Disabling IP Forwarding on the Standby ECS

Scenarios

If a virtual IP address is used in an active/standby scenario, disable IP forwarding on the standby ECS.

Linux

1. Log in to the ECS.
2. Run the following command to switch to user root:

   su root

3. Check whether IP forwarding is enabled:

   cat /proc/sys/net/ipv4/ip_forward

   In the command output, 1 indicates it is enabled, and 0 indicates it is disabled. The default value is 0.

   • If 1 is displayed, go to 4.
   • If 0 is displayed, no further action is required.
4. Use either of the following methods to modify the configuration file:
   • Method 1: Use the vi editor to open the /etc/sysctl.conf file, change the value of net.ipv4.ip_forward to 0, and enter :wq to save the change and exit.
   • Method 2: Use the sed command. An example command is as follows:

     sed -i '/net.ipv4.ip_forward/s/1/0/g' /etc/sysctl.conf

5. Make the modification take effect:

   sysctl -p /etc/sysctl.conf

Windows

1. Log in to the ECS.
2. Open Command Prompt and run the following command:

   ipconfig/all

   In the command output, if the value of IP Routing Enabled is No, the IP forwarding function is disabled.

3. Press Windows and R keys together to open the Run box, and enter regedit to open the Registry Editor.
4. Set the value of IPEnableRouter under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters to 0.
   • If the value is set to 0, IP forwarding will be disabled.
   • If the value is set to 1, IP forwarding will be enabled.