How do I Configure Static IP Address Internet Protocol (IPv4)
To configure static IP Address, you need to update or edit network configuration file to assign an Static IP Address to a system. You must be superuser with su (switch user) command from terminal or command prompt.
For RHEL/CentOS
Open and edit network configuration file for (eth0 or eth1) using your favorite editor. For example, to assigning IP Address to eth0 interface as follows.
1. How to Assign a IP Address to Specific Interface
The following command used to assign IP Address to a specific interface (eth1) on the fly.
2. How to Check an IP Address
To get the depth information of your network interfaces like IP Address, MAC Address information, use the following command as shown below.
3. How to Remove an IP Address
The following command will remove an assigned IP address from the given interface (eth1).
4. How to Enable Network Interface
The “up” flag with interface name (eth1) enables a network interface. For example, the following command will activates the eth1 network interface.
5. How to Disable Network Interface
The “down” flag with interface name (eth1) disables a network interface. For example, the following command will De-activates the eth1 network interface.
6. How do I Check Route Table?
Type the following command to check the routing table information of system.
7. How do I Add Static Route
Why you need to add Static routes or Manual routes, because that the traffic must not pass through the default gateway. We need to add Static routes to pass traffic from best way to reach the destination.
8. How to Remove Static Route
To remove assigned static route, simply type the following command.
9. How do I Add Persistence Static Routes
All the above route will be lost after a system restart. To add permanent Static route, edit file /etc/sysconfig/network-scripts/route-eth0 (We are storing static route for (eth0) and add the following lines and save and exist. By default route-eth0 file will not be there, need to be created.
10. How do I Add Default Gateway
Default gateway can be specified globally or for in interface-specific config file. Advantage of default gateway is If we have more than one NIC is present in the system. You can add default gateway on the fly as shown below command.
Please refer manual page doing man ip from terminal/command prompt to know more about IP Command.
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