Prestige 662H/HW Series User’s Guide
Table 56 | Content Access Control: General: Services (continued) | |
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LABEL |
| DESCRIPTION |
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Add |
| Click Add to add a service to be blocked to the Blocked Services box. |
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Clear All |
| Click Clear All to empty the Blocked Services box. |
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Back |
| Click Back to return to the previous screen. |
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Apply |
| Click Apply to save your changes back to the Prestige. |
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Cancel |
| Click Cancel to return to the previously saved settings. |
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16.2.2.1 Available Services
The Available Services list box in the Services screen displays some predefined services that the Prestige supports. The following table shows a list of services that can be configured. 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.
Table 57 Available Services
SERVICE | DESCRIPTION |
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AOL’s Internet Messenger service, used as a listening port by ICQ. | |
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AUTH(TCP:113) | Authentication protocol used by some servers. |
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BGP(TCP:179) | Border Gateway Protocol. |
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BOOTP_CLIENT(UDP:68) | DHCP Client. |
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BOOTP_SERVER(UDP:67) | DHCP Server. |
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A popular videoconferencing solution from White Pines Software. | |
UDP:7648, 24032) |
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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 |
H.323(TCP:1720) | NetMeeting uses this protocol. |
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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 |
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ICQ(UDP:4000) | This is a popular Internet chat program. |
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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. |
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189 | Chapter 16 Content Access Control |