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Chapter 7 NAT
PMG5318-B20A User’s Guide
74
Many residential broadband ISP accounts do not allow you to run any server processes (such as a
Web or FTP server) from your location. The ISP may periodically check for servers and may suspend
your account if it discovers any active services at your location. If you are unsure, refer to the ISP.
The basic rules of port forwarding are:
• If NAT is enabled, you must configure a port forwarding rule if you want traffic on the WAN to find
computers on the LAN.
• A port forwarding rule can only forward TCP and UDP traffic.
• If NAT is disabled, the GPON Device will route packets based on the information in the NAT
routing table.
7.2.1 Default Server IP Address
You can assign a default server IP address to which the GPON Device can forward traffic for all
protocols, such as TCP, UDP, ICMP (ping), ESP, and so on, that do not match an existing port
forwarding rule.
Note: If you do not assign a Default Server IP address, the GPON Device discards all
packets received for ports that are not specified in a port forwarding rule or in the
remote management setup.
7.2.2 Port Forwarding: Services and Port Numbers
Use the Port Forwarding screen to forward incoming service requests to the server(s) on your
local network.
7.2.3 Pinging a Device Behind NAT From the WAN (Example)
Imagine that you want to ping a device on the LAN behind your GPON Device from a remote
location on the WAN while NAT is enabled.
You cannot create a port forwarding rule for ping because ping uses the ICMP protocol; port
forwarding can only handle the TCP and UDP protocols.
Summary of Contents for PMG5318-B20A
Page 8: ...Table of Contents PMG5318 B20A User s Guide 8 ...
Page 14: ...Chapter 1 Introduction PMG5318 B20A User s Guide 14 ...
Page 20: ...Chapter 2 The Web Configurator PMG5318 B20A User s Guide 20 ...
Page 44: ...Chapter 5 LAN PMG5318 B20A User s Guide 44 ...
Page 70: ...Chapter 6 Wireless LAN PMG5318 B20A User s Guide 70 ...
Page 80: ...Chapter 8 Quality of Service QoS PMG5318 B20A User s Guide 80 ...
Page 96: ...Chapter 10 Phone Usage PMG5318 B20A User s Guide 96 ...
Page 102: ...Chapter 11 USB Services PMG5318 B20A User s Guide 102 ...
Page 117: ...Chapter 12 Remote Management PMG5318 B20A User s Guide 117 ...
Page 118: ...Chapter 12 Remote Management PMG5318 B20A User s Guide 118 ...
Page 122: ...Chapter 13 Static Route PMG5318 B20A User s Guide 122 ...
Page 126: ...Chapter 14 Dynamic DNS PMG5318 B20A User s Guide 126 ...
Page 144: ...Chapter 17 Logs PMG5318 B20A User s Guide 144 ...
Page 150: ...Chapter 19 Diagnostic PMG5318 B20A User s Guide 150 ...
Page 164: ...Appendix B Legal Information PMG5318 B20A User s Guide 164 ...