Date: Sun, 22 Oct 2006 11:58:12 +0200 From: "Simon L. Nielsen" <simon@FreeBSD.org> To: freebsd-current@freebsd.org Cc: Hajimu UMEMOTO <ume@FreeBSD.org> Subject: Resolver not always resolving hostnames Message-ID: <20061022095811.GA10743@zaphod.nitro.dk>
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Hey, I think something odd is going on in the resolver. It seems like it doesn't resolve hostnames some of the time. It's not really easily reproducible, but I have seen it happen several times with cvsup where it can't resolve the cvsup server. If I re-run cvsup it works fine. I see it on recent -CURRNET's (server running cvsup below is October 12, system running host(1) is October 15). The cvsup log: CVSup update begins at 2006-10-18 17:29:00 Updating from cvsup3.dk.freebsd.org Name lookup failure for "cvsup3.dk.freebsd.org": Host name lookup failed Updating local ncvs CVSup update ends at 2006-10-18 17:29:01 I also seen odd things happen with host(1). These two commands were run right after each other. I don't know if it's related, but I suspect it is. $ host cvsup3.dk.freebsd.org cvsup3.dk.freebsd.org is an alias for mirror03.inet.tele.dk. cvsup3.dk.freebsd.org is an alias for mirror03.inet.tele.dk. $ host cvsup3.dk.freebsd.org cvsup3.dk.freebsd.org is an alias for mirror03.inet.tele.dk. mirror03.inet.tele.dk has address 195.41.53.219 cvsup3.dk.freebsd.org is an alias for mirror03.inet.tele.dk. cvsup3.dk.freebsd.org is an alias for mirror03.inet.tele.dk. I only have one name-server in resolv.conf, so the problem isn't due to hitting different caching name-servers. Initially I thought it was a local problem for me, but joel@ has seen the same on RELENG_6 (from July 8), and xride@ has seen the same/similar with csup where his workaround was to ping the cvsup server before running csup. So, has anyone seen anything similar? Since I can't reproduce the issue at will I don't really know where to look for what's going on, and of course it could be DNS issue... -- Simon L. Nielsen
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