![]() If few of those words make sense now, hopefully they will soon. This is called port forwarding, and Tomato offers four basic kinds of port forwarding configuration: basic, DMZ (de-militarized zone), triggered, and UPnP/NAT-PMP. If your router is running Tomato firmware, you can configure how it manages particular kinds of data so that it travels the correct route. This ensures that data coming into your network from an outside machine reaches the correct destination, and that outgoing data enjoys the same. One job of a router is to navigate data from external to internal ports and vice versa. ![]() In custom configurations you can sometimes use non-standard ports, but most applications stick to the standard port assignments. Meanwhile, port 21 is used for FTP and port 110 for POP3 e-mail. Many network applications are assigned to specific ports-besides port 80, port 443 is used for HTTPS, or secure Web communications. For example, if your computer contacts the Web server of a remote computer, it usually knocks at the door of port 80, because this is where most Web servers “live.” ![]() When two computers connected via the Internet want to talk to one another, they do so through a channel called a “port.” If each computer were an apartment building, a port would be a particular apartment.
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