The network configuration allows you to change several aspects of how your system behaves on the network.
The listen port is the tcp/udp port number on which Bunzilla listens for incoming connections. As a general rule, you should leave the listening port at the default value of 30031. The following are reasons why you might want to change your port:
Reasons for not changing the default port:
Bunzilla also allows you to limit your transmit speed and receive speed. By default, the transmit and receive speed are not limited. Limiting either transmit or receive speed will decrease your overall performance and will result in slower searching and downloading. Limiting your transmit speed while leaving your receive speed unlimited WILL NOT result in faster file downloading. The incorrect assumption is that by limiting transmit speed, you are limiting the amount of uploading from your system, which makes more of your network bandwidth available for downloading. Searching for files and downloading files both involve transmitting requests to locate files and acknowledgements of data received. Those transmissions will be queued up being file uploading activity. The net result will be slowed uploads, slowed downloads, and unutilized network bandwidth. The primary reason to limit network utilization would be when you want to leave the program running in the background for an extended period of time or perminently. Since you wouldn't be interactively waiting on down to complete, slower downloading may be acceptable to you and you may want to ensure that some or most of your bandwidth is available for web surfing or other activities. Some reasons you might want to leave Bunzilla running are:
Note that these numbers are based on kilobytes and megabytes, not bits. Often times internet providers describe their services in megabits rather then bytes. It makes their service sound faster then they really are. There are 8 bits to a byte. In addition, networking protocols add additional bytes of data to transmission and reception. A very rough rule of thumb is to assume 10 bits to the byte to make the math easy. So if you have a 5 megabit per second download speed, you actually have something a bit less then 500 kilobyte (half megabyte) per second maximum download capacity. Keep in mind that most protocols introduce some level of delay between packets. So, if you are downloading from multiple sources concurrently, you might be able to approach this theoretical maximum speed. If you are downloading from a single source, you should expect slower speeds then whatever maximum you specify. Also keep in mind that download speed is also limited by the slowest link between you and whoever you are uploading from. Thus if the person on the other end has a 2 megabit per second upload speed, you won't download any faster then 2 megabits per second from that person. This is one of the reasons many p2p programs download from multiple sources. Most home internet services providers support upload speeds that are significantly less then their download speed.