I want to implement an IP stack in C++ as a training project for me to the Linux and networking world. I have some knowledge of how the Linux IP stack works, but, as I said I want to implement something in C++ which has a good design rather then focusing on performance. Does anyone know where I can find written design for IP stacks writ...
I am working on an very old application right now. I need to make change in this application to listen for coming icmp request and decide to reply or drop the packet (kind of access control on ICMP). The application is Winsock version 1.1 based. I tried different ways to create a socket and capture icmp packet using the socket. But none ...
Client close the socket first, when there is not much data from server, tcp connection shutdown is okay like: FIN --> <-- ACK <-- FIN, ACK ACK --> When the server is busying sending data: FIN --> <-- ACK,PSH RST --> And the server connection comes to CLOSE_WAIT state and hang on there for a long time. What's the problem ...
I am getting into HTTP protocol specifics and I would like to see/understand the calls my browser makes as it is being used. I use Firebug (with Firefox) to look at/debug AJAX interactions, etc, but don't see the full HTTP conversation. Is there something similar for viewing HTTP commands issued by a browser? ...
An HTTP application request for www.stackoverflow.com. This message is passed to Transport layer. Transport layer adds its header and sends the packet to Internet Layer. The Internet Layer cannot see www.stackoverflow.com as it can only access the header which was appended by Transport Layer. Then how can Internet Layer decide route for ...
Question about the MAC-protocol of 802.11 Wifi. We have learned that when a station has received the data it waits for SIFS time. Then it sends the packet. When searching online the reason that is always mentioned is to give ACK packets a higher priority. This is understandable since a station first has to wait DIFS time when it wants t...
Hello. I'm working with Microchip's TCP/IP stack and the host name of my device is not being broadcasted, although I can access it using its DHCP assigned IP. So the question is, what is the protocol that a network device uses to broadcast its host name, so that when I see a list of devices in a network I can identify it by name? ...
I'm faced with a following dilemma: Design a new network protocol which would be used between a server (Java software) and desktop and mobile clients. The mobile clients include J2ME, Android and maybe in the future even iPhone. The data stream is a realtime, constant stream with also more infrequent parts. The clients show waveforms o...
I'm trying to get a listing of machines in my local domain, specifically ones running a administrative web service (_asip-webadmin). I've been fooling with NSNetService but it would seem that it's only good for Bonjour listings (as I can trap them just fine). I've tried something along the lines of: [mySearch searchForServicesOfType:@"_...
I want to send a file in C++ over network (for a chat program) what should I do? ...
My webapp received a request from 10.18.255.249 (but the 10.0.0.0/9 cidr block is reserved) according to https://www.arin.net/knowledge/rfc/rfc1918.txt How is this even possible? ...
My task is to make a networking application with protocol identification, under a proprietary license. I am considering reusing the protocol matching patterns from l7-filter, but not l7-filter itself. These data files are available under a dual GPLv2/CC-ShareAlike 2.5 license. The CC license says I can't "build upon" it, but is it OK to...
What kind of SCTP support is there on various Windows versions? ...
While opening a TCP connection , the initial sequence number is to be derived using ToD clock that keeps running even when the host is down. The low order 32 bits of the counter of the ToD clock is to be used for the initial seq no. The clock counters increments once per milli second. The maximium packet lifetime is given to be 64s. Wh...
I have two computers in geographically dispersed locations, both connected to the internet. On each computer I am running a Python program, and I would like to send and receive data from one to the other. I'd like to use the most simple approach possible, while remaining somewhat secure. I have considered the following solutions, but I'...
When you read a closed TCP socket you get a regular error, i.e. it either returns 0 indicating EOF or -1 and an error code in errno which can be printed with perror. However, when you write a closed TCP socket the OS sends SIGPIPE to your app which will terminate the app if not caught. Why is writing the closed TCP socket worse than re...
SCTP has native multi-homing support which if I understand it correctly will automatically reroute your packets over a secondary NIC if the primary interface goes down. I duplicated this functionality with TCP by writing a custom routing deamon to modify the routing tables if my primary NIC goes down. I would like to try using SCTP ins...
This is related to the question: SCTP with Multihoming as a Drop In Replacement for TCP I have a simple echo client / concurrent server app that ran perfectly fine using TCP. I could pipe a file to stdin on the client and the client would receive all the data back, call select which would return 1 indicating the socket was readable, t...
I would like to write an application like a netstat - to show all the active connections and the open ports respectively. The problem is that I don't know how to do it - I've done some network programming but in general it was some simple server-client packet and simple TCP and UDP packets sending/receiving. I looked at the netstat cod...
I'm new to understanding how interprocess communication works. I"m working with two applications on my localmachine, a Source Application and a Server Application. The Source application broadcasts files through a configured port on my pc. The Server application listens for those files and exposes them to the internet for users to stream...