> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Paul Heinlein
> Sent: Friday, May 23, 2008 2:35 PM
> To: CentOS mailing list
> Subject: RE: how to debug ssh slow connection issues.
>
> On Fri, 23 May 2008, Jason Pyeron wrote:
>
> >>> debug3: Normalising mapped IPv4 in IPv6 address
> >>> debug3: Trying to reverse map address 192.168.1.80.
> >>>
> >>> paused 7 seconds
> >>
> >> Here, obviously, is part of the problem. Your name service isn't
> >> answering reverse lookups for your LAN addresses -- or it least it
> >> isn't answering them in a timely manner. Fixing that, either
> >> through DNS or /etc/hosts, will help a bunch.
> >
> > [root@xxxxxxxxxxxx ~]# date && host 192.168.1.80 && date && host
> > host80.1.internal.pdinc.us && date Fri May 23 13:55:52 EDT 2008
> > 80.1.168.192.in-addr.arpa domain name pointer
host80.1.internal.pdinc.us.
> > Fri May 23 13:55:52 EDT 2008
> > host80.1.internal.pdinc.us has address 192.168.1.80 Fri May 23 13:55:52
> EDT
> > 2008
> > [root@xxxxxxxxxxxx ~]#
> >
> > Hmmm, does not take 7 seconds.
>
> User-space utilities like /usr/bin/host don't always provide an
> accurate reflection of the name services inherited by init- or
> kernel-launched processes -- especially if the network wasn't (for
> reasons unknown) fully functional at boot time.
Reboot?
>
> Do you remember if there were any network timeouts when you booted the
> machine in question?
Oddly, yes there was.
>
> Are you running nscd?
>
[root@devserver21 ~]# chkconfig --list | grep nscd
nscd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
> I'm still inclined to believe that hostname-lookup issues are involved
> here; an strace with timestamps might provide a better glimpse of the
> exact system calls that are timing out.
Like wise, but with local DNS and local IPs humming perfectly?
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