142
servers.
BGP TCP 179 Border Gateway Protocol.
BOOTP_CLIENT UDP 68 DHCP Client.
BOOTP_SERVER UDP 67 DHCP Server.
CU-SEEME TCP
UDP
7648
24032
A popular videoconferencing solution from
White Pines Software.
DNS TCP/UDP 53 Domain Name Server, a service that
matches web names (for example
http://us.zyxel.com) to IP numbers.
ESP
(IPSEC_TUNNEL)
User-Defined 50 The IPSEC ESP (Encapsulation Security
Protocol) tunneling protocol uses this
service.
FINGER TCP 79 Finger is a UNIX or Internet related
command that can be used to find out if a
user is logged on.
FTP TCP
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.
ICMP User-Defined 1 Internet Control Message Protocol is often
used for diagnostic or routing purposes.
ICQ UDP 4000 This is a popular Internet chat program.
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