DNS by port number...

KR konrad.roeder at gmail.com
Sun Apr 9 19:25:13 PDT 2017

I don't get what the additional IP addresses buy you.  Why do you want to
waste IP addresses?

The UDP and TCP ports are in the same machine, but in layer 4-7 ...
different transport and applications.

http:// should translate to port 80
ftp:// should translate to port 21
ssh:// should translate to port 22
telnet:// should translate to port 23

--Konrad, WA4OSH

On Sun, Apr 9, 2017 at 1:12 PM, Bill Vodall <wa7nwp at gmail.com> wrote:

> Another great idea of mine - that somebody has probably thought of
> before.  But does anybody here know if and where it's been thought of
> before?
> We all know DNS A records - give a name and get an IP address back.
> For years (really!) I've wondered how that magic extends to give a
> name and get both an ID address - and - a port number back.  Thanks to
> (Happy BDay) John H and his Ham DNS presentation at uHams - I now know
> about SRV and LOC DNS records.  Awesome cool stuff.
> Butt....   (there's always one ain't there....)
> I want to take it a step further.   I want to vary the IP address
> returned from a DNS query dependent on the port number I give it.
> For example:
>   www.findewe.ham -> returns IP
>   findewe.ham -> returns IP
>   findewe.ham:14580 -> returns aprs.findewe.ham == IP
>   findewe.ham:443 -> returns linlink.findewe.ham == IP
> Has anybody heard of some such magic?
> Thanks and 73,
> Bill - WA7NWP
> PS.  Sure - 14580.findewe.ham could be mapped to IP - but
> that's not as cool as having one
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Konrad Roeder
425-444-0595 Cell
425-256-2144 Home
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