D-Link DFL-2500 User Guide - Page 64
User-defined IP protocol service, Objects, Services, IP Protocol Service, General, IP Protocol
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8.2. Services 45 User-defined IP protocol service Services that run over IP and perform application/transport layer functions can be defined by IP protocol numbers. IP can carry data for a number of different protocols. These protocols are each identified by a unique IP protocol number specified in a field of the IP header, for example, ICMP, IGMP, and EGP have protocol numbers 1, 2, and 8 respectively. The currently assigned IP protocol numbers and references are published on the web site of Internet Assigned Numbers Authority (IANA): http://www.iana.org/assignments/protocol-numbers Similar to TCP/UDP port range described previously, a range of IP protocol numbers can be used to specify multiple applications for one service. Example: Adding a service that matches the GRE protocol ( For more information about GRE, please refer to 22.2 PPTP/L2TP ) WebUI : Objects → Services → Add → IP Protocol Service General Enter the following and then click OK: Name: GRE IP Protocol: 47 D-Link Firewalls User's Guide
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