Date: Tue, 25 Mar 1997 22:25:47 -0800 From: "Jin Guojun[ITG]" <jin@george.lbl.gov> To: ponds!freebsd.org!bugs@ucbvax.Berkeley.EDU, ponds!rivers@dg-rtp.dg.com Cc: bugs@freebsd.org Subject: Re: /etc/hosts no longer used for rexec() ? Message-ID: <199703260625.WAA15646@george.lbl.gov>
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}
} > % more /etc/host.conf
} > # $Id: host.conf,v 1.2 1993/11/07 01:02:57 wollman Exp $
} > # If that doesn't work, then try the /etc/hosts file
} > hosts
} > # Default is to use the nameserver first
} > bind
} > # If you have YP/NIS configured, uncomment the next line
} > # nis
} >
} > I guess it is a bug in somewhere I do not know. ping and telnet work well
} > under such circumstance.
} > However, rsh, rcp, rlogin etc. do NOT work if DNS is not reachable. It may be
} > the rexec() 's problem. I am sure they tried to talk to DNS even though my
} > /etc/host.conf is correct. The tcpdump shows that these program try to talk
} > to DNS regardless the /etc/hosts and /etc/host.conf. So, I changed the Subject.
}
} I reported a similar observation (rlogin seemed to wait for a DNS
} server to time out even when /etc/host.conf was configured to look
} at 'hosts' first.)
}
} I think this has something to do with the reverse look-up (which
} the r-cmds do).. that is , here's an IP address; what's the name.
} That was my best guess at the time. [See the mail archives for
} my previous ramblings about 2.1.5 and DNS and rlogin...]
}
} I did discover that in 2.1.6.1 this problem seems to be improved.
}
} Also, I had:
} domain my.domain
} nameserver xxx.xx.xx.x
} nameserver xxx.xx.xx.x
} nameserver 127.0.0.1
}
} as I was thinking of running a local caching name server to get
} around the problem... but I never got it set up. I found that removing
} the last line helps greatly with the problem (I suppose if the
} network is unreachable, you don't have to wait for a timeout.)
}
} Do you have something like that?
I have tried the local caching name server (last line) sometimes ago,
but it does not help. We, do have some machines set up like this:
domain my.domain
nameserver 127.0.0.1
with a modified named(8) under solaris system. This is similar to use no
DNS at all because the local caching name server sometimes is not updated
properly somehow. BUt I did not make it work under FreeBSD.
-Jin
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