ZyXEL Communications Internet Security Gateway ZyWALL 100 - Manual (Page 178)

ZyWALL 100 Internet Security Gateway
16-8 Creating Custom Rules
SERVICE DESCRIPTION
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(UDP/TCP:53) Domain Name Server, a service that matches web names (e.g.
www.zyxel.com) to IP numbers.
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: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.
IKE(UDP:500) The Internet Key Exchange algorithm is used for key distribution and
management.
IPSEC_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.
NEW-ICQ(TCP:5190) An Internet chat program.
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.