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JCCyC
Asked: 2009-09-11 11:05:33 +0800 CST

Distribution-independent way of testing if an interface's current IP was obtained via DHCP?

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Firstly, parsing configuration files isn't really correct. And not nearly distro-independent either.

My first idea was to search for running dhclient processes, but each distribution uses a different esoteric command line. Even the binary name itself varies. In Fedora, it's dhclient. In Ubuntu, it's dhclient3.

Is there something in /proc or /sys that indicates that an IP is dynamic?

linux

2 Answers

  1. Best Answer

    Have you grepped around in /var/lib/dhcp*/dh*lease* ?

    On my Ubuntu system, as an example, /var/lib/dhcp3/dhclient-eth0.lease contains information about the current and recent leases.

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  2. Check the DHCP server for a lease that matches the MAC address of the network card

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