G-Technology G-RACK 12, User Manual

Page: 172 / 296

Use Cases/Tutorials
p. 172
How to protect your G-RACK 12 from (unwanted) network traffic.
Use the Firewall configuration to screen unwanted traffic. The G-RACK 12 has a built-in network
firewall in the OS that filters traffic between the server and incoming network traffic.
1. Press the Network option.
2. You will be presented with 4 tabs. (General, Interfaces, Service Discovery, and Firewall)
3. Select select the Firewall tab.
4. Chose if you are creating an IPv4 or IPv6 rule.
5. Press the Plus (+) to open the rules dialog.
6. Select direction of the rule:
• INPUT for inbound connections
• OUTPUT for outbound connections
7. Choose action for a packet which matches the rule:
• ACCEPT -- allow the packet to pass over
• REJECT -- drop the packet and send ICMP reject message back to the sender which prevents
hanging of the connection
• DROP -- drop the packet
• LOG -- just log the packet in the journal
• Nothing -- do nothing (useful for debugging)
8. Specify source and destination port and address. Destination address can be either a network
IP address (with /mask), a IP range or a plain IP address. A ‚!’ argument before the address
specification inverts the sense of the address. Ports can be specified either by number (e.g. 80 for