Archive for the ‘tcpip’ Category

Pushing VLAN tags through unmanaged switches

Friday, March 21st, 2014

Kenneth Finnegan writes: This year, I was designated as the computer network zonie, so it's my job to make sure that there's IP connectivity between all the major sites in the network. This involves building a computer network that includes a couple Internet hand-off points, multiple routers, several medium-range (2-5km)...

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Posted in tcpip | 2 Comments »

Arduino WiFi shield

Saturday, August 18th, 2012

Arduino fans can now take their hacking projects to a new level with the release by the Arduino crew of their WiFi shield. The shield is designed around an Atmega 32UC3 32bit microcontroller which controls the WiFi stack and the HDG104 from H&D Wireless. The Arduino communicates over SPI with...

Posted in Arduino, open source, tcpip, wireless | 17 Comments »

Tutorial: Nut/OS on Altera FPGA

Sunday, August 12th, 2012

Michael Fischer of emb4fun has a new tutorial on using Nut/OS on Altera FPGAs. His design uses the Altera DE0-Nano board and a self-made adapter equipped with a DM9000E-H board, and includes a short example for an Internet Radio. Michael's tutorial is divided into three parts linked below: Part 1,...

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Posted in code, FPGA, tcpip, tutorials | 1 Comment »

Lower Webduino server overhead with a favicon.ico

Monday, January 2nd, 2012

Martin Lormes recently acquired an Arduino and Ethernet shield. Once he got the setup running on the web using the Webduino Arduino web server library, he checked the traffic using Wireshark and noticed that if the embedded server didn't offer up a favicon.ico file when initially requested the browser would...

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Posted in Arduino, code, tcpip, web platforms | 2 Comments »


Monday, December 26th, 2011

While most of us are familiar with packet capturing/sniffing programs such as Wireshark, it's not always the most convenient or appropriate tool to use in every network monitoring situation. Henry Van Styn has written an excellent how-to tutorial on the uses of the Linux command line utility TCPDUMP, and why...

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Posted in documentation, Linux, surveillance, tcpip | No Comments »

Free O’Reilly webcast: Core Network Protocols

Tuesday, October 11th, 2011

O'Reilly is offering a free webcast on "Core Network Protocols: Two techniques you need to know." The 60 minute presentation by Bruce Hartpence will be live this Friday, October 14, 2011, at 1 PM PT. In this webcast we'll talk about address space, the purpose of the network mask and...

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Posted in talks, tcpip | 1 Comment »

How to build still another passive ethernet tap

Sunday, August 28th, 2011

firestorm_v1 from yourwarrantyisvoid has published this detailed tutorial on building and using a passive ethernet tap. His goal in this project is to facilitate network monitoring for intrusion detection purposes, and wanted hardware which will allow the monitoring for traffic without degrading performance.

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Posted in how-to, security, surveillance, tcpip, tools | No Comments »

Web platform: uIP TCP/IP stack with SD card

Thursday, June 17th, 2010

The uIP TCP/IP stack for the web platform now lists and reads files from an SD card. You can now read files and list directories from the SD card. There's also a 'sddump' command that will dump sectors from the sd card in the same way that  memdump dumps memory,...

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Posted in tcpip, web platforms | 2 Comments »

Web platform: uIP TCP/IP stack with multitasking

Wednesday, June 2nd, 2010

There’s some new features in  Bonybrown's  uIP TCP/IP stack project for the web platform. Some notable changes are: The code runs 3 "tasks" that it multitasks between. One for the IP stack, one for the serial port (debugging help) and another for a handler for telnet (port 23). The telnet...

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Posted in tcpip, web platforms | 4 Comments »

Web platform: uIP TCP/IP stack port

Thursday, May 27th, 2010

Another update on the uIP TCP/IP stack port for the web platform. Bonybrown has added even more features: Periodic uIP processing now works, driven from RTCC alarm interrupt  (500mS). Added start for simple round-robin co-operative task switcher. Latest code is in the SVN. Previous updates here.

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Posted in tcpip, web platforms | No Comments »

Web platform: uIP TCP/IP stack with interrupts, DMA

Wednesday, May 12th, 2010

Here's another update on the uIP TCP/IP stack port for the web platform. Bonybrown got the uIP stack to work with interrupts from the ENC28J60, and used DMA to transfer buffers to PIC memory. Performance wise - no real difference I can see from the ping times; theoretically, the biggest...

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Posted in tcpip, web platforms | 1 Comment »

Web platform: uIP TCP/IP stack working

Monday, May 3rd, 2010

A few months ago we started a port of the uIP TCP/IP stack for the dsPIC33-based web platform. Bonybrown picked up the source and got it working. The current version can accept 10 simultaneous telnet connections, and has ping times of 0.68ms: Next steps I'd like to try are to...

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Posted in tcpip, web platforms | No Comments »

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