Date: Wed, 9 Apr 1997 12:06:25 +0800 (WST) From: Adrian Chadd <adrian@obiwan.aceonline.com.au> To: Adrian Carter <adrian@apic.net> Cc: questions@freeBSD.org Subject: Re: Weird Network Behaviour Message-ID: <Pine.BSF.3.95q.970409120606.2430A-100000@obiwan.aceonline.com.au> In-Reply-To: <3.0.1.32.19970409142658.00792100@mail.apic.net>
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Had a similar problem a while back.. Remote clients are running PPP? Whats their MTU/MRU? Cya -- Adrian Chadd | UNIX, MS-DOS and Windows ... <adrian@psinet.net.au> | (also known as the Good, the bad and the | ugly..) On Wed, 9 Apr 1997, Adrian Carter wrote: > G'Day all. > > Got a bit of a weird one here. We are an ISP running pretty much as a > FreeBSD house, with them being a mixture of 2.1.5's (only one machine, due > to the fact it is offsite and I havent had the time to go onsite and > upgrade) and 2.1.7's. > > In the last 4 days the machine running 2.1.5 has been sporadically > 'dropping data'. In that I mean, as an example, If youy try and send a > message via that machines SMTP port, communication works fine for the HELO, > MAIL FROM, and RCPT TO. The client then sends the DATA command, and > according to sendmail logs, the machine reports a 354 message and awaits > the data. However, the end-user program never see's the 354 message, and > eventually times out. If you use the same machine, with the same e-mail > message, and use a different SMTP host, it works fine. > > So, its a sendmail problem me thinks... so I recompile, reconfigure, > cajoule, coax, abuse sendmail for 2 days, all to no avail. During the > course of all this, its discovered that rcp'ing to the machine any large > file also timesout. However, in 90% of cases, small files and small e-mails > go through fine, but I dont see how this relates, because, the CLIENT is > not seeing the servers 354, which occurs BEFORE it sends the data to the > server, so at the stage that it is 'breaking' the server is unaware of the > size of the message. > > So its not sendmail me says. So on I go with a kernel recompile. No change. > Shut down every service on teh machine except qpop and sendmail 8.8.5. No > change. Now the weirdest bit of all is, reboot the machine, it works ok for > a while, then 10 - 15 hours after rebooting, it starts doing it all again. > > To through anotehr spanner into the works, it appears like another machine, > running 2.1.7-RELEASE, is doing a similar thing. Users are occasionally > reporting they FTP in as a real user, they get authenticated, but then they > get a timeout when ls'ing. Similar situations are happening with the web > services running on this machine. Access them direct on the LAN, not a > problem, however, remote users report that a lot of the time they get > broken pipe or timeout messages. > > Wether the two problems are related I am not sure. They seem similar, but > the problem here is just to diverse. Im no un*x newbie, but its got me > buggered as to what the problem is. Even the network card's have been > replaced, the drop cable replaced and even increased RAM, and there is only > about a .1% collision rate on the ethernet segment. Its jsut so *WEIRD* > that it is so intermittent and is only related to certain services it > appears (qpop on the 2.1.5 machine with the sendmail problem works without > problems, even weeks after a reboot). > > Any suggestions or ideas, however trivial, would be appreciated, as I have > pretty much exhausted all tests I can think off, and the problem still > exsists. > > Thanks all > > Adrian Carter > Sys Admin > The Asia Pacific Internet Company > -- > ************************************************************************* > *Adrian Carter Email: adrian@apic.net * > *Systems Administrator URL: http://www.apic.net/ * > *The Asia Pacific Internet Company Pty Ltd Autoresp: info@apic.net * > * Internet Access, Web Housing, Mailing List Management * > * Phone: (+612) 9419-5133 Fax: (+612) 9419-5155 * > ************************************************************************* >
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