Re: network adapters, IP addresses, ports, domain names

[steve%prd.co.uk@localhost (Steve Blinkhorn)]

You wrote:
> 
> On Thu, Nov 16, 2023 at 03:48:49PM +0000, Steve Blinkhorn wrote:
> > In a situation where a NetBSD machine (9.2 amd64 if it matters) has
> > multiple network adapters each with multiple IP addresses
> > corresponding to diverse domain names, to what are port numbers
> > uniquely attached?
> > 
> 
> They're attached to IP addresses, either specific IP addresses or
> unspecified IP address (0.0.0.0 or ::).  If the server application
> binds to the unspecified IP address the port is not bindable to specific
> IP addresses by other servers.
> 

So can two different IP addresses on the same adapter each use the same
port number each for its own distinct purposes?  I would assume they
can since I run different web servers that use ports 80 and 443 in
this way.   (Obviously I have a debugging problem that's irking me,
but I think is not strictly a NetBSD issue - I'm just trying to
eliminate wilder possible sources).

Thanks for the swift response, BTW.

-- 
Steve Blinkhorn <steve%prd.co.uk@localhost>