Difference between revisions of "How to change server IP address from DHCP to static?"
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Static IP addresses are assigned for network interfaces. You can find out all your network interfaces names using this command: | Static IP addresses are assigned for network interfaces. You can find out all your network interfaces names using this command: | ||
ifconfig | |||
You have to pick the one that has the address you already know. For example we have a server with such interfaces: | You have to pick the one that has the address you already know. For example we have a server with such interfaces: | ||
Revision as of 06:53, 23 September 2011
1. Gather the required information
Static IP addresses are assigned for network interfaces. You can find out all your network interfaces names using this command:
ifconfig
You have to pick the one that has the address you already know. For example we have a server with such interfaces:
eth0 Link encap:Ethernet HWaddr 00:22:15:98:30:27
inet addr:192.168.0.108 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::222:15ff:fe98:3022/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:491112 errors:0 dropped:0 overruns:0 frame:0
TX packets:452621 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:553199357 (527.5 MiB) TX bytes:48077932 (45.8 MiB)
Interrupt:24 Base address:0x6000
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:16436 Metric:1
RX packets:7039 errors:0 dropped:0 overruns:0 frame:0
TX packets:7039 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1892466 (1.8 MiB) TX bytes:1892466 (1.8 MiB)
We see that current IP address is 192.168.0.108, network mask: 255.255.255.0
DNS settings are located in a configuration file /etc/resolv.conf:
bash-4.1$ cat /etc/resolv.conf # Generated by NetworkManager nameserver 213.197.128.71 nameserver 213.197.150.130
2. Change IP address to static
Open a configuration file with a desired Linux editor (for example nano, mcedit, vi) which matches your network interface name, in this example we will use eth0:
mcedit /etc/sysconfig/network-scripts/ifcfg-eth0
You will see a configuration file like this:
DEVICE="eth0" BOOTPROTO="dhcp" HWADDR="00:22:15:98:30:27" NM_CONTROLLED="yes" ONBOOT="yes"
You have to change it to look like this:
Warning!!! You must be sure that the settings below are correct or you will shoot yourself to the leg - you will be disconnected and will not be able to connect again when configuring remotely
DEVICE=eth0 BOOTPROTO=none ONBOOT=yes HWADDR=00:22:15:98:30:27 # <-- !!!!leave this setting as is in your current configuration, it will be different than provided here!!! NETMASK=255.255.255.0 # set here your netmask IPADDR=192.168.0.22 # set here your desired STATIC IP ADDRESS GATEWAY=192.168.0.1 # set here your desired Gateway address TYPE=Ethernet USERCTL=no IPV6INIT=no PEERDNS=yes
Warning!!! You must be sure that the settings above are correct or you will shoot yourself to the leg - you will be disconnected and will not be able to connect again when configuring remotely
3.Restarting the network
When you are sure that you set up the network correctly - save the changes to an opened file and restart your server networking using this command:
/etc/init.d/network restart
Other settings that have to be changed
When changing the server address you also must make additional changes documented here
