A common task is to set up mail forwarding on your web or mail server so that you can have email addresses like me@mydomain.com ; however, managing email on your server sucks, especially if you get into the horrors of courier imap or hula, and then you have to worry about backing up your email, spam filtering and lots of lovely tasks.

sudo dpkg -i filename.deb

Defining physical interfaces such as eth0

Lines beginning with the word “auto” are used to identify the physical interfaces to be brought up when ifup is run with the -a option. (This option is used by the system boot scripts.) Physical interface names should follow the word “auto” on the same line. There can be multiple “auto” stanzas. ifup brings the named inter faces up in the order listed. For example following example setup eth0 (first network interface card) with 192.168.1.5 IP address and gateway (router) to 192.168.1.254:
iface eth0 inet static
address 192.168.1.5
netmask 255.255.255.0
gateway 192.168.1.254