Web lists-archives.com

Re: Free TCP/IP port numbers?




On Mon, Oct 02, 2017 at 10:19:42AM -0000, Dan Purgert wrote:
Trouble with ports <1024 is that the process trying to use them will
need root permissions to bind to the port.  This may cause its own
fallout rather than using something in the upper range.

And the advantage of such a port is that a user can't grab a port that you want to use the system. (An event which can cause its own fallout, as well as potentially being a security problem.) Luckily systemd makes it much easier to reserve a port early in the boot process so that's not as much of a problem as it used to be.

Mike Stone