How to setup static IP address on Debian

Let check few pre-requirements we need to obtain from the network admin:

1. Host name: deby01.dev.local
2. Ip address: 192.168.10.21
3. Network: 192.168.10/24
4. Gateway: 192.168.10.1
5. DNS Servers: 192.168.10.2 and 192.168.10.3
6. Local Domains: dev.local, corp.local

Here are few simple steps to give your Debian box static IP address:

1. Configure hostname:

   echo "deby01" > /etc/hostname
   

2. Ensure /etc/hosts file properly resolves localhost:

   127.0.0.1       localhost
   # In some circumstance it is not recommended to
   # resolve machine name to local ip address
   #127.0.1.1      deby01.dev.local  deby01
   

3. Here is content of /etc/network/interfaces

   # The primary network interface
   auto eth0
   iface eth0 inet static
        address 192.168.10.21
        netmask 255.255.255.0
        network 192.168.10.0
        broadcast 192.168.10.255
        gateway 192.168.10.1
   

4. Resolver configuration file /etc/resolv.conf:

   domain dev.local
   search dev.local dev.local. corp.local.
   nameserver 192.168.10.2
   nameserver 192.168.10.3
   

If you need setup a dynamic ip address with DHCP, take a look here.