> I am looking for a tool that is able to measure the (one-way) > latency or delay. > >From what i know ping or traceroute are only able to measure the RTT.
There is no widely-used, standard tool that I know of. Im sure there is some code you could snarf from somewhere, though. I think the reason that a standard tool doesnt exist is that the problem of latency testing essentially degenerates to one of clock synchronization between the source and the destination. If you do RTT measurements, the transmitter and receiver are the same box, so the clocks are automatically synchronized. If you do one-way testing, you need to get clock synchronization between the source and dest nodes. If you need highly accurate measurements, then you might need something like GPS to help you synchronize (as opposed to NTP, which is great for basic date/time stuff, but wont help you much with microsecond resolution timing). Once you have the clock synchronization issue nailed, the code to do the measurement is only about half a page of C on both the source and test: take a timestamp, transmit a UDP packet out, receive it sometime later, and take another timestamp. -- Dave _______________________________________________ Vyatta-users mailing list Vyatta-users@mailman.vyatta.com http://mailman.vyatta.com/mailman/listinfo/vyatta-users
