[e2e] What if there were no well known numbers?

Saikat Guha saikat at cs.cornell.edu
Thu Aug 3 11:14:41 PDT 2006

On Thu, 2006-08-03 at 09:50 -0700, Christian Huitema wrote:
> > In other words, what if Microsoft loc-srv/epmap did not use tcp/135?
> > What if it just used any various potr at any time? 
> The end point mapper enables RPC based applications to run on variable
> ports, allocated when the application starts. So, it already enables the
> absence of "well known port numbers" for these applications. But to do
> that, you need a rendezvous service at some well known location...

In a private network, one can get around the "well known
location"/rendezvous bootstrapping limitation with some local broadcast
-- UPnP, Apple's rendezvous/Zeroconf, and even DHCP to some extent
perhaps. That further reduces the problem to that of fishing out well
known packet formats on the wire.

Across network boundaries, however, it starts looking more like Plutarch
with interstitial functions/middleboxes translating
configuration-requests on one side to that on the other side.

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