D-Link DFL-800-AV-12 User Manual - Page 52
Services, 3.2.1. Overview, Example 3.6. Listing the Available Services
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3.2. Services Chapter 3. Fundamentals 3.2. Services 3.2.1. Overview A Service object is a reference to a specific IP protocol with associated parameters. A Service definition is usually based on one of the major transport protocols such as TCP or UDP, with the associated port number(s). The HTTP service, for instance, is defined as using the TCP protocol with associated port 80. However, service objects are in no way restricted to TCP or UDP. They can be used to define ICMP messages, as well as any user-definable IP protocol. Services are passive objects in that they cannot carry out any action in the system on their own. Instead, Service objects are used frequently in the various security policies defined by rule sets. For instance, a rule in the IP rule set can use a Service object as a filter to decide whether or not to allow certain traffic through the D-Link Firewall. For more information on how service objects are being used wit IP rules, see Section 3.5, "The IP Rule Set". A large number of Service objects come pre-defined with NetDefendOS. These include common services such as HTTP, FTP, Telnet and SSH. Pre-defined Services can be used and also modified just like user-defined Services. However, it is recommended NOT to make any changes to pre-defined services, but instead create new ones with the desired parameters. Example 3.6. Listing the Available Services To produce a listing of the available services in the system: CLI gw-world:/> show Service The output will look similar to the following listing: ServiceGroup Name -----------all_services all_tcpudp ipsec-suite l2tp-ipsec l2tp-raw pptp-suite Comments All ICMP, TCP and UDP services All TCP and UDP services The IPsec+IKE suite L2TP using IPsec for encryption and authentication L2TP control and transport, unencrypted PPTP control and transport ServiceICMP ... Web Interface 1. Go to Objects > Services Example 3.7. Viewing a Specific Service To view a specific service in the system: CLI gw-world:/> show Service ServiceTCPUDP echo The output will look similar to the following listing: Property Value 52