Network strangeness
Aaron Konstam
akonstam at sbcglobal.net
Wed Apr 30 21:09:31 UTC 2008
On Wed, 2008-04-30 at 15:01 +0100, Chris G wrote:
> On Wed, Apr 30, 2008 at 08:55:32AM -0500, Aaron Konstam wrote:
> > I have two machines on a home network:
> > cyrus - wireless
> > saturn - wired
> >
> > On cyrus : ping saturn and host saturn both fail saying saturn can't be
> > found. However, ssh saturn works.
> >
> > On saturn: ping cyrus works but host cyrus fails.
> > ssh cyrus, works
> >
> > I don't use iptables. Any explanations for this behavior?
> >
> > Errors are like:
> > ** server can't find saturn: NXDOMAIN
> >
> > I suspect that some things use the local /etc/host bu others do not.
>
> Certainly the 'host' command doesn't use /etc/hosts so that suggests:-
>
> cyrus can't find saturn using DNS but saturn is in its /etc/hosts
> file so ssh works.
>
> saturn can find cyrus using DNS, it may well be able to find it
> using /etc/hosts as well.
>
> I wonder if you have things set up so ping (ICMP packets?) are refused
> somewhere in the system so that ping will never work regardless of
> DNS, routing, etc.
I agree with your analysis but I don't understand the asymmetry of the
behavior. I am unaware that I ban ping but that may be a DNS thing.
--
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Whenever I feel like exercise, I lie down until the feeling passes.
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net
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