From: swjhes@mgtlimited.com
Date: Wed May 23 2001 - 14:30:42 EEST
Comments follow:
> One way of doing it is to use ipchains/iptables to log (but not drop)
> packets, but this will only tell you a packet got there at this time,
> not that a specific packet arrived.
[Hast, Chuck] I need to know the specific packet.
> Unless you like hacking kernels, pinging is not the answer. I'd setup
> some sort of UDP client/server with the payload being some encoded time
> so you know when the packet is sent. You could even stamp the replies
> with the remote ends clock.
[Hast, Chuck] I guess this will have to be the way, it is sort of
the way it
is being done right now there is just a lot of latency (it is being
done on
WinNT) and ping reflects more faithfully the real latency.
> Getting the clocks right is critical with that sort of thing for obvious
> reasons.
[Hast, Chuck] I synch with GPS
> I'd also look at NTP. A side-effect of what it does is it works out the
> delay between hosts. It does lots of funky stuff to do it.
>
> Of course you can always cheat and use RTT/2 but that assumes symmetric
> delays.
[Hast, Chuck] Over RF, symmetric they ain't.... B-[
> - Craig
>
> --
> Craig Small VK2XLZ GnuPG:1C1B D893 1418 2AF4 45EE 95CB C76C E5AC 12CA
> DFA5
> Eye-Net Consulting http://www.eye-net.com.au/
> <nvnnejj@wplus.net>
> MIEEE <cuvhm@unimc.it> Debian developer
> <roijsg.pnqpgo@cas.lt>
> -
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>
>
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