Date: Tue, 5 Mar 2002 22:12:30 -0700 From: "Tim Pushor" <timp@crossthread.com> To: <questions@freebsd.org> Subject: Weird IP problem (arp?) Message-ID: <00cf01c1c4cd$845d6ea0$0201a8c0@dedalus>
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[-- Attachment #1 --] Hi, I am having a strange problem and hoping someone has seen this one before. I have an Internet connected network with several FreeBSD servers sitting on a class 'C' subnet behind a Cisco 1005 series router connected to ISP - simple setup. The symptoms are: The server seemed fine upon initial build. It could talk everywhere - locally, and to the Internet via the 1005 (its default route). I get home and try to get there over the Internet, no go - no response. I go to another machine in the local network and ping or otherwise try to get to the machine in question. Sometimes its immediate, sometimes it takes a short while, but it always comes back. After this I can communicate from my house over the Internet to the server for a while (not sure exactly how long, but I would guess for at least an hour and never more than 4) before it becomes inaccessible again. It would also seem that getting on the box locally and establishing network connections anywhere also cures the problem for a short while. I initially started with a 3COM 3C905C card, and have switched it out with a D-Link to rule out the network card. There was no change. There is nothing at all in the system log (or system logs of neighboring machines). I am running the stock Generic kernel (for now). I do not have access to the router. I am no expert in troubleshooting TCP/IP, but this seems like an arp problem. Has anyone seen this before? Failing this I will probably run tcpdump on one of the other servers, but I guess I am not exactly sure what I am looking for. Thanks for any and all advice/help, Tim [-- Attachment #2 --] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>Hi,</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I am having a strange problem and hoping someone has seen this one before.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I have an Internet connected network with several FreeBSD servers sitting on a class 'C' subnet behind a Cisco 1005 series router connected to ISP - simple setup. The symptoms are:</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>The server seemed fine upon initial build. It could talk everywhere - locally, and to the Internet via the 1005 (its default route).</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I get home and try to get there over the Internet, no go - no response.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I go to another machine in the local network and ping or otherwise try to get to the machine in question. Sometimes its immediate, sometimes it takes a short while, but it always comes back. After this I can communicate from my house over the Internet to the server for a while (not sure exactly how long, but I would guess for at least an hour and never more than 4) before it becomes inaccessible again.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>It would also seem that getting on the box locally and establishing network connections anywhere also cures the problem for a short while.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I initially started with a 3COM 3C905C card, and have switched it out with a D-Link to rule out the network card. There was no change. There is nothing at all in the system log (or system logs of neighboring machines). I am running the stock Generic kernel (for now). I do not have access to the router.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>I am no expert in troubleshooting TCP/IP, but this seems like an arp problem. Has anyone seen this before? </FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>Failing this I will probably run tcpdump on one of the other servers, but I guess I am not exactly sure what I am looking for.</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>Thanks for any and all advice/help,</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2>Tim</FONT></SPAN></DIV> <DIV><SPAN class=539025704-06032002><FONT face=Arial size=2></FONT></SPAN> </DIV></BODY></HTML>
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