IP change automatically!

[hamed23100]

Hi,

we have a server with 2 IP addresses, one shared and one dedicated, we hade no problem with server for long time, but suddenly last week we noticed that domain that was pn dedicated IP is not pinging! and after we checked IP was in plesk but not on Ehternet! we set it and site begins working again, but again today this happen again! it is mentionable that we have not do any changes on server and even we didnt SSH to server even!
what could cause this? did any one has this problem? our server support told that he saw this problem on another plesk server?!

 

[IgorG]

Any logs, related messages in logs, results of investigation and troubleshooting?

 

[hamed23100]

where should i search for logs? what is logs name and what is its path to search inside of it?

 

[IgorG]

after we checked IP was in plesk but not on Ehternet!

Investigation of IP address disappearance on OS level is usual Linux administrative task. I'm not sure that it is related to Plesk somehow.

 

[hamed23100]

Hi,

I found followings:

[root@ServerName log]# grep 'IP1' messages
Jan 20 07:58:03 ServerName avahi-daemon[1791]: Withdrawing address record for IP1 on eth1.
Jan 20 07:58:03 ServerName named[9061]: no longer listening on IP1#53
Jan 20 09:46:27 ServerName avahi-daemon[1791]: Registering new address record for IP1 on eth1.IPv4.
Jan 20 09:46:27 ServerName avahi-daemon[1791]: Withdrawing address record for IP1 on eth1.