Date: Thu, 11 May 2000 17:03:23 -0500 From: "TAZ Gravel, Emmanuel" <EGravel@taz.telusa.com> To: "'freebsd-net@freebsd.org'" <freebsd-net@freebsd.org> Subject: Weirdness in small network Message-ID: <6BFFC6F3FB6AD211A9D800A0C99B3E6F014A4123@TEAPHX0031>
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This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01BFBB94.B9A95720 Content-Type: text/plain I have a small network of about 20 machines, running many Unix-like OS'es of different age (some as old as over 10 years, discontinued). Something strange happened recently: two of the machines can't talk to each other, but can talk to the rest of the network. The network is primarily coax (10b2) but has a hub here and there, to add machines that have 10bT interfaces. All machines in the same network address space, and all have same netmask, so routing and other networking issues aren't a problem. Pinging doesn't work between each other (host unreachable) but can ping anywhere else in the network. Both machines are in the middle of the chain so hardware problems aren't an issue. The only truly odd thing I found was looking at the ARP cache. For one of the machines, it does have the proper MAC address associated with the IP address. This is a machine with the 10 year old OS. The other machine only shows (incomplete) instead of the proper info. I tried hardcoding the values in there but it didn't produce any results. I know no firewalling is in place. Right now I'm stuck and don't know where else to look. Anyone have any idea what this could be? Please also forward directly to me since I can't subscribe to mailing lists here. Thanks, Emmanuel Gravel ------_=_NextPart_001_01BFBB94.B9A95720 Content-Type: text/html <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2650.12"> <TITLE>Weirdness in small network</TITLE> </HEAD> <BODY> <P><FONT SIZE=2 FACE="Arial">I have a small network of about 20 machines, running many Unix-like</FONT> <BR><FONT SIZE=2 FACE="Arial">OS'es of different age (some as old as over 10 years, discontinued).</FONT> <BR><FONT SIZE=2 FACE="Arial">Something strange happened recently: two of the machines can't</FONT> <BR><FONT SIZE=2 FACE="Arial">talk to each other, but can talk to the rest of the network. The network</FONT> <BR><FONT SIZE=2 FACE="Arial">is primarily coax (10b2) but has a hub here and there, to add machines</FONT> <BR><FONT SIZE=2 FACE="Arial">that have 10bT interfaces. All machines in the same network address</FONT> <BR><FONT SIZE=2 FACE="Arial">space, and all have same netmask, so routing and other networking</FONT> <BR><FONT SIZE=2 FACE="Arial">issues aren't a problem. Pinging doesn't work between each other</FONT> <BR><FONT SIZE=2 FACE="Arial">(host unreachable) but can ping anywhere else in the network. Both</FONT> <BR><FONT SIZE=2 FACE="Arial">machines are in the middle of the chain so hardware problems aren't</FONT> <BR><FONT SIZE=2 FACE="Arial">an issue.</FONT> </P> <P><FONT SIZE=2 FACE="Arial">The only truly odd thing I found was looking at the ARP cache. For</FONT> <BR><FONT SIZE=2 FACE="Arial">one of the machines, it does have the proper MAC address associated</FONT> <BR><FONT SIZE=2 FACE="Arial">with the IP address. This is a machine with the 10 year old OS. The</FONT> <BR><FONT SIZE=2 FACE="Arial">other machine only shows (incomplete) instead of the proper info. I</FONT> <BR><FONT SIZE=2 FACE="Arial">tried hardcoding the values in there but it didn't produce any results.</FONT> <BR><FONT SIZE=2 FACE="Arial">I know no firewalling is in place. Right now I'm stuck and don't know</FONT> <BR><FONT SIZE=2 FACE="Arial">where else to look.</FONT> </P> <P><FONT SIZE=2 FACE="Arial">Anyone have any idea what this could be?</FONT> </P> <P><FONT SIZE=2 FACE="Arial">Please also forward directly to me since I can't subscribe to mailing</FONT> <BR><FONT SIZE=2 FACE="Arial">lists here.</FONT> </P> <P><FONT SIZE=2 FACE="Arial">Thanks,</FONT> </P> <P><FONT SIZE=2 FACE="Arial">Emmanuel Gravel</FONT> </P> </BODY> </HTML> ------_=_NextPart_001_01BFBB94.B9A95720-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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