LinuxQuestions.org - Assignment of IP-Address

here is the /etc/network/interfaces file on my laptop.

Code:

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).



# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

#auto eth0

#iface eth0 inet dhcp

#iface eth0 inet static

#        address 192.168.2.50

#        netmask 255.255.255.0

#        network 192.168.2.0

#        broadcast 192.168.2.255

#        gateway 192.168.2.1

#        address 192.168.1.55

#        netmask 255.255.255.0

#        network 192.168.1.0

#        broadcast 192.168.1.255

#        gateway 192.168.1.1



auto wlan0

#iface wlan0 inet dhcp

 iface wlan0 inet static

        address 192.168.2.55

        netmask 255.255.255.0

        network 192.168.2.1

        broadcast 192.168.2.255

        gateway 192.168.2.1

the reason i have the eth0 # out is that i do not want to use that connection when i am at the house. it is enough of a pain in the arse to get the ndiswrappers to work properly after a reboot (takes about 5-20 attempts to get it stable and working). I also set a static IP for the wlan0 so i always know exactly what LAN IP my laptop has for when i am going to ssh into that box.

In the eth0 you notice it has 2 differnt sets of IPs. one is for the house when i do use the eth0 (only when i get really tired of ndiswrappers locking up my laptop) and the other is when i am at the office. this allows me to go in and just remove the # for the proper IP range, if i want to go static, then type the following command:

Code:

ifconfig restart

and poof away i run on the eth0. you do have to # out the wlan0 portion to prevent it from giving you fits while running on the eth0.

notice that i also have the dhcp setting line for both eth0 and wlan0 device. If i choose or need to use the local DHCP server, then i comment everything else out, and uncomment the line with the iface device inet dhcp and away i go after running the above command to restart my network.

FYI if the above line does not work you should also be able to type the following:

Code:

/etc/init.d/networking restart

that should also do the trick. you can always replace restart with stop/start and do the command 2 times. ifconfig maybe up/down not restart/stop/start but either way it will get the job done for you.

best of luck.