0
votes
1answer
28 views

Test connection to a port without actually connecting to it

I have a python socket server (single-threaded, accepts only one connection) running somewhere. I connect to that port and do my things. How can I detect whether port is open or closed without ...
0
votes
2answers
42 views

TCP wireless communication

For the pass 2 months, i am trying to establish a wireless communication between 2 devices. Whatever solution i found, got failed due to large number of constraints we have. Seriously posting this ...
0
votes
0answers
120 views

Default Gateway IPv6 but IP set on IPv4

I have a client who has a network setup. I have a couple of devices which work on the network using socket communication which I want integrated onto their network. There is a PC which is to be made ...
0
votes
0answers
16 views

How to keep socket visible after closing the connection?

Is it possible to configure Linux to keep a tcp connection visible for netstat/lsof after being closed? (doesn't matter the connection state). I need to detect it with netstat/lsof but if the ...
0
votes
0answers
33 views

Connecting to a computer inside a network [duplicate]

I have a network in my College which is connected to the internet. How can I access a system inside this network from the internet (WAN)? I don't have access to the gateway of the system, so port ...
3
votes
1answer
322 views

SYN-ACK not received

On a standard TCP connection between server and client, I have this issue: the SYN-ACK is not received from the client, while it is sent from the server. I could see this on Wireshark from both server ...
0
votes
1answer
147 views

How do I bind to a specific link local IPv6 address other than the default?

I'm not 100% sure I'm using the correct terminology in the title, so if someone knows better than I do please amend it. I'm trying to replicate a malicious script that I've seen in the wild for the ...
1
vote
1answer
2k views

How to communicate between two VirtualBox VMs running on same host

I am running two VM instances of RHEL/CentOS on my VirtualBox instance running on host Windows 7. The problem is when I am executing VBoxManage list vms -l | more and then sunsequently VBoxManage ...
0
votes
2answers
57 views

How can 2 or more instances of the same program to communicate in local network? [closed]

I want to create program which will be in use for few computers connected in local network. Basically the program aim is to keep track of all tables in a bar ( lets say ), which are reserved. When ...
0
votes
0answers
63 views

TCP socket performance

There are three Linux Debian machines connected via Gigabit Ethernet router: Server machine A that is the source or HTTP streaming traffic with bandwidth 300 KBps. Proxy machine B that connected to ...
0
votes
0answers
93 views

How to monitor the Remote IP Address to which UDP packets are sent in a particular process?

I am able to do this with NetworkTrafficView or SmartSniff (both from Nirsoft), but on my friends machine (Windows XP), when running this application the internet is just cut off, like the entire ...
1
vote
0answers
41 views

Communicate a button click event with sockets

Desire: I have a device or micro-controller i'll call it a mc that I need to communicate to when a web page button is clicked using sockets. MC1 <button id ='on1' name='mc1'>On</button> ...
0
votes
1answer
372 views

How to explicitly free EADDRINUSE port for binding it again?

$ testOnDemandRTSPServer ... Play this stream using the URL "rtsp://192.168.90.2:8554 ... ^C $ testOnDemandRTSPServer Failed to create RTSP server: bind() error (port number: 8554): Address already in ...
2
votes
1answer
177 views

Simulating a network issue for a specific application

This is somehow a developer question, but as it is more related to operating systems and network connections, I will post it here and not on Stack Overflow. I'm trying to simulate a situation when a ...
2
votes
2answers
6k views

How can i show only 127.0.0.1 traffic using Wireshark?

Every time I try to filter to just show a specific IP Address, I get an error indicating that it is "not an interface or a field." I have no idea what that means. Furthermore, I don’t really see ...
4
votes
1answer
529 views

How does SSH tunneling work at low level?

I am interested in the exact mechanism that occurs when an SSH tunnel is stablished. Supposing we have 3 computers: LOCAL host, INTERMEDIATE host, and REMOTE host, with this topology: Localhost --- ...
-2
votes
2answers
450 views

Meaning of “netcat can be used as a backdoor” [closed]

I recently read about netcat and it is often mentioned that it could be used as a "backdoor". What exactly is meant by backdoor? Could some one give an example of such usage of netcat.
1
vote
1answer
295 views

Restricted ports to non-admins on Windows 7

I work in a restrictive desktop/network environment and I am not an admin on my laptop. The ports available to me are limited. E.g. when I tried running Tomcat, the system refused to open a socket ...
0
votes
3answers
590 views

How to enable ports on a wireless network for java socket programming

Background: I have written a java server-client program. The server accepts incoming connections on port 2175 and writes responses on 2176 which the client listens on for the response. I am sending ...
0
votes
1answer
2k views

Sending Packets to tap0 interface

I've been trying to send packets to a tap interface using python. I'm monitoring the tap interface using wireshark and no packets are being received. I'm doing this as an exercise mainly to help my ...
9
votes
3answers
1k views

Does Windows take care of closing sockets when processes exit?

I've read up this question about Linux, Can a port be bound when the process has terminated? Linux appears to clean up after processes exiting, and leaving open sockets. I was wondering if there's any ...
0
votes
2answers
204 views

is there a single-end available bandwidth measurement tool

i am doing my graduation thesis,currently i need a tool that is capable of measuring the available bandwidth between client and servers.i have googled that, the link ...
6
votes
1answer
2k views

Does Mac OS X throttle the RATE of socket creation?

This may seem programming related, but this is an OS question. I'm writing a small high performance daemon that takes thousands of connections per second. It's working fine on Linux (specifically ...
3
votes
2answers
894 views

Access machine in a subnetwork after a router

Is it possible to access a machine in a sub network? This is the situation: Main-router + sub-router - machine (2) - machine - machine - ... - machine (1) - machine - machine - ... ...
0
votes
3answers
551 views

Power socket networks: setup for home use?

I am planning on setting up a home network when moving into a new apartment. After much bad experience with wireless networks, I was going to go with a wired connection (with cat5's snaking through to ...