ZyXEL Communications ZyXEL ZyWALL P1, User Manual

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ZyWALL P1 User’s Guide
116 Chapter 7 Firewall Screens
Figure 45 Firewall Example: My Service Example Rule Summary
Rule 1: Allows a My Service connection from the WAN to IP addresses 10.0.0.10 through
10.0.0.15 on the LAN.
7.8 Predefined Services
The Available Services list box in the Edit Rule screen (see Figure 39 on page 110 ) 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 ).
(UDP/TCP:53)
means UDP port 53 and TCP port 53. Custom services may also be
configured using the Custom Services function discussed previously.
Table 34 Predefined Services
SERVICE DESCRIPTION
AIM/New-ICQ(TCP:5190) AOL’s Internet Messenger service, used as a listening port by ICQ.
AUTH(TCP:113) Authentication protocol used by some 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(UDP/TCP:53) Domain Name Server, a service that matches web names (e.g.
www.zyxel.com) to IP numbers.