Re: sockets: bind to external interface

References	<k4vg88-0tt.ln1@svn.schaathun.net> <mailman.815.1303760950.9059.python-list@python.org> <ra1h88-e0u.ln1@svn.schaathun.net>
Date	2011-04-26 06:30 +1000
Subject	Re: sockets: bind to external interface
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.816.1303763462.9059.python-list@python.org> (permalink)

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On Tue, Apr 26, 2011 at 6:14 AM, Hans Georg Schaathun <hg@schaathun.net> wrote:
> :  The way you talk of "the" external interface, I'm assuming this
> :  computer has only one. Is there a reason for not simply binding to
> :  INADDR_ANY aka 0.0.0.0?
>
> Ah.  That's what I really wanted.  Thanks a lot.  I wonder why that
> was not mentioned in the tutorial I used ...

If you don't care what port you use, you don't need to bind at all.
That may be why it's not mentioned - the classic TCP socket server
involves bind/listen/accept, and the classic TCP client has just
connect; bind/connect is a lot less common.

Incidentally, interfaces don't have to correspond 1:1 to network
cards. At work, we have a system of four IP addresses for each server,
even though it has only one NIC - it's used for traffic management and
routing. Binding to a specific address is sometimes important there.

Chris Angelico

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sockets: bind to external interface Hans Georg Schaathun <hg@schaathun.net> - 2011-04-25 20:37 +0100
  Re: sockets: bind to external interface Chris Angelico <rosuav@gmail.com> - 2011-04-26 05:49 +1000
    Re: sockets: bind to external interface Jean-Paul Calderone <calderone.jeanpaul@gmail.com> - 2011-04-25 13:13 -0700
    Re: sockets: bind to external interface Hans Georg Schaathun <hg@schaathun.net> - 2011-04-25 21:14 +0100
      Re: sockets: bind to external interface Hans Georg Schaathun <hg@schaathun.net> - 2011-04-25 21:24 +0100
        Re: sockets: bind to external interface Chris Angelico <rosuav@gmail.com> - 2011-04-26 07:21 +1000
      Re: sockets: bind to external interface Chris Angelico <rosuav@gmail.com> - 2011-04-26 06:30 +1000
        Re: sockets: bind to external interface Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-25 23:18 +0200
          Re: sockets: bind to external interface Chris Angelico <rosuav@gmail.com> - 2011-04-26 07:50 +1000
          Re: sockets: bind to external interface Hans Georg Schaathun <hg@schaathun.net> - 2011-04-26 06:20 +0100
      Re: sockets: bind to external interface Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-25 23:14 +0200
  Re: sockets: bind to external interface Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-04-26 11:24 +0200

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