Chapter 10 Network Address Translation (NAT)
VMG1312-B10C User’s Guide
164
10.8.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical LANs
using IP alias) behind the Device can communicate with three distinct WAN networks.
Figure 86
NAT Application With IP Alias
Port Forwarding: Services and Port Numbers
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.
Table 64
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 VMG1312-B10C
Page 4: ...Contents Overview VMG1312 B10C User s Guide 4 Diagnostic 265 Troubleshooting 271 ...
Page 14: ...Table of Contents VMG1312 B10C User s Guide 14 ...
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 22: ...Chapter 1 Introducing the Device VMG1312 B10C User s Guide 22 ...
Page 33: ...33 PART II Technical Reference ...
Page 34: ...34 ...
Page 64: ...Chapter 5 Broadband VMG1312 B10C User s Guide 64 ...
Page 100: ...Chapter 6 Wireless VMG1312 B10C User s Guide 100 ...
Page 124: ...Chapter 7 Home Networking VMG1312 B10C User s Guide 124 ...
Page 166: ...Chapter 10 Network Address Translation NAT VMG1312 B10C User s Guide 166 ...
Page 176: ...Chapter 12 Interface Group VMG1312 B10C User s Guide 176 ...
Page 192: ...Chapter 14 Firewall VMG1312 B10C User s Guide 192 ...
Page 198: ...Chapter 16 Parental Control VMG1312 B10C User s Guide 198 ...
Page 208: ...Chapter 18 Certificates VMG1312 B10C User s Guide 208 ...
Page 211: ...Chapter 19 VPN VMG1312 B10C User s Guide 211 Figure 121 IPSec VPN Add ...
Page 224: ...Chapter 20 Log VMG1312 B10C User s Guide 224 ...
Page 234: ...Chapter 24 IGMP Status VMG1312 B10C User s Guide 234 ...
Page 238: ...Chapter 25 xDSL Statistics VMG1312 B10C User s Guide 238 ...
Page 242: ...Chapter 27 User Account VMG1312 B10C User s Guide 242 ...
Page 248: ...Chapter 30 TR 064 VMG1312 B10C User s Guide 248 ...
Page 252: ...Chapter 31 Time Settings VMG1312 B10C User s Guide 252 ...
Page 264: ...Chapter 35 Configuration VMG1312 B10C User s Guide 264 ...
Page 270: ...Chapter 36 Diagnostic VMG1312 B10C User s Guide 270 ...
Page 288: ...Appendix B Legal Information VMG1312 B10C User s Guide 288 ...