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Examples of well-known and registered port numbers are shown below. For further information, please
see IANA’s website at http://www.iana.org/assignments/port-numbers
Well-known and Registered Ports
SSH Remote Login Protocol
SMTP (Simple Mail Transfer Protocol)
TFTP (Trivial File Transfer Protocol)
POP3 (Post Office Protocol Version 3)
Using port forwarding does have security implications, as outside users will be
able to connect to PCs on your network. For this reason you are advised to use
specific Virtual Server entries just for the ports your application requires,
instead of using DMZ. As doing so will result in all connections from the WAN
attempt to access to your public IP of the DMZ PC specified.
If you have disabled the NAT option in the Interface Setup - Internet section, the
Virtual Server function will hence be invalid.
If the DHCP server option is enabled, you have to be very careful in assigning
the IP addresses of the virtual servers in order to avoid conflicts. The easiest
way of configuring Virtual Servers is to manually assign static IP address to
each virtual server PC, with an address that does not fall into the range of IP
addresses that are to be issued by the DHCP server. You can configure the
virtual server IP address manually, but it must still be in the same subnet as the
router.
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