[ColorForth] reinventing the internet?

[Dirk Harms-Merbitz <dirk@xxxxxxxxx>]

Routers have information that hosts do not have.

Packets are dropped intentionally by routers in order
to signal congestion back to the sending host.

This makes UDP unreliable outside of LANs.

TCP responds to dropped packets by reducing the hosts
rate of sending packets. The dropped packet is resent.

Using TCP allows multiple independent hosts to coordinate
their behavior over very long distances.

It does not matter wether a host cooperates voluntarily.
RED managed queues will randomly drop packets when certain
thresholds are reached. The result is that a misbehaving
host has a higher chance of having his packets dropped.


On Wed, Dec 05, 2001 at 11:26:19AM -0800, Jeff Fox wrote:
> Dirk Harms-Merbitz wrote:
> > 
> > IPv6 is simpler then IPv4. It has extension headers.
> 
> I don't understand why UDP can't be used functionally
> for most things that use TCP/IP.  Why is the
> sorting of scrambled packets and complex recovery
> and timeout mechanisms so important everywhere?
> I want to know more.
> 
> I have never focused on the details and don't
> really understand that problem.  I know a little
> about it and have questions.  Can you help me
> understand not why it is complex, but why
> that complexity is required in most internet
> apps but not others.
> 
> If UDP works so well on video for instance, why
> is the more complex protocol required so often
> for things that seem less demanding to me?
> Just because it is a standard that is being
> used on the other end?  There must be some
> valid technical reasons why the simpler one
> isn't used more.  Can you try to educate us
> about that?
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