Ssh logon delay Post: 302802531

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Operating Systems Linux Red Hat Ssh logon delay Post 302802531 by edstevens on Friday 3rd of May 2013 04:32:44 PM

05-03-2013

Registered User

Quote:

Originally Posted by hiten.r.chauhan

Make two modification:-
(1) comment everything in /etc/resolve.conf

Interesting. That change alone fixed it. So I tried copying resolv.conf from one of my OL 5.6 machines, but that did *NOT* fix it. And of course, that alone is not a viable solution because resolve.conf gets regenerated at every boot up.

Quote:

Originally Posted by hiten.r.chauhan

(2) Make UseDNS=no in /etc/sshd/sshd_config

I take it there is a typo there, as there is no file by that exact name:

HTML Code:

[root@vblnxsrv02 ~]# cd /etc
[root@vblnxsrv02 etc]# find . -name "ssh*config"
./ssh/ssh_config
./ssh/sshd_config
[root@vblnxsrv02 etc]# grep UseDNS ./ssh/ssh_config
[root@vblnxsrv02 etc]# grep UseDNS ./ssh/sshd_config
#UseDNS yes

So I went with the second, and made made this change:

HTML Code:

[root@vblnxsrv02 etc]# grep UseDNS ./ssh/sshd_config
UseDNS no

That worked *after* a reboot - which of course reset the resolv.conf. So either of the two is sufficient independent of the other, and of course the second (sshd_config) is the only one that is persistent.

Which then led me back to compare with my OL 5.6 installation. It had the same setting as we started with on the 6.3 :

Code:

[root@vblnxsrv03 etc]# grep DNS ./ssh/sshd_config
#UseDNS yes

So at this point I have a workable solution, but no explanation of why it is *different* on the 6.3 machine - why it *needs* to be different. I suspect the answer is in the output of the 'route -n' commands I posted earlier but I'm not enough of a net admin to understand what we're looking at there.

Quote:

Originally Posted by hiten.r.chauhan

If any of the ethernet adapter are configured to use DHCP, DNS, /etc/resolve.conf will be generated by Network Manager when you reboot the VM. In that case you need to comment everything in /etc/resolve.conf every time.

edstevens

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