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Table 2 Commonly Used Well-Known Ports (TCP)
Number
Description
18
Message Send Protocol (MSP)
20
FTP – Data
21
FTP – Control
22
SSH Remote Login Protocol
23
Telnet
25
Simple Mail Transfer Protocol (SMTP)
49
Login Host Protocol (Login)
53
Domain Name System (DNS)
69
Trivial File Transfer Protocol (TFTP)
70
Gopher Services
80
HTTP
109
POP2
110
POP3
119
Newsgroup (NNTP)
194
Internet Relay Chat (IRC)
458
Apple QuickTime
1080
Socks
Once you have determined which PCs need to support which
services, follow the steps below to configure the router to map
the required ports to the host PC:
1. Assign a fixed IP address to the PC you want to set up as a
service host (see
Configuring a Fixed IP Address for a PC
on
page 45). Record this IP address.
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2. Open a browser window and login to the router.
3. Click
Firewall/Security
, then
Port Mapping
. This displays
the
Port Mapping
screen (see Figure 20), which shows the
status of existing port mappings. When you first open this
screen, it will be blank except for the
Enable
field and the
buttons at the bottom of the screen.
Figure 20 Port Mapping Screen
4. In the
Port Mapping
field, select
Enable
. This will enable
all port mappings.
5. To add new port mapping, click the
Add
button. This
displays the
Port Mapping Add
screen (see Figure 21).
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