Changeing ip and i wanna keep track of it.

Hargibi · 06-28-2006, 10:31 PM

Ok so i got this linux server running slackware 10.2.
So sometimes after i reboot it, it changes IP adress and i have to go there and check what IP adress it has changed to so i can update my dns server and stuffs..
But is there a way to check that IP adress without going there? Like some program on my server that sends some ping or so to my machine so i can check what the ip has changed to?

Thanks

gilead · 06-28-2006, 10:56 PM

If your network interface is eth0, the following returns the IP address. You can run it as a cron job and do something based on whether the output changes. I've used the full path to each executable because on my system cron runs with a different environment:

Code:

/sbin/ifconfig eth0 | /bin/grep 'inet addr' | /bin/awk  -F: {'print $2'} | /bin/cut -d' '  -f1

If you're using a dynamic DNS provider like dyndns.com, I'd recommend looking at one of the tools already out there to do this sort of thing. There are a couple at http://www.dyndns.com/support/clients/unix.html - I use ddclient and haven't had any problems with it.

Hargibi · 06-28-2006, 11:03 PM

Im using http://www.mydomain.com/
And to tell the truth im not very good with linux machines..
So that code u typed there dident actually say me much.
So if u could be a bit more specific what it does id be very happy

Thanks.

gilead · 06-28-2006, 11:39 PM

In that case, you only need to read my very first sentence. That code returns your IP address

Just to make sure we're talking about the same thing. The DNS you're talking about updating - is it a DNS server that you run, or is it the mydomain.com DNS server?

Hargibi · 06-29-2006, 12:17 AM

mydomain is running my dns

*Edit*
If id copy that line of urs..
What do i do with it?
And where can i later check for the new IP adress?

Notwerk · 06-29-2006, 02:38 AM

If mydomain.com is running the DNS you wish to update, I'd suggest looking for available client scripts that handle this issue and running it periodically (check out "cron").

The line Gilead provided retrieves the information about eth0 and *processes* it to remvoe everything except the device's current IP address.

A quick read of any introduction to linux shell commands should familiarize you with how to run commands in the shell, write scripts and all sorts of cool things you can do.

http://www.freeos.com/guides/lsst/

Google is your friend