I would like to directly access to syslog messages from Python by reading /dev/log. My (very limited) understanding is that the correct way is to read from there is to bind a datagram socket. im...

I'm planning to use an instance of DatagramSocket and call its send method from different threads... to send UDP packets to different clients. Is the method thread safe i.e. calling this method fro...

As I recently found this paper describing a sniffing mechanism for iOS using Apple's NEPacketTunnelProvider Extension, I got curious and it made me want to understand it from a technical point of v...

Has anyone used DTLS on Android or is there an open source Java implementation that supports DTLS? What are my other options for securing UDP traffic on Android?

In my application, I have one process (the "writer") reading data from external hardware. This process should supply consistent packets to several "readers". Question: How can one process send con...

What's the difference between sockets (stream) and sockets (datagrams)? Why use one over the other?

I am building a UDP-based application that receives and sends multiple packets. I could build a new DatagramPacket for each send, or I recycle one instance for the life of my application. Are ...

Is it true that upon receiving a segment from Transport Layer(TCP) towards Network Layer(IP) the resulting data unit will be a packet. Whereas when receiving a user datagram from Transport Layer(UD...

Trying to convert a received DatagramPacket to string, but I have a small problem. Not sure what's the best way to go about it. The data I'll be receiving is mostly of unknown length, hence I hav...

While experimenting with broadcast messages (on a Debian 8.3 VM running on VirtualBox 5.0.14 on a Windows 7 laptop) I found that netcat (nc) receives only the first broadcast message. It does not r...

byte [] r = new byte[4096]; DatagramPacket dpr = new DatagramPacket(r, r.length); sock.receive(dpr); After the receive, will dpr.getData() & r always be the same? ex: Can I directly use the by...

For receiving UDP broadcast packets from the server to an android device, i used a service class and listen for packets in a thread. It receives the packet successfully. The problem is that if mult...

I would like to establish an IPC connection between several processes on Linux. I have never used UNIX sockets before, and thus I don't know if this is the correct approach to this problem. One pr...

I want to use DTLS (on OpenSSL) using JNI on Android 2.1/2.2. Can someone help me get started (tutorials, howto, pointers etc) with building OpenSSL for Android (2.1/2.2) using the Android NDK? ...

I was working with a MulticastSocket and when ever I tried to join a group, it would never work when I was running the group on the "localhost" ip. However, I found this article http://lycog.com/pr...

Here's simple case when binding to all ip interfaces and specific udp port: int bindPort = 5555; // example, udp port number DatagramSocket socket = new DatagramSocket(bindPort); byte[] receiveDa...

I know the maximum length of a datagram queue length can be found using "cat /proc/sys/net/unix/max_dgram_qlen". I wanted to know how to find the default value that is set on boot up (like in ca...

My target is to have a push-to-talk chat app in GSM/UMTS/LTE networks; initially I wanted use multicast addresses and peer-to-peer without overload the server; unfortunatly, after deep investigatio...

I am trying to send UDP with datagram in JAVA and my machine have several NIC with different IP's. How can I set which NIC I want my packet to be sent from ?? (assuming I have more than one on the...

I'm trying to implement a simple library that can discover the router through UPnP protocol if the application is running in a NAT environment. I have tried two ways, multi-cast and datagram, for s...

I get a feeling that I am missing something really obvious here. The overall structure of my system makes me want to use a blocking DatagramChannel without Selectors, in order to keep things simpl...

OK this is one I've been trying to figure out for a few days now. We have an application on Windows Phone 7 where phones join a multicast group and then send and receive messages to the group to ta...

I'm writing a chat program in java and I have been stuck for hours with this problem. This is my class that waits for clients to connect to the server. Every time a new client connects I create a ...

Which one does ioctl of FIONREAD return, the next packet's length, or the length of all data in the buffer? Suppose there is a UDP server that receives 2 packets from a client 1 and another ...

Non-blocking TCP/IP SocketChannels and Selector in NIO help me to handle many TCP/IP connections with small number of threads. But how about UDP DatagramChannels? (I must admit that I'm not very fa...