[CentOS] Slow login to system without internet connection

Ljubomir Ljubojevic office at plnet.rs
Tue Nov 20 18:22:40 UTC 2012


Hi.

For a long time I am puzzled why, when internet connection is gone 
(beyond first router, outside of subnet) SSH (and telnet?) connection is 
drastically slowed.

Same behavior, but less impacted is observed when system boots without 
working internet connection, and I am not sure, but I think even access 
to SAMBA fileshares can be/is affected. Affected systems are mostly 
production servers, and too spaced apart in time to be able to point a 
finger in something I am doing wrong.

I have not had time to gather more facts, I always forget/don;t have 
time, so I will only focus on definite SSH issue on CentOS 6.3, although 
I have seen same with 5.x.

1 server in question is set in following maner:
[root at chiron ~]# cat /etc/networks
default 0.0.0.0
loopback 127.0.0.0
link-local 169.254.0.0

[root at chiron ~]# cat /etc/sysconfig/network
NETWORKING=yes
NTPSERVERARGS=iburst
HOSTNAME=chiron.example.com

[root at chiron ~]# cat /etc/hosts
127.0.0.1	localhost localhost.localdomain localhost4 
localhost4.localdomain4 chiron.example.com chiron
::1	localhost localhost.localdomain localhost6 localhost6.localdomain6 
chiron.example.com chiron

Does it have anything to do with /etc/hosts file not having row with 
used IP address, or is problem somewhere else?

Searching the net gives too much irrelevant links, and all I need it to 
be pointed in the right direction.


-- 

Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

Google is the Mother, Google is the Father, and traceroute is your
trusty Spiderman...
StarOS, Mikrotik and CentOS/RHEL/Linux consultant


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