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Re: Free TCP/IP port numbers?




On Saturday 30 September 2017 22:28:45 Alexander V. Makartsev wrote:

> Ok, I will not waste my time to argue over obvious things.
> You won't get ports more "default" than from this list. Protocols,
> ports and service names are registered for a reason.
> Ex: If you install MySQL server it will be configured to listen on
> port 3306\tcp by default on any OS, be it Debian, RHEL, or Windows.
>
Thats a bit of a stiff attitude.  If his network is an isolated private 
network, there isn't any port police going to come and rip it up or 
prosecute for reconfiguring that install to use any of the ports that 
aren't in the services list. In fact I'd recommend that none of them run 
as root on a day to day basis.

> On 01.10.2017 06:40, Victor Porton wrote:
> > Alexander V. Makartsev wrote:
> >> There is official list of all registered port numbers:
> >> https://www.iana.org/assignments/service-names-port-numbers/service
> >>-names-port-numbers.txt
> >>
> >> You can choose any port that is not in the list, to be sure they
> >> won't clash.
> >
> > The list of port numbers you pointed to me is a subset (or at least
> > not a superset) of the full list used by Debian packages.
> >
> > Assuring that my port is not in this IANA list is not enough to
> > ensure that my port number will not clash with a port number used by
> > a Debian package (by default).
> >
> > So your answer to my question is wrong.
> >
In which case debian should publish the unlisted ports they do use, if 
for no other reason than to "stake a claim".

> >> On 01.10.2017 06:04, Victor Porton wrote:
> >>> We are going to install a range of software on a Debian Linux
> >>> installation. Because we run the same software (such as Celery)
> >>> several times, we need to use port numbers different than the
> >>> standard Debian port numbers chosen by default (because we can't
> >>> run more than one instance of a server with the same port, and
> >>> thus using the standard port number for all servers would fail).
> >>>
> >>> How to choose TCP/IP port numbers for server software we run in
> >>> such a way that they don't clash with "standard" Debian port
> >>> numbers?
> >>>
> >>> In Debian are there any ranges of port numbers dedicated (so that
> >>> they wouldn't clash with "standard" that is used by default port
> >>> numbers) for servers configured by users?
> >>>
> >>> Note that we run (at least some of) our software not as root, so
> >>> we can't use ports below 1024.


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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