Vulcan Cyber

Network equipment may terminate TCP connections after a period of inactivity. Vulcan's gateway uses autossh, which by default sends a keepalive signal every 10 minutes. If the network equipment is configured to timeout before this duration, it can lead to network disconnections.

Steps to Change the Default SSH Keepalive Time:

- Access the gateway machine where you need to change the keepalive settings.

- Open the <code>/etc/rc.local</code> file for editing. This file contains startup commands that are executed when the machine boots.

- Add the following line to the file before any command that starts with <code>autossh</code>:
 export AUTOSSH_POLL=180
- Replace <code>180</code> with the desired number of seconds for the keepalive interval. This value should be less than the timeout period set on your network equipment.

- After saving the changes, reboot the machine to apply the new configuration. This ensures that the updated keepalive setting takes effect.

1. Log In to the Gateway Machine:
 - Access the gateway machine where you need to change the keepalive settings.
2. Edit the Configuration File:
 - Open the <code>/etc/rc.local</code> file for editing. This file contains startup commands that are executed when the machine boots.
3. Modify the Keepalive Setting:
 - Add the following line to the file before any command that starts with <code>autossh</code>:
 export AUTOSSH_POLL=180
 - Replace <code>180</code> with the desired number of seconds for the keepalive interval. This value should be less than the timeout period set on your network equipment.
4. Reboot the Machine:
 - After saving the changes, reboot the machine to apply the new configuration. This ensures that the updated keepalive setting takes effect.

Note: It's important to choose a keepalive interval that is appropriate for your network environment. Setting it too low might result in unnecessary network traffic, while setting it too high might not prevent disconnections effectively.