[strongSwan] dhcp plugin: mac address unpredictable?

Harald Dunkel harald.dunkel at aixigo.de
Wed Mar 19 13:53:50 CET 2014

Hi folks,

I have to restrict the IP address pool of my DHCP server to
known MAC addresses only. In this context I have 2 questions
about the dhcp plugin (using identity_lease = yes):

Wiki says, the mac address is derived from the "IKEv2 identity".
Does this mean the mac address changes, if I renew the client's

It is pretty difficult to find the right MAC address in the log
file of the DHCP server, and charon doesn't tell, either. (Maybe
I am too blind to see?) Would it be possible to hardwire the mac
address in the certificate?

Every helpful response is highly appreciated
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