[ale] more fun with ssh

[Wolf Halton]

On Sun, Aug 12, 2012 at 10:32 AM, Wolf Halton <wolf.halton at gmail.com> wrote:

>
>
> On Sun, Aug 12, 2012 at 10:19 AM, Jim Kinney <jim.kinney at gmail.com> wrote:
>
>> It still tries to resolve the ip to a host name. If you're not using dns
>> for that segment, put a name in etc/hosts.
>> On Aug 12, 2012 9:52 AM, "Wolf Halton" <wolf.halton at gmail.com> wrote:
>>
>>> Why would one of the hosts in my network take a very long time (over 10
>>> seconds) to negotiate a connection from another host on the same lan. Using
>>> IP address only, no DNS resolution involved.
>>>
>>> This would only be an interesting  oddity if it didn't time out nagios
>>> checks.
>>>
>>> Wolf
>>>
>>> http://evergreen-community-01.lyrasistechnology.org
>>> http://sourcefreedom.com
>>> Apache developer:
>>> wolfhalton at apache.org
>>>
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>>>
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>>
> debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu7
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug1: kex: server->client aes128-ctr hmac-md5 none
> debug1: kex: client->server aes128-ctr hmac-md5 none
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
> debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
> debug1: Host '192.168.10.56' is known and matches the RSA host key.
> debug1: Found key in /home/nagios/.ssh/known_hosts:32
> debug1: ssh_rsa_verify: signature correct
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug1: SSH2_MSG_NEWKEYS received
> debug1: SSH2_MSG_SERVICE_REQUEST sent
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> %% slowdown is right here %%
> debug1: Authentications that can continue: publickey,password
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/nagios/.ssh/identity
> debug1: Offering public key: /home/nagios/.ssh/id_rsa
> debug1: Server accepts key: pkalg ssh-rsa blen 277
> debug1: read PEM private key done: type RSA
> debug1: Authentication succeeded (publickey).
> debug1: channel 0: new [client-session]
> debug1: Requesting no-more-sessions at openssh.com
> debug1: Entering interactive session.
> debug1: Sending environment.
> debug1: Sending env LANG = en_US.UTF-8
>
> Why would only this host have that slow-down and none of the others?
> --
> This Apt Has Super Cow Powers - http://sourcefreedom.com
> Open-Source Software in Libraries - http://FOSS4Lib.org
> Advancing Libraries Together - http://LYRASIS.org
> Apache Open Office Developer wolfhalton at apache.org
>
>
How would I get it to NOT check reverse DNS?
http://ubuntuforums.org/showthread.php?t=1699197

"Just add the parameter "UseDNS no" on /etc/ssh/sshd_config" to the remote
host I am shelling into?

-- 
This Apt Has Super Cow Powers - http://sourcefreedom.com
Open-Source Software in Libraries - http://FOSS4Lib.org
Advancing Libraries Together - http://LYRASIS.org
Apache Open Office Developer wolfhalton at apache.org
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