Irc; Intel-Video-Phone; Kerberos-V4 And Kerberos-V5; L2Tp - Watchguard Firebox X5500E Reference Manual

Packet Filter Policies

IRC

Internet Relay Chat (IRC) is a system for Internet chatting. To use IRC you must have an IRC client and
Internet access. The IRC client is a software application on your computer that sends and receives
messages to and from an IRC server. The IRC server makes sure that all messages are sent to all users in
the chat session.
Characteristics
• Internet Protocol(s): TCP
• Port Number(s): 6667

Intel-Video-Phone

Intel Video Phone is a real-time multimedia application based on H.323. H.323 is an international
standard for conferencing over TCP/IP networks. This policy does not filter for dangerous content. It
does not support QpS or RSVP protocol, and it does not support NAT.
Characteristics
• Internet Protocol(s): TCP
• Port Number(s): 522, 1720

Kerberos-v4 and Kerberos-v5

The Kerberos network authentication protocol is an authentication system developed by the
Massachusetts Institute of Technology (MIT). Kerberos enables two computers to exchange private
information across an open network using authentication for security.
Characteristics
• Internet Protocol(s): TCP, UDP
• Kerberos v 4 Port Numbers(s): UDP 750
• Kerberos v 5 Port Number(s): TCP 88, UDP 88

L2TP

Layer 2 Tunneling Protocol (L2TP) is an extension to the PPP protocol that enables ISPs to operate
virtual private networks.
Characteristics
• Internet Protocol(s): UDP
• Port Number(s): 1701
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