On Sat, 20 Oct 2007, Peter Jeremy wrote: PJ>On Wed, Oct 17, 2007 at 08:51:34PM -0700, Len Gross wrote: PJ>>I'm doing some protocol development and it is convenient to start it on PJ>>Ethernet. I will need to send a packet to the Ethernet device and only have PJ>>it be sent once, even if there is a colision. PJ> PJ>I know we've still got some hubs lying around in a backroom at work PJ>but I don't know of anything that will let you disable the retry-on-CD. PJ> PJ>Have you considered simulating the network at a slightly higher lever: PJ>Use ipfw pipes or similar to simulate packet loss (either set a queue PJ>length of 1 or probabilistically). This could be done either as a PJ>bridge or by tunneling your protocol over IP or UDP.
Some years ago I wrote a netgraph node that connected to ethernet nodes and simulated a wireless broadcast channel including collisions, timevariable delay, loss and shaping. Can be done in a couple of hundreds of lines and easily allows >100MBit/sec with gigabit ethernet. The ethernet is just the physical transport medium for the packets and does not take part in the emulation. All that was controlled by bsnmpd and a remote command line tool and/or Java-GUI. Unfortunately I cannot release this (yet) due to licensing... harti _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
