Predefined Services; Table 10-2 Predefined Services - ZyXEL Communications ZyXEL ZyWALL 50 User Manual

10.5 Predefined Services

The Available Services list box in the Rule Config(uration) screen (see Figure 10-4) displays all predefined
services that the ZyWALL already supports. Next to the name of the service, two fields appear in brackets.
The first field indicates the IP protocol type (TCP, UDP, or ICMP). The second field indicates the IP port
number that defines the service. (Note that there may be more than one IP protocol type. For example, look at
the default configuration labeled "(DNS)".
entries are supported. Custom services may also be configured using the Custom Ports function discussed
later.
SERVICE
AIM(TCP:5190)
BGP(TCP:179)
BOOTP_CLIENT(UDP:68)
BOOTP_SERVER(UDP:67)
CU-SEEME(TCP/UDP:7648,
24032)
DNS(UDP/TCP:53)
FINGER(TCP:79)
FTP(TCP:20.21)
H.323(TCP:1720)
HTTP(TCP:80)
HTTPS
ICMP
ICQ(UDP:4000)
IKE(UDP:500)
IPSEC_TUNNEL(ESP:0)
IRC(TCP/UDP:6667)
Creating Custom Rules
means UDP port 53 and TCP port 53. Up to 128
(UDP/TCP:53)

Table 10-2 Predefined Services

AOL's Internet Messenger service, used as a listening port by ICQ.
Border Gateway Protocol.
DHCP Client.
DHCP Server.
A popular videoconferencing solution from White Pines Software.
Domain Name Server, a service that matches web names (e.g.
) to IP numbers.
www.zyxel.com
Finger is a UNIX or Internet related command that can be used to find
out if a user is logged on.
File Transfer Program, a program to enable fast transfer of files,
including large files that may not be possible by e-mail.
Net Meeting uses this protocol.
Hyper Text Transfer Protocol - a client/server protocol for the world wide
web.
HTTPS is a secured http session often used in e-commerce.
ICMP service allows normal ICMP packets to go through.
This is a popular Internet chat program.
The Internet Key Exchange algorithm is used for key distribution and
management.
This service is used by the IPSec ESP (Encapsulation Security Protocol)
tunneling protocol.
This is another popular Internet chat program.
ZyWALL 50 Internet Security Gateway
DESCRIPTION
10-7