox.gatordog.com> In-Reply-To: <200012071518.KAA58009@mail.wanlogistics.net>
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I wonder if it might be an MTU problem of some sort. I've seen a similar problem before that was caused by bad firmware on a switch. The switch was dropping packets over 1428 bytes or something like that (I remember it was just under the normal size for an ethernet frame..). You could login, because the username/password prompt use relativly small packets. However, as soon as you logged and did anything that sent a larger amound of data (i.e. ls, top, netstat..) the connection would freeze. Similarly, you could load very small web pages, but anything over a kb or so wouldn't load. Try pinging/tracerouting to your servers with larger and larger packet lengths. Good luck, Adam On Thu, 7 Dec 2000 bv@wjv.com wrote: > Date: Thu, 7 Dec 2000 10:17:59 -0500 (EST) > From: bv@wjv.com > To: freebsd-isp@FreeBSD.ORG > Subject: Strange fetchmail/freebsd/verio problem > > Reply to: bv@wjv.com > X-Mailer: ELM [version 2.4ME+ PL61 (25)] > MIME-Version: 1.0 > Content-Type: text/plain; charset=US-ASCII > Content-Transfer-Encoding: 7bit > > I maintain some servers on a Level3 backbone. While waiting > for our DS3 and the ATM to come up so I can get ADSL service > from 'myself', I've been using my old dialup account on Verio. > > Everthing was fine until last night. Then the fetchmail stopped > working. > > I found that no matter what I did, telnet, ftp, fetchmail, to > any of the machines there I would get a login prompt. I would > then get a slow entry for the login named, equally slow for > password, and then things such as an 'ls' would either > never complete or take 2 to 5 minutes. > > I went to the facilty - and everything looked normal there. I had > fast access to everywhere in the world [100Mbit uplink into > ther OC48/OC192 network]. This was about 1AM. Nothing wrong > so I came back. > > THis AM the same thing. I called my partner and he could access > all the web sties we host with no problem, login in remotely, etc. > I still could not. > > I do some maintenance on a machine across the state. I performed > an ssh loign there, and then was able to access the machines > as I normally would. It's just this account coming in from Verio > just wont access web sites, ftp, etc. NOTHING has been changed, > it just stopped. The last changes to this system were about 6 > weeks ago. > > I'm totally confused at this moment. My dialup is performing PPP > and NAT and it works flawlessly. I can go to any other sites > in the world and have no problem - as the ssh above shows. > > So what do I look for, what debuggers do I run, etc. > > The web machines are FreeBSD 4.0, and the mail if FreeBSD 3.4. > THe only thing I see in the logs there on the failed mail > transers are POP timeouts. If it were only mail I could see > perhaps a password has changed. BUt I can access that machine > with my password if I got in via another route - which is a C&W > system. > > Anybody have any clues. > > Until I get this fixed, and/or change providers [I'd just as soon > not go through that as we hope to have our own ADSL up in a month], > I'm ftp'ing the my mailbox on the mail server to the system > across the state, and then transfering back. > > It's as if one I get into the machine it doesn't like the IP's > or that Verio is cutting me to 10cps or something. Customer > service at Verio [at least in the past] has been 1+ hour on hold so > I'd just as not go that route if I can. > > Anybody have any idea, or what I can turn on to trace this problem. > > Bill Vermillion > -- > bv @ wjv.com > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message > ________________________________________________________________ Adam Kujawski | Home: (419) 352-1289 adamkuj@gatordog.com | Cell: (419) 261-3268 ________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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