11 Sep
2014
11 Sep
'14
11:29 p.m.
On Thu, Sep 11, 2014 at 09:17:26PM +0000, Fons Adriaensen wrote:
Re. the format used by njbridge: for IPv4 the IP and
UDP
headers together take 28 bytes. That is less than 2 percent
of 1500, and is a small price for having packets that can be
handled by switches and routers. There is really no point in
trying to reduce that sort of overhead. The njbridge format
itself adds a 20 byte header to sample packets. This data is
used to identify the packet, to improve the timing and handle
skipped cycles, xruns, lost packets and the like. All together
the overhead is less than 3.5%.
But then you *must* take care of timing, since you have no idea if packets passed through
a router will arrive in order, how long they'll take to traverse it, or even if
they'll arrive unmangled at all.
If you are going to strip it down, just go with bare Ethernet frames :-)
--
Gordonjcp MM0YEQ