In this example we will show how to configure the firewall in a Vigor2820 router to block outgoing SMTP mail from all computers but allow mail to be sent from one computer (mail server) with a static IP address of 192.168.1.10
Step 1 – Filter Setup
Go to Firewall >> Filter Setup configuration menu.
Select “Default Data Filter” and then select then next filter rule to edit as shown in the diagram below:
Step 2 – Edit Filter Setup
- Enable Filter rule
- Select direction LAN to WAN
- Enter IP address of computer to be allowed to send SMTP mail then invert selection as shown in the diagram
- Set destination IP to “ANY”
- Set Service type to use:
- Protocol TCP
- Source port ANY (1 – 65535)
- Destination Port 25
- In “Application” set Action to Block immediately