Obtaining static IP while in DHCP

thehadar · 09-05-2011, 06:17 AM

Hi guys,
My interface is set to DHCP -

# cat /etc/network/interfaces
# Configure Loopback
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
up route add -net 224.0.0.0 netmask 240.0.0.0 eth0

Is there a way to configure Linux to use a static IP incase no dhcp server is found? (and continue searching for a dhcp server every timeout inorder to get back to "dhcp mode" when a suited server is found)

I beleive that this is what Windows does.

Thanks!
Hadar

jefro · 09-05-2011, 03:29 PM

Assign a secondary ip or use a zero config, in some cases a hosts file or other file to use depending on the service needed.

http://www.practicallynetworked.com/..._and_linux.htm

The problem is still the dhcp is out. That should be fixed.

eSelix · 09-05-2011, 03:56 PM

If you are using dhclient you can also write a script in "/etc/dhcp/dhclient-exit-hooks.d" and check for operation FAIL or TIMEOUT, then configure static IP. Read "man dhclient-script" for more info.