all!
Now I'm working on a p2p file share program in LAN(I use python). This program need to send multicast to other peers, and talks to others. But I have only one laptop, so how can I simulate two peers' communication in one computer. The peers use the same port and same multicast port
You can make each peer to use a different port!
Pass the port number as a command line parameter, and if its not provided then default to the one you are using currently.
This way when you can run in an environment with multiple machines you won't have to do anything additional, neither will your app users have to pass the port parameter.
Alternatively you can use ModelNet.
Related
First of all, I wanna say that I don't have much experience in advanced networking on Linux.
A have a task to deploy our .deb packages in containers, and applications are mostly tunned for operating on localhost while being designed with the capability of operating onset of server machines (DB, application, client, etc), but since components of the app have been distributed between containers, I need to make it work together. The goal is to do it w/o any pre-setup sequences that change the IP address in configs for components since target IP is uncertain and IP alias in /etc/hosts may not solve the problem.
Could I somehow intercept outbound connection to localhost:5672 and forward it to, we say, 172.18.0.4:5672 with the ability to correctly receive incoming traffic from the resource we forwarded to? Can you give me some examples of the script?
I'm not very well versed in any scripting languages, but I have been asked to create a software solution for live replay using the Blackmagic Hyperdeck (if anyone knows what that is) that can accept a series of predefined commands over TCP. I decided to start this task in Pythion, only because it is what I know best I researched the documentation for socket, but I need to send the command out to three different "servers". They all operate off of different ips, but have the same port. How would I go about doing this?
I am to Electron and nodejs
And stuck here, actually i m making a desktop app to control every PC in network. which tells me the ip and mac of computers in the network. But now I need to talk to it and push/get some message. but how ?
Socket.io is likely the easiest way to do what you are trying to do. It'll allow you to communicate between the machines with a relatively low amount of effort.
Sockets generally work on a "server" and "client" basis, so you may want a central server that will coordinate with the clients.
This blog post from node source provides a really good intro to using them.
I'm working on a project where I have two Debian VMs that both have Pymodbus installed. I'm trying to setup a virtual testing environment where I can perform various cyber attacks on the two from a third Kali VM while they communicate. Unfortunately, I'm very new to unix and PLC programming, and am having some difficulty getting the two to communicate with each other. Ideally, the master should send data to the slave, who then updates some information and sends a response back. Does anyone know how to begin to get these two to work together? I'm really at a loss here, and I have no idea where to begin. Thank you so much, I really appreciate it.
I got pymodbus from here: https://pypi.python.org/pypi/pymodbus
Documentation located here: https://github.com/riptideio/pymodbus
P.S. I used pip to install the above .whl file, but I've seen other people install pymodbus by simply running a command, which makes me worry that I've done this all wrong.
You can run a test in one Debian VM system.
1. run the server file, and set the ip and port.
2. run the client file, and connect to the ip and port.
That is tcp/ip method and you can do serial method by the same file.Just look the comments in the above files. If any questions, let me know.
server picture:
client picture:
updated:
1.connect two PCs by local area network.Make sure two PCs can ping each other.
2.set synchronous-server.py:
StartTcpServer(context, identity=identity, address=("0.0.0.0", 5020))
which means listen all the coming connection requests from all ip.
3.setsynchronous-client.py(let's assume the server pc ip is "192.168.1.10", you should replace this ip to real server ip):
client = ModbusClient('192.168.1.10', port=5020)
4.run the two py files and it should works now.
I am using an android app that streams real-time accelerometer data to the specified ip address of a server. I have written a "server" in C running on Linux which is running in VMware.
I am connected to the hotspot created by the Windows7(Host machine) running the VMware Workstation.
So my question is how do I connect the virtual-machine to same network as the hotspot so that I can get the phone and the "server" program on the same network and stream data to the server program?
I use VirtualBox, but I'm guessing the settings are very similar in VMWare Workstation.
You probably need to do one or both of these things:
1) Port Forwarding. If your app is hitting port 80 (or whatever port), you'll need to tell VMWare that any hits coming in to the host machine on that port get forwarded to the VM. Of course, your VM will have to be listening on that port. I'd suggest using a high port number (over 1024) to minimize conflicts, and avoid annoying root/admin issues using a low port number.
2) Hopefully that gets you there. If not, you may need to change the virtual adapter settings on the VM. NAT mode is a good first try. If not, there are other modes (bridged, internal, host-only) you can tinker with. (Not sure if VMWare uses different names)
That's probably all you need for the topology you describe -- Android device connected directly to the same subnet as the host machine. If not, perhaps your hotspot routes all client traffic to the gateway (i.e. out to the Internet), without allowing direct access to localhost. If so, maybe there are settings for that. If not, ngrok is your new best friend.
It is SUPER easy and allows you to tunnel traffic from anywhere on the Internet to a specific service running on your machine. This would sidestep some of the issues above.
If you want to take your Android device to another network (e.g. cell network), then ngrok is absolutely the way to go, particularly for development and prototyping. This lets you avoid issues with DNS, routing, firewalls, etc.