> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Jay Leafey
> Sent: Sunday, May 25, 2008 2:17 PM
>
> Jason Pyeron wrote:
> >
> >> -----Original Message-----
> >> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> >> Behalf Of Filipe Brandenburger
> >> Sent: Friday, May 23, 2008 8:55 PM
> >>
> >> Try to change this in your /etc/ssh/sshd_config:
> >>
> >>
> >> Change:
> >>
> >> UseDNS yes
> >> to:
> >> UseDNS no
> >>
> >
> > Okay that fixed it, but why? I used nslookup and set my server to the
> same
> > as /etc/resolv.conf. There were no delays, at all all of our class C
> > resolves both ways (and matching) same as out private net.
> >
> > Where to go next on "properly" fixing this sshd/dns issue?
> >
> >
>
> From the earlier posts, it appears that your DNS server is not properly
> resolving the REVERSE addresses, i.e. IP address-to-hostname. SSH does
> a reverse lookup, trying to resolve the IP address to a hostname, unless
> you set the "UseDNS" option to "no".
Agreed, but all of my tests indicate DNS is fine
>
> Until you fix your DNS server to properly resolve the reverse addresses
> for your network you will continue to have this issue. Having gone down
> this road myself, it's not as hard as it sounds. Just having a
> nameserver resolve your local FORWARD zone won't cut it, you have to
> have the REVERSE zone set up too.
It does the reverse, indicated many posts ago, but has been since snipped
out.
>
> In my example, I have a local network named "local" (how original!) and
> use the 192.168.1.0/24 address range. The nameserver I use (Bind 9 on a
> CentOS box) is configured mostly as a caching nameserver but resolves
> two local domains, "local" and "1.168.192.in-addr.arpa". All of the
> name-to-ip entries ("A" records) and aliases ("CNAME" records) are in
> the "local" zone, all of the ip-to-name entries ("PTR" records) are in
> the "1.168.192.in-addr.arpa" zone.
>
Ditto.
DNS test for 192.168.1.0/24 and known not to exist 192.168.99.99
[root@devserver21 ~]# for i in `seq 0 255`; do host 192.168.1.$i | grep
NXDOMAIN; done; host 192.168.99.99 | grep NXDOMAIN
Host 99.99.168.192.in-addr.arpa not found: 3(NXDOMAIN)
[root@devserver21 ~]# for i in `seq 0 255`; do host 192.168.1.$i; done; host
192.168.99.99
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