Sometimes we have to configure IP fixed in server and even on workstations.
In this article I will show to configure the IP on Debian and Ubuntu distributions.
Is good idea make backup this configuration before modify.
Use this command
#cp /etc/network/interface /etc/network/interface.bkp
If you want to restore settings
#cp /etc/network/interface.bkp /etc/network/interface
Now you have interface backup.
First check which interface is connected to your network
#ifconfig
eth0 Link encap:Ethernet HWaddr 94:de:80:f3:ca:94
inet addr:192.168.200.2 Bcast:192.168.200.255 Mask:255.255.255.0
inet6 addr: fe80::96de:80ff:fef3:ca94/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:71628 errors:0 dropped:0 overruns:0 frame:0
TX packets:55307 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:47699321 (47.6 MB) TX bytes:7476368 (7.4 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:10114 errors:0 dropped:0 overruns:0 frame:0
TX packets:10114 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:826870 (826.8 KB) TX bytes:826870 (826.8 KB)
As in the example eth0 interface is connected with the IP 192.168.200.2
We most configure this archive /etc/network/interface
Use your favorite text editor, i like to use vi.
#vi /etc/network/interface
now let's edit the last line
auto eth0
iface eth0 inet static
address 192.168.200.100
netmask 255.255.255.0
gateway 192.168.200.1
Save configuration and after run the command
#/etc/init.d/networking restart
Another way to configure the IP is used ifconfig command , but every time the system is booted, IP configuration will not be saved.
#ifconfig eth0 192.168.200.100 netmask 255.255.255.0
After configure your gateway which command:
#route add default gw 192.168.200.1 eth0
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