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[ISG/NS/SSG] Configuring a Custom Service

  [KB4220] Show Article Properties


This article shows how to configure a Custom Service.




On occasion, a custom service needs to be created to allow certain ports and protocols to pass through the Juniper firewall.

When defining a custom TCP service, the source port in most cases is a random port, between 1024 and 65535. The destination port is specified to match the server's listening port.

A Custom Service requires a source port range, a destination port range, and a transport protocol ( TCP, UDP, etc.) to be specified.

 Note: For this article, a custom service for AppleTalk File Services is configured. To create a custom service for AppleTalk File Services, which listens on TCP port 548, define this service with the following ports:

  • Source Port Low: 1024
  • Source Port High: 65535
  • Destination Port Low: 548
  • Destination Port High: 548

Configure a custom service via Web UI:

Step one: Open the Web UI. For more information on accessing the Web UI, see KB4060 - Accessing Your NetScreen, SSG, or ISG Firewall Using the WebUI .

Step two: From the ScreenOS options menu, click Objects, select Services, and then click Custom.

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Note: In ScreenOS 6.0.0 and above, the Custom services are defined differently in the Web UI: Click Policy, then Policy Elements, then Services, and then click Custom.

Step three: From the Custom page, click New.

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Step four: In the Service Name text box, enter a Service Name.

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Step five: Under Transport protocol, click to select tcp.

Step six: Under Source Port Low, enter 1024, and then under Source Port High, enter 65535. Under Destination Port Low, enter 548, and then under Destination Port High, enter548.

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Step seven: Click OK.

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Configure a custom service via CLI:

  1. Log into the CLI.

  2. Enter the command set service <name> protocol <protocol> src-port <port range> dst-port <port range>.

Example: set service "AppleTalk File Services" protocol tcp src-port 1024-65535 dst-port 548-548

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