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Re: Delay when SSH'ing into some systems in my LAN

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On Tue, 21 Jul 2020 16:28:57 +0000, William Unruh wrote:

> On 2020-07-21, S.K.R. de Jong <SKRdJ@nowhere.net> wrote:
>> 	This started happening recently, with no apparent reason.
>>
>> 	I have systems A, B, C, D in my LAN. When I SSH from A into B the
>> connection gets established immediately. However when I do it from A to
>> C I get the following SSH traces in A:
>>
>> 	OpenSSH_7.4p1, OpenSSL 1.0.2u  20 Dec 2019 debug1: Reading
>> 	configuration data /home/xyz/.ssh/config debug1: Reading 
configuration
>> 	data /etc/ssh/ssh_config debug2: resolving "C" port 22
> 
> Try to ssh into C using C's IP address rather than name.
> If that goes immediately Try putting C's name into A's /etc/hosts Since
> it seems to be A that is complaining, try putting C's name and address
> into /etc/hosts on A.
> It seem's that it is the reverse dns that is problematic.
> Note that in the above A,B,C,D could be names or they could be IP
> addresses. It might help to actually give us the exact log lines, rather
> than the edited ones.

	Well, I found the solution, but I am not entirely sure why it was 
broken in the first place.

	In A, the contents of my /etc/resolv.conf have the following line 
at the top:

	search <my-domain> <work-domain>

where <mydomain> is a domain assigned to my LAN, and <work-domain> is the 
domain of my employers, whose systems I access over a VPN.

	When I do

	ssh B

the connection is immediately sent to system B in my LAN, and everything 
is fine - no delay at all. But when trying the same with C, the DNS 
server first seems to try to resolve C.<work-domain> - which is the 
origin of the delay. I don't know why it does so for C (and D) but not 
for B, but the fact is that removing <work-domain> from the search line 
in A's /etc/resolv.conf file solves the problem.

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Thread

Delay when SSH'ing into some systems in my LAN "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2020-07-21 15:27 +0000
  Re: Delay when SSH'ing into some systems in my LAN William Unruh <unruh@invalid.ca> - 2020-07-21 16:28 +0000
    Re: Delay when SSH'ing into some systems in my LAN "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2020-07-21 18:29 +0000
      Re: Delay when SSH'ing into some systems in my LAN William Unruh <unruh@invalid.ca> - 2020-07-21 19:52 +0000
    Re: Delay when SSH'ing into some systems in my LAN "S.K.R. de Jong" <SKRdJ@nowhere.net> - 2020-07-21 19:33 +0000

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