Dualog Network Control - Firewall Services


In Dualog terminology, a firewall service is a technical term for the combination of an Internet Protocol (most commonly TCP and UDP) and port number(s)/range.

Creating a firewall service allows you to restrict and control traffic access onboard a vessel using a firewall rule.



  1. Login to Dualog Portal with an account with the appropriate access type
  2. Within the menu located in the top left corner > Connection Suite > Network Control
  3. Click on "Configure Network Control" > Firewall Rules under Organisation config > under Firewall Services
  4. Click on "Create Firewall Service" 
  5. Specify the name, protocol, and port(s) > Create Service



Note: A Service can be defined by one or more port numbers. Those port numbers can be given as a combination of individual and comma-separated port numbers and port ranges. (Example: 80,443)

A port range is specified by two numbers separated by a hyphen (-). Ranges are inclusive on both ends.

(Example: 2100-6400)


Each IP packet belongs to one protocol (TCP, UDP, ICMP …). TCP and UDP packets will also use a single port number; the other protocols are implicitly associated with port number 0.

An IP packet is said to match service if the protocol is equal and if the port number of the packet is included in the list of individual port numbers and ranges specified in the Services settings.

Please note that if different Service definitions overlap, the matching behavior is undefined.



Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request



Please sign in to leave a comment.