[Standards] binding to tcp for s2s communication

Max Indelicato MIndelicato at g8wave.com
Fri Mar 7 19:33:45 UTC 2008

Perfect, that's what I was hoping. I guess I thought that since it
wasn't specified, that there might have been further clarification in
another document.

Thanks for the help!

-----Original Message-----
From: standards-bounces at xmpp.org [mailto:standards-bounces at xmpp.org] On
Behalf Of Dave Cridland
Sent: Friday, March 07, 2008 1:12 PM
To: XMPP Extension Discussion List
Subject: Re: [Standards] binding to tcp for s2s communication

On Fri Mar  7 18:07:10 2008, Max Indelicato wrote:
> So my question is this, what is the proper implementation of this
> standard, taking into consideration that you can't bind a socket in  
> any
> language that I'm aware of, to a port that has already been bound by
> another socket? For example, if I locally bind SERVER1's outbound  
> socket to 5269 and make a connection to  SERVER2's inbound TCP  
> socket on
> 5269, then I'm ok. But when SERVER2, tries to then locally bind its
> separate outbound socket to 5269, in an attempt to connect to  
> inbound socket, it can't because the outbound socket is already  
> bound to
> that port. This is a problem on both ends really - simply put, you  
> can't
> bind two separate TCP sockets to the same port (inbound and outbound
> being those two separate sockets).

Indeed... But you don't need to use 5269 for outgoing connections -  
it's only used as the destination port. Your source port can be  
anything, and is usually left "unbound" - as in, you let the OS do  
the binding.

Otherwise no, you wouldn't be able to have two TCP connections both  
with source and destination ports being 5269.

Dave Cridland - mailto:dave at cridland.net - xmpp:dwd at jabber.org
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