Date: Wed, 14 Jul 1999 14:49:40 -0600 From: Damien Tougas <dtougas@converging.net> To: <freebsd-questions@freebsd.org> Subject: Getting frustrated with bizarre networking problem... Message-ID: <D1378A34D8E2D211831900105A99D3FE06D1C7@BDC>
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Hello, I made a posting about a week or so ago about a network problem that we are currently experiencing with our web/mail server. I have included a copy of this original message below just as a reference. It was suggested to me to try logging packets using ipfw or tcpdump, so I decided to use tcpdump. The bizarre thing is that as soon as I started using tcpdump, my problem virtually vanished (it still occurred, but much less frequently). I have since discovered that whenever I notice that the server appears to be down to the outside world, all I have to do is start tcpdump and it comes back instantaneously. Truly a bizarre problem. I have just upgraded (yesterday) to the latest version of 3.2-stable, and have been in dialog with our ISP as well, bu so far nothing has been uncovered. We are using a 3C905B-TX NIC, are there any issues with this card? I am going to try to replace the NIC to see if there might be a hardware problem, but I am starting to run out of ideas. Any suggestions would be greatly appreciated. Damien Tougas Converging Technology Solutions, Inc. 10148 - 73 Street Edmonton, Alberta T6A 2W9 Phone: (780) 469-1679 Fax: (780) 461-5127 mailto:dtougas@converging.net http://www.converging.net Original Posting (Subject was: Network problems...): We have been experiencing an ineteresting network problem, I'm not exactly sure what it is rooted in, but I thought I would ask around just in case it is related to somthing in FreeBSD. We have two servers directly connected to the internet through an ADSL connection, one is running FreeBSD 3.1, the other is running NT Server 4.0. The FreeBSD server is our internet http and mail server, the NT server is acting as a gateway to our internal network running Microsoft Proxy. Frequently (at least once a day) the FreeBSD server will lose contact with the outside world. What I mean by this is that nobody ouside of our subnet can access it, not even ping works. While this occurs, we can still ping the NT server from the outside (verifying that the ADSL still works), and we can still access the FreeBSD server from within the subnet without any problems. After an hour or so, the problem clears itself up and the FreeBSD server goes live again. I have noticed this happen on several occasions while using ssh to access the FreeBSD server from home. I would be working, lose my connection and no longer have any contact with the server for about an hour, then it would mysteriously reappear. We have also observed that when we lose outside contact with the server, if we reboot it, it comes back immediately, indicating that the problem is likely related to some server configuration issue. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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