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PENTAGRAM Cerberus P 6341
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Well-known and Registered Ports
Port
Number
Protocol Description
20 TCP FTP Data
21 TCP FTP Control
22 TCP & UDP SSH Remote Login Protocol
23 TCP Telnet
25 TCP SMTP (Simple Mail Transfer Protocol)
53 TCP & UDP DNS (Domain Name Server)
69 UDP TFTP (Trivial File Transfer Protocol)
80 TCP World Wide Web HTTP
110 TCP POP3 (Post Office Protocol Version 3)
119 TCP NEWS (Network News Transfer Protocol)
123 UDP NTP (Network Time Protocol)
161 TCP SNMP
443 TCP & UDP HTTPS
1503 TCP T.120
1720 TCP H.323
4000 TCP ICQ
7070 UDP RealAudio
Virtual Server / Port Mapping
Application – Select the service you wish to configure
Protocol – Automatic when you choose Application from listbox or select a protocol type
which you want.
External Port / Internal Port – Enter the public port number & range you wish to configure.
Internal IP Address – Enter the IP address of a specific internal server to which requests
from the specified port is forwarded.
Add – Click this button to add new item to the list.
Edit / Delete – Click this button to save new values to list item with selected Edit field or to
delete list items with selected Delete field.
Since NAT acts as a “natural” Internet firewall, your router protects your network from access
by outside users, as all incoming connection attempts point to your router unless you
specifically create Virtual Server entries to forward those ports to a PC on your network. When
your router needs to allow outside users to access internal servers, e.g. a web server, FTP
server, Email server or game server, the router can act as a “virtual server”. You can set up a
local server with a specific port number for the service to use, e.g. web/HTTP (port 80), FTP
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