I was modifying a /etc/networking/interfaces file to alias one NIC to have both a static and a DHCP address. I received a strange message:
SIOCSIFFLAGS: Cannot assign requested address
Surfing didn't find the exact answer, but lead to finding it. One must
always have the DHCP address first and attached to the non-aliased interface. Ergo, this works:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
auto eth0:0
iface eth0:0 inet static
and this does not:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
auto eth0:0
iface eth0:0 inet dhcp
And because I didn't want the DHCP interface to the the default, I added the following to that interface:
up route del -net 0.0.0.0 dev eth0
