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Accepted
kiran_g
Asked: 2015-09-01 05:30:12 +0800 CST

How to make static IP address dynamic in /etc/network/interfaces

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I need to set the IP address of a ubuntu device() to be read from an EEPROM. The user has he option to change the IP address as well.

I know the commands to read and write to the EEPROM. But how do I edit the /etc/network/interfaces file so that it automatically fetches the IP address from the EEPROM on network start/restart?

Btw..I am aware of the methods to configure static IP address the normal way. But in that method, I could only hardcode the IP address in the interfaces file. Is there any way I can make this a variable, which I can populate from EEPROM and use in the interfaces file?

Also, I know that I can do the whole thing using a shell script by calling the EEPROM command and ifconfig. But I would like to do this using the standard init scripts. Also I need DHCP configuration to happen in the standard way.

networking

1 Answers

  1. Best Answer

    I got the answer from superuser site. The debian manual says that it is possible to configure an interface without an IP address like this:

       iface eth0 inet manual
      pre-up /path/to/script/which_changes_your_ip.sh
      post-down /path/to/script/which_removes_your_ip.sh

    I am not sure how I can give credit to the person who gave me the solution. So I will just accept my answer itself.

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