Dynamic IP with IPTABLES

[RiezalR]

Anyone know of a way to automatically obtain dynamic ip address, to be placed in rc.firewall script?

 

[flugh]

I've used "pump" before. An example was:
pump -i eth0 -h isp.com

Pump comes in it's own package in Mandrake 9.0. It may be packaged with some dhcp tools in other distros. --
JR

 

[predamarcel]

hi,

ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | cut -d' ' -f1

will give you the IP associated with eth0 (dynamic or static)
so, you can use:
EXT_IP=`ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | cut -d' ' -f1`
__

http://marcell.hypermart.net/

___

 

[RiezalR]

Actually, my internet connection is dialled only after Linux has fully booted up and i have login as root. Therefore the dynamic IP is only available after the login. My firewall however, is launched during boot time. Is there any other way that I can do this? Or do I have to execute the firewall script everytime i change my IP?

 

[flugh]

On my Mandrake 9.0 box, there are some files in /etc/sysconfig/network-scripts. I'd look into 'ifup-ppp' if you are using dialup. Your distro may not have this exact file. Try doing a 'locate ifup', may get back some more relevant results. You just want to find any script that runs automagically after connection. In that script, have it call your rc.firewall.

I also found this link via Google:

http://www-jerry.oit.duke.edu/linux/HOWTO/ipchains_with_ppp_v62.html

Looks pretty useful. Sorry, I haven't done dialup in Linux for almost 3 1/2 years now. I'm a little rusty ;-) --
JR