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How can propagation time be greater than transmission time?
Transmission time = time it takes to send (dispatch) the data. Propagation delay = time it takes for the data to reach the other side. Source For example, suppose you're sending 10 bits of data from the North Pole to the South Pole. If, for example, your computer (which is very old) has a 1bit/ms bit rate for sending, the transmission time would be 10ms. However, due to the length and the grea

Categories : Networking

Two computer on a same IP?
Use unique ports for the clients and servers running on the same machine. In addition 127.0.0.1 is localhost (internal to that machine). Computer B cannot communicate with 127.0.0.1 on Computer A. Use 127.0.0.1 if all applications or on the same machine. Use the computers actual IP address if you want external machines to be able to communicate with the server.

Categories : Networking

adaptive jitter buffer without packet loss
With companding. When jitter clears up, you merge packets and 'accelerate' the buffer. Merge offcourse will need appropriate handling, but the idea is to pop 2 20ms packets from ajb and creating a 30ms packet. you keep doing this until your buffer levels are normal. Similarly for underrun, packets can be 'stretched' in addition to introduction of latency.

Categories : Networking

dual public IPs for same adsl connection?
I figured out the issue by myself. IT cant have 2 public ip for the same device(router in my case} at the same time. The thing was the servise provider has issued me some generated ip and it is not a public ip. I was behind a NAT. So when i called them, they allowed my roter to get a real public ip and that solved the issue. thanks

Categories : Networking

openMPI/mpich2 doesn't run on multiple nodes
Usually this is caused because you didn't set up a hostfile or pass the list of hosts on the command line. For MPICH, you do this by passing the flag -host on the command line, followed by a list of hosts (host1,host2,host3,etc.). mpiexec -host host1,host2,host3 -n 3 <executable> You can also put these in a file: host1 host2 host3 Then you pass that file on the command line like so:

Categories : Networking

Raspberry Pi - run a program with specified internet connection
Well, it seems that I should use network namespaces. Here are the links, that may be helpfull to visitors of this question. I didn't find another ways how to do it. link one link two link three

Categories : Networking

Can someone tell me the benefits of using a public subnet?
I work for an ISP and we allocate public subnets to client that require port forwarding within their local network. In my case, we own the routers on site and customers do not have access to them, this means any time they would like to do a port forwarding they would need to call in a place a ticket. However if you have your own public subnet, then you can connect your own router to this and do

Categories : Networking

Restarting CoreOS missing files
Files on disk shouldn't disappear on you like that. Did you happen to PXE-boot this VM or somehow use a file system in RAM? A better way to do this config is with cloud-config, which CoreOS uses to configure machines at boot. It's intended to provide a repeatable way to set up networking, mount disks and things like that. The steps that you completed manually can be done with cloud-config like th

Categories : Networking

What is the difference between a physical address and MAC address in networking?
Physical address and MAC address are indeed the same. They are used to communicate between devices on Ethernet networks. When you send a request to a remote host's IP address (access a website for instance) your computer sends that request to your LAN's gateway (your router) and it uses its physical (MAC) address as the destination of the message but the logical (IP) address of the host for its fi

Categories : Networking

Run a hadoop cluster on docker containers
I did this with two containers running master and slave nodes on two different ubuntu hosts. I did the networking between containers using weave. I have added the images of the containers on docker hub account div4. I installed hadoop in the same way, as its installed on different hosts. I have added the two images with coomands to run haddop on them here: https://registry.hub.docker.com/u/div4/h

Categories : Networking


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ping issue in Mininet custom topology
How can propagation time be greater than transmission time?
Two computer on a same IP?
adaptive jitter buffer without packet loss
dual public IPs for same adsl connection?
openMPI/mpich2 doesn't run on multiple nodes
Raspberry Pi - run a program with specified internet connection
Can someone tell me the benefits of using a public subnet?
Restarting CoreOS missing files
What is the difference between a physical address and MAC address in networking?
Run a hadoop cluster on docker containers
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