Re: [PLUG] a to b slow, c to b fast

[Stephen Gran <steve@lobefin.net>]

This one time, at band camp, Benjamin W. Dugan said:
> 
> At our office we have about a half dozen linux PCs networked together. 
> Things are generally working well, and I try to keep making incremental
> improvements to the setup so it gets better and better.  I do love
> linux.  The system would undoubtedly be better if I wasn't the one
> maintaining it, but I am.
> 
> So my question is: why is it that (as one example) it takes 2 minutes to
> get the "login:" prompt when I telnet from one PC (call it "a") to
> another ("b"), compared to a fraction of a second if I telnet from a
> different one ("c") to "b"?  In shorthand: a to b is slow, but c to b is
> fast.
> 
> I see this same behavior with other network services-- ftp and networked
> printing at least, and there may be others.
> 
> Do I need to do something with resolv.conf on one of the computers?
> 
> If this question is in appropriate for this list, I'm sorry to have
> raised it.  And I'd be happy to look in the appropriate HOWTO or man
> page but I'm a bit at a loss as to which one to start with.
> 
> Thanks in advance.
> 
> Ben Dugan

It does sound like a reverse DNS issue - b probably doesn't have an
entry for a, and you have to wait for DNS to time out.  Try a diff of
the /etc/resolv.conf's of the affected machines - if they're all on a
LAN, there's no reason they should be different.

HTH,
Steve

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