automating a script with dhcp address changes

automating a script with dhcp address changes

[Karthik Vishwanath]

Hello,

I wanted to run a few tasks each time the IP address on my PC changed. The
PC connects to the network using DHCP and runs ubuntu (LTS, 2.6.15-26). 

I noticed that there was a directory called /etc/network/if-up.d that had
a couple of scripts in them. I was wondering if I could just leave my
script in that directory and expect it to get executed everytime DHCP
changes the machines IP?


Thanks,

-K


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Re: automating a script with dhcp address changes

[Ray Olszewski]

Karthik Vishwanath wrote:
> Hello,
> 
> I wanted to run a few tasks each time the IP address on my PC changed. The
> PC connects to the network using DHCP and runs ubuntu (LTS, 2.6.15-26). 
> 
> I noticed that there was a directory called /etc/network/if-up.d that had
> a couple of scripts in them. I was wondering if I could just leave my
> script in that directory and expect it to get executed everytime DHCP
> changes the machines IP?

I believe the answer is no. There is a way to handle it (a script that 
the daemon will run), but the details are specific to the DHCP client 
you are using. The most common ones are pump, dhcpcd, and dhclient, and 
I don't know which of them Ubuntu uses (Debian-Sid offers all 3, plus a 
few others, and even there, I don't know which is most commonly used). 
See which daemon your system runs and check its man page for the 
specifics of its config rules.

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