One IP for several Interfaces

Daniel Thielking Daniel.Thielking at
Fri Feb 20 13:45:18 UTC 2015


I'm really new to dhcpd and bind and I'm an apprentice. :-)

I have configured dhcpd so that all my clients are getting static 
IP-addresses I have used following declaration for my subnet:

    subnet netmask {
       option broadcast-address;
       option routers;
       deny unknown-clients;

and for my hosts:

    host laptop-2-lan {
       hardware ethernet 18:03:73:7a:61:dd;

    host laptop-2-wireless {
       hardware ethernet 38:59:F9:0F:1D:ED;

behind the DNS-Name ist one ip( 
configured in bind.

Now to the problem:

If I use laptop-2 in wireless mode everything works fine. If I want to 
use a cable both Interfaces are getting the same address. It manifests 
itself in a ip address conflict. How can I configure DHCPd to avoid 
this? But I do not want to use more than one address.

Hopefully you can help me. Thank you!


Auszubildender Fachinformatiker für Systemintegration
RWTH Aachen
Lehrstuhl für Integrierte Analogschaltungen
Raum 24C 313
Sommerfeldstr. 24
D-52074 Aachen

Email: Daniel.Thielking at
Phone: +49-(0)241-80-27771
   FAX: +49-(0)241-80-627771

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