ZyXEL Communications G-2000 Plus V2, User Manual

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ZyXEL G-2000 Plus v2 User’s Guide
160 Chapter 11 Firewall Screens
FTP(TCP:20.21) File Transfer Program, a program to enable fast transfer of files,
including large files that may not be possible by e-mail.
H.323(TCP:1720) NetMeeting uses this protocol.
HTTP(TCP:80) Hyper Text Transfer Protocol – a client/server protocol for the world
wide web.
HTTPS(TCP:443) HTTPS is a secured http session often used in e-commerce.
ICQ(UDP:4000) This is a popular Internet chat program.
IPSEC_ TRANSPORT /
TUNNEL(AH:0)
The IPSEC AH (Authentication Header) tunneling protocol uses this
service.
IPSEC_TUNNEL(ESP:0) The IPSEC ESP (Encapsulation Security Protocol) tunneling protocol
uses this service.
IRC(TCP/UDP:6667) This is another popular Internet chat program.
MSN Messenger (TCP:1863) Microsoft Networks’ messenger service uses this protocol.
MULTICAST(IGMP:0) Internet Group Multicast Protocol is used when sending packets to a
specific group of hosts.
NetBIOS(TCP/UDP:137~139,
45)
NetBIOS (Network Basic Input/Output System) are TCP or UDP
broadcast packets that enable a computer to connect to and
communicate with a LAN.
NEWS(TCP:144) A protocol for news groups.
NFS(UDP:2049) Network File System – NFS is a client/server distributed file service
that provides transparent file sharing for network environments.
NNTP(TCP:119) Network News Transport Protocol is the delivery mechanism for the
USENET newsgroup service.
PING(ICMP:0) Packet Internet Groper is a protocol that sends out ICMP echo
requests to test whether or not a remote host is reachable.
POP3(TCP:110) Post Office Protocol version 3 lets a client computer get e-mail from a
POP3 server through a temporary connection (TCP/IP or other).
PPTP(TCP:1723) Point-to-Point Tunneling Protocol enables secure transfer of data
over public networks. This is the control channel.
PPTP_TUNNEL(GRE:0) Point-to-Point Tunneling Protocol enables secure transfer of data
over public networks. This is the data channel.
RCMD(TCP:512) Remote Command Service.
REAL_AUDIO(TCP:7070) A streaming audio service that enables real time sound over the web.
REXEC(TCP:514) Remote Execution Daemon.
RLOGIN(TCP:513) Remote Login.
ROADRUNNER(TCP/
UDP:1026)
This is Time Warner’s cable modem session management protocol. It
handles authentication and dynamic addressing.
RTELNET(TCP:107) Remote Telnet.
RTSP(TCP/UDP:554) The Real Time Streaming (media control) Protocol (RTSP) is a
remote control for multimedia on the Internet.
SFTP(TCP:115) Simple File Transfer Protocol.
SMTP(TCP:25) Simple Mail Transfer Protocol is the message-exchange standard for
the Internet. SMTP enables you to move messages from one e-mail
server to another.
Table 53 Predefined Services (continued)
SERVICE DESCRIPTION