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P-661H/HW Series User’s Guide
138
Chapter 7 Network Address Translation (NAT) Screens
7.4.1 Default Server IP Address
In addition to the servers for specified services, NAT supports a default server IP address. A
default server receives packets from ports that are not specified in this screen.
Note:
If you do not assign a
Default Server
IP address, the ZyXEL Device discards
all packets received for ports that are not specified here or in the remote
management setup.
7.4.2 Port Forwarding: Services and Port Numbers
Use the
Port Forwarding
screen to forward incoming service requests to the server(s) on your
local network.
The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers. Please also refer to the Supporting CD for more
examples and details on port forwarding and NAT.
7.4.3 Configuring Servers Behind Port Forwarding (Example)
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (
A
in the
example), port 80 to another (
B
in the example) and assign a default server IP address of
192.168.1.35 to a third (
C
in the example). You assign the LAN IP addresses and the ISP
assigns the WAN IP address. The NAT network appears as a single host on the Internet.
Table 51
Services and Port Numbers
SERVICES
PORT NUMBER
ECHO
7
FTP (File Transfer Protocol)
21
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger
79
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
POP3 (Post Office Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
Summary of Contents for P-661H Series
Page 2: ......
Page 5: ...P 661H HW Series User s Guide Certifications 5...
Page 10: ...P 661H HW Series User s Guide 10 Customer Support...
Page 44: ...P 661H HW Series User s Guide 44 Chapter 1 Getting To Know Your ZyXEL Device...
Page 76: ...P 661H HW Series User s Guide 76 Chapter 3 Wizards...
Page 108: ...P 661H HW Series User s Guide 108 Chapter 5 LAN Setup...
Page 132: ...P 661H HW Series User s Guide 132 Chapter 6 Wireless LAN...
Page 192: ...P 661H HW Series User s Guide 192 Chapter 10 Trend Micro Security Services...
Page 196: ...P 661H HW Series User s Guide 196 Chapter 11 Content Filtering...
Page 202: ...P 661H HW Series User s Guide 202 Chapter 12 Introduction to IPSec...
Page 230: ...P 661H HW Series User s Guide 230 Chapter 13 VPN Screens...
Page 234: ...P 661H HW Series User s Guide 234 Chapter 14 Static Route...
Page 246: ...P 661H HW Series User s Guide 246 Chapter 15 Bandwidth Management...
Page 250: ...P 661H HW Series User s Guide 250 Chapter 16 Dynamic DNS Setup...
Page 280: ...P 661H HW Series User s Guide 280 Chapter 19 System...
Page 290: ...P 661H HW Series User s Guide 290 Chapter 21 Tools...
Page 296: ...P 661H HW Series User s Guide 296 Chapter 23 Troubleshooting...
Page 300: ...P 661H HW Series User s Guide 300 Appendix A...
Page 304: ...P 661H HW Series User s Guide 304 Appendix C...
Page 326: ...P 661H HW Series User s Guide 326 Appendix E...
Page 328: ...P 661H HW Series User s Guide 328 Appendix F...
Page 334: ...P 661H HW Series User s Guide 334 Appendix G...
Page 368: ...P 661H HW Series User s Guide 368 Appendix K...
Page 376: ...P 661H HW Series User s Guide 376 Figure 219 Java Sun...