thought that this might be of some interest also for the Ethereal community:
Today the RTnet project has released a new version which now allows capturing of Ethernet packets on a hard real-time Linux box (RTAI). This features increases the guaranteed precision of packet time stamps by several magnitudes, typical numbers are about 10-20 microseconds on a suitable x86 hardware.
The packets are received by a real-time enabled Ethernet driver in the RTOS context and then copied to a read-only shadow network devices in Linux context (note that the copy step is required to preserve real-time contraints). Also packets sent by the local RTnet stack are captured. The shadow device can then be addressed by any standard capturing tool like Ethereal, tcpdump, etc.
RTnet is a hard real-time Ethernet stack based on Linux/RTAI. It is released as Open Source under GPL terms. A RTnet protocol plugin is part of Ethereal since last year (BTW, Erwin's latest patch is still not applied... ;)). See http://www.rts.uni-hannover.de/rtnet for further information.
Greetings, Jan
- RTnet project manager -
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