Re: Lost UDP packets
Re: Lost UDP packets
- Subject: Re: Lost UDP packets
- From: Justin Walker <email@hidden>
- Date: Fri, 24 Sep 2004 15:28:43 -0700
On Sep 24, 2004, at 15:04, Peter Lovell wrote:
Hi
I have a strange problem with lost broadcast UDP packets.
[snip]
Lost packets are often victims of collision, and collision depends upon
physical layout on the network. So it's not at all surprising, on some
network setups, that one machine would have a packet corrupted by a
collision while another machine would get the two in sequence.
Remember that light travels a foot per nanosecond (in rough terms).
Signals on a network are somewhat slower. At Gigabit speeds, packet
length on the wire starts to become "interesting", and different
machines
will see different results.
Not to contradict Peter's analysis :-}, but collisions, while
theoretically possible, are not probable on today's networks (which use
full-duplex schemes, and are "point-to-point" between hub/switch and
system). It's possible that you can get the effect of a collision by
overrunning the hub/switch, but in most recent Ethernet setups, the
hub/switch and system have a sort of RTS/CTS handshake to minimize
this.
Cheers,
Justin
--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | If you're not confused,
| You're not paying attention
*--------------------------------------*-------------------------------*
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