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This article was written by resident writer Darlene Antonelli, MA. Co-author C. Darlene is a technical writer and editor at Antonelli. Darlene has experience teaching college courses, writing technology articles, and working in technology. She received her Master of Arts degree from Rowan University in 2012 where she wrote a dissertation on online communities and community-generated personalities.
Send Message To Another Computer On Network
Do you want to chat with your friends on LAN? This tells you how to communicate over the LAN using the command prompt. The computers must be connected to the same network to do this.
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This article was written by resident writer Darlene Antonelli, MA. Co-author C. Darlene is a technical writer and editor at Antonelli. Darlene has experience teaching college courses, writing technology articles, and working in technology. She received her Master of Arts degree from Rowan University in 2012, where she wrote her dissertation on online communities and community-generated personalities. This article has been viewed 57,930 times.
2. Enter the following code. “msg /SERVER:DestinationPC * /TIME:60 “This is a message to be sent to a PC called DestinationPC and it will close in 60 seconds” I explained all the bits and bytes explained in my previous post: Ethernet Protocol In this post, two network devices , how it works, and how hackers can use this knowledge.
Before discussing network devices, consider a network without specific network devices. That is, a network using classic Ethernet, where all computers are connected by a single cable.
In this case, when computer A sends a message to another computer (say B), the message is sent over the shared cable and all devices receive it.
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In classic Ethernet, when A sends a message to B, all devices (except A) receive the message (source: summary).
First, overload – all network frames are received by all computers. Suppose A wants to send a frame to B. C also sees this frame, realizes that it is not at its own address, and discards it. This process takes time and resources. Of course the same process happens on machine D.
Second, privacy – if C sees all messages sent from A to B and vice versa, it means privacy has been violated. We will have a network where only A and B can see the messages sent between them.
Third, scalability – this network is not really scalable. We assume that up to 10 computers can be connected to this cable. What if I need to add another computer? The entire cable must be replaced. Expensive and inconvenient.
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Well, it’s probably IT who actually needs to replace the cables. That person is someone who makes sure everything runs smoothly on your network and is pretty much invisible unless something bad happens (at least when you work in an organization with IT staff).
To be clear, we love IT. People We want them to live a good life. We don’t want them running around buying cables all the time.
Fourth, collision – Suppose A wants to send a message to B and C wants to send a message to D. Both can initiate communication at the same time and message
An error occurs in this case. Just like when two people start talking at the same time, it is impossible to understand either of them.
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Fifth, this network structure can induce starvation. Suppose A transmits a frame. Other stations refrain from transmitting data to avoid conflicts. But now machine A takes all the bandwidth to itself and can transmit forever without letting other stations talk. This is called starvation.
A device that only addresses scalability issues is called a hub. A hub is a device with multiple ports to which a single Ethernet cable is connected.
An Ethernet hub is a device containing multiple ports, each connected to a single Ethernet cable (source: summary).
Now we have multiple computers connected instead of one cable with multiple ports. There is a single hub and each computer is connected by a single cable. This makes the life of an IT person very easy.
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The hub simply takes the received pulses and multiplies them. i.e. send to all other ports. For example, if A sends a frame to B, the hub forwards the frame to all ports B, C, and D except A’s ports.
Hubs don’t understand Ethernet and don’t know anything about MAC addresses. In the case of a hub, every bit is the only bit transmitted over the wire, and these bits must reach all other ends.
The hub simply takes the bitstream and multiplies it on all ports except the source port (source: summary).
Now, if you need to add a new computer to your network, you can connect it to the hub.
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What if the hub runs out of ports? No problem. I’ll connect it to another hub like this:
All other issues still remain, though, at least in Classic Hub. Because every computer receives frames sent from A to B, there is no privacy, the network is overloaded, there can be collisions, and there is a risk of network exhaustion.
What we really want is a device that when A sends a frame to B, it sends that frame to B and B only. This device is called a switch.
All stations are connected by switches, and when A sends a frame to B, only B receives it.
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Using a switch, when A sends a message to B, only B receives it (source: summary).
This means that all issues have actually been resolved. Because each frame only reaches the relevant receiver, the device is not overloaded. There is no privacy issue as only A and B can see the frames except for the switch. You can easily expand your network by adding additional switches as needed.
Because each connection between a switch and an endpoint is a single collision domain, the switch can avoid collisions. That is, the switch prevents sending more than one frame on the wire at the same time.
Likewise, B and C can communicate with each other while A is sending data, so no starvation occurs. Even if it continues to send static frames to the entire network where A is the broadcast address, the switch can relay messages from other hosts in the middle.
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Let’s say you just bought a new switch and plugged it into your network. A sends a frame to B. How does the switch know where computer B is?
An alternative is to manually configure the switch. That is, create a table mapping between MAC addresses and corresponding ports and have someone manually configure that table.
, we usually use IT. People and we love IT. People we don’t want to make them do this hard thing every time.
Also I don’t know about you, but most people have IT in general. Whenever someone at home connects a device to the network.
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Another option is to send a special message from the switch to each port and then the endpoint responds with its MAC address. The main downside here is that you now have to make all devices aware of the switch. You need to change the behavior of your device to respond to certain messages.
It would be nice if the switch was transparent. The endpoints don’t need to know that the switch exists, but it will still work.
Consider this network where a new switch has just been added to the network. The switch stores a table and maps MAC addresses to physical ports. This table is empty.
When a switch joins a new network, the table mapping MAC addresses to physical ports is empty (source: summary).
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The switch understands Ethernet and can read the source address by looking at the frame header. Because this source address maps to “A” and the message is sent on physical port number 2, the switch adds a mapping of A’s MAC address to port number 2 to its table.
When machine A sends a frame, the switch examines the frame, reads the source address and maps it to the corresponding physical port (source: summary).
But what does the switch do with the frame? Well, right now the switch doesn’t know where B is, so the switch simply multiplies the frame and sends it to all ports like a hub does. So for now B, C and D receive all frames.
The switch’s table doesn’t contain a record for B, so frames destined for B are actually sent to everyone.
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