Date: Fri, 03 Nov 95 10:59:03 -0800 From: Bakul Shah <bakul@netcom.com> To: hackers@freebsd.org Subject: Network oddity between two FreeBSD machines. Message-ID: <199511031859.KAA29234@netcom22.netcom.com>
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I am running into a strange network problem. Perhaps someone else here has seen the same problem and solved it? Here is the net setup: ....----+--------------+----.... ethernet-A | | | | one two | | | | ....----+--------------+----.... ethernet-B One and two are FreeBSD machines, both running routed -q. One has link address of one-A on net-A and one-B on net-B. Two has link address of two-A on net-A and two-B on net-B. Net-A has been around for a while and a number of other machines are on it, including the nameserver. One and two have their primary net interface to net-A. Pinging two-A from one works fine (and takes about 0.7 ms). Pinging one-A from two also works (and takes about 0.7 ms). Pinging two-B from one or pinging one-B from one is the weird case: the ping time starts out high (anywhere from 10 ms to 1+ second) and with every ping the response time goes down by 10 ms until it reaches 10 ms at which ping response time bumps up to 1000 ms and the pattern repeats: 1000, 990, 980, ... 20, 10, 1000, 990 ... This symptom does not change even when I remove all other machines from net-B. Ditto with using dotted inet address instead of names and pinging to only directly connected nets (ping -n -r). I spent some time tracking this but gave up as more pressing things had to be done but I am curious as to why this happens. That 10ms reduction on successive pings sounds like some internal timer going off. Just in case it matters, both machines are P100 Gateway PCI machines, and are using 3COM 509 cards for both interfaces, and running recent SNAPs but not the latest one. Net-A has Linux/BSDi/Solaris/IRIX etc. as well as win-NT and win-95 machines. Anyone seen anything like this? Yeah, I know I can ask on comp.protocols.tcp-ip but thought I'd ask here first. Thanks for any insight! --bakul
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