From owner-freebsd-questions Fri Aug 11 17: 9:21 2000 Delivered-To: freebsd-questions@freebsd.org Received: from mail3.aracnet.com (mail3.aracnet.com [216.99.193.38]) by hub.freebsd.org (Postfix) with ESMTP id 6EA9C37BD79 for ; Fri, 11 Aug 2000 17:09:17 -0700 (PDT) (envelope-from dmp@aracnet.com) Received: from shell1.aracnet.com (shell1.aracnet.com [216.99.193.21]) by mail3.aracnet.com (8.9.3/8.9.3) with ESMTP id RAA15145; Fri, 11 Aug 2000 17:09:20 -0700 Received: by shell1.aracnet.com (8.9.3) id RAA04711; Fri, 11 Aug 2000 17:09:17 -0700 Date: Fri, 11 Aug 2000 17:09:17 -0700 (PDT) From: Darren Pilgrim To: mouss Cc: freebsd-questions@freebsd.org Subject: Re: A very strange problem when changing IPs In-Reply-To: <4.3.0.20000811203808.025265d0@pop.free.fr> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, 11 Aug 2000, mouss wrote: > just an idea: > a possible cause woud be that there is another host using this IP address. > have you waited long enough after the reboot to see if problems do not > reappear? > indeed, ethernet packets are addressed using the MAC address, so if *.9 was > assigned to another host, packets will be sent to this host. > > To check that, use *.8, and try to ping *.9, or check the arp table of > another host > (arp -a). > > also, use tcpdump/tcpshow to see if packets are sent in both directions. > This actually will show > you the ethernet address used in the packets. A logical answer, and I had thought of this. When I first hit the problem, the first thing I did was switch the server and my workstation to their own hub, and put a sniffer on the segment, and restart the workstation. All the traffic I caught had the proper MAC and IP addresses, I also saw the proper TCP connection-establishment traffic when I tried telnetting to various open ports on the server. I was only able to regain the server's full responsiveness after rebooting it (having made the appropriate changes to /etc/rc.conf). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message