Which program is sending data

You can choose to list active, inactive, hidden or all processes and clicking on the tree icon for the process will show its ID and all the active connections for it along with their individual speeds. Net Limiter installs as a trial of the shareware traffic management software, you need to register for a free serial key to turn the program into the free monitor.

Download Net Limiter Monitor. Made by the same developer as Process Explorer, TCPView is a simple endpoint viewer to show all active connections on the computer. It displays the local and remote addresses and ports, sent and received data amounts and also the current state of the connection. New connections show in green, changed in yellow and closed in red. You can also end the chosen process or connection by right clicking on the entry and save the window contents to a text file.

Works on XP and above. Clicking on a process can kill it, close the active connection, copy the address and an interesting feature which is a primitive IP blacklist which will block any IP address you add to it. Works on Windows XP and above. Download TCPMonitor. ConnectionWatcher is another simple to use tool that displays all the connections made by the processes on your computer and has around 15 different skins to make the interface more appealing.

It does have a small overall network monitor and graph at the bottom, and also a useful log tab where you can record and save up to events to a HTML file. You can also set the auto update refresh to real time if needed, but it will put extra load on the CPU.

A useful option the program could do with is the ability to filter out things like UDP, listening or closed connections etc. Works on Windows XP and above with portable or setup installer versions available. Download Moo0 ConnectionWatcher. Simply right click on the tray icon and select NetStat to open the connections window. Right click on a program and click Terminate to quickly close it.

How to do that in Mac? Improve this question. Sato Sato 2 2 gold badges 6 6 silver badges 7 7 bronze badges. Take a look at Activity Monitor's Network tab? Add a comment. Active Oldest Votes.

Activity Monitor Activity Monitor measures how resources are being used by different processes or applications on a Macintosh. Improve this answer. Jaime Santa Cruz 4, 5 5 gold badges 22 22 silver badges 51 51 bronze badges. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. The physical connection through the phone network to the Internet Service Provider might have been easy to guess, but beyond that might bear some explanation.

The ISP maintains a pool of modems for their dial-in customers. This is managed by some form of computer usually a dedicated one which controls data flow from the modem pool to a backbone or dedicated line router. This setup may be refered to as a port server, as it 'serves' access to the network.

Billing and usage information is usually collected here as well. From here the packets will usually journey through several routers and over several backbones, dedicated lines, and other networks until they find their destination, the computer with address 5. But wouldn't it would be nice if we knew the exact route our packets were taking over the Internet? As it turns out, there is a way This one is called traceroute and it shows the path your packets are taking to a given Internet destination.

Like ping, you must use traceroute from a command prompt. In Windows, use tracert www. From a Unix prompt, type traceroute www. Like ping, you may also enter IP addresses instead of domain names. Traceroute will print out a list of all the routers, computers, and any other Internet entities that your packets must travel through to get to their destination. If you use traceroute, you'll notice that your packets must travel through many things to get to their destination.

Most have long names such as sjc2-core1-h These are Internet routers that decide where to send your packets. Several routers are shown in Diagram 3, but only a few. Diagram 3 is meant to show a simple network structure. The Internet is much more complex. Internet Infrastructure The Internet backbone is made up of many large networks which interconnect with each other. These networks peer with each other to exchange packet traffic.

NAPs were the original Internet interconnect points. Below is a picture showing this hierarchical infrastructure. Diagram 4 This is not a true representation of an actual piece of the Internet. None of the physical network components are shown in Diagram 4 as they are in Diagram 3.

This is because a single NSP's backbone infrastructure is a complex drawing by itself. Most NSPs publish maps of their network infrastructure on their web sites and can be found easily.

To draw an actual map of the Internet would be nearly impossible due to it's size, complexity, and ever changing structure. Does every computer connected to the Internet know where the other computers are? Do packets simply get 'broadcast' to every computer on the Internet? The answer to both the preceeding questions is 'no'.

No computer knows where any of the other computers are, and packets do not get sent to every computer. The information used to get packets to their destinations are contained in routing tables kept by each router connected to the Internet. Routers are packet switches.

A router is usually connected between networks to route packets between them. Each router knows about it's sub-networks and which IP addresses they use.

The router usually doesn't know what IP addresses are 'above' it. Examine Diagram 5 below. The black boxes connecting the backbones are routers.

Under them are several sub-networks, and under them, more sub-networks. At the bottom are two local area networks with computers attached. Diagram 5 When a packet arrives at a router, the router examines the IP address put there by the IP protocol layer on the originating computer. The router checks it's routing table. If the network containing the IP address is found, the packet is sent to that network.

If the network containing the IP address is not found, then the router sends the packet on a default route, usually up the backbone hierarchy to the next router. Hopefully the next router will know where to send the packet. If it does not, again the packet is routed upwards until it reaches a NSP backbone.

The routers connected to the NSP backbones hold the largest routing tables and here the packet will be routed to the correct backbone, where it will begin its journey 'downward' through smaller and smaller networks until it finds it's destination.

What if the you need to access a web server referred to as www. How does your web browser know where on the Internet this computer lives? The DNS is a distributed database which keeps track of computer's names and their corresponding IP addresses on the Internet. Many computers connected to the Internet host part of the DNS database and the software that allows others to access it. These computers are known as DNS servers.