Hello Marc and others,   
      
   Hope you and others don't mind me butting in here.  I would not claim   
   to be particularly knowledgeable about IREX, but as I work in the   
   networking area I would make a few comments about the IPv4   
   'exhaustion' situation. There are three things that stand in the way   
   of actual exhaustion of IPv4 space.   
      
   1/ RFC1918 address ranges (10.0.0.0 - 10.255.255.255, etc.)   
   2/ Network Address Translation (NAT)   
   3/ Difference between 'allocated' and 'really not available anymore'   
      
   Most businesses don't use real IP's internally anymore, only RFC1918   
   ranges, and those who don't, could for the most part use RFC1918   
   addresses if they wanted to, or make their allocation irrelevant by   
   using NAT.  A new corporate customer will typically ask for only a   
   small block of IP addresses, not the thousands that were requested in   
   days gone by.   
      
   There are also lots of IP's that are nominally allocated, but   
   although once used, are in fact unused, and could be reclaimed if   
   necessary.  This has already happened in the case of a few A-class   
   ranges, including some used for Australian cable internet providers.   
   I personally know of a good half dozen class B's that could be   
   reclaimed given the will and effort, and there are probably more out   
   there, allocated but not routed on the Internet, or routed but of   
   which only a few are actually in use, and the rest are behind a NATing   
   firewall.  The ones I am referring to are mostly allocated to   
   Australian public universities and the like - orgs that got in early   
   on the Internet and were allocated lots of addresses they don't really   
   need.   
      
   Theoretically, Australian ISP's ran out of IPv4 address space in the   
   late 90's when APNIC exhausted its allocation.  So in the terms of 5%   
   of addresses being still available, Australia has 0%, but somehow, new   
   addresses are still available from my ISP if I ask for one :)   
      
   And finally, even if all of these factors were somehow overcome and   
   address space were exhausted anyway and people began to take up IPv6,   
   eventually to the exclusion of v4, IPv6 can be made to run an IPv4   
   tunnel, so the solution to run IREX and the like is just to build a v4   
   over v6 tunnel and use that.   
      
   Much the same principle as allows me to run DOS software under Linux   
   :)   
      
   Now that I have weighed into this debate, would there be any pointers   
   that I could follow on fixing my internal error 11 with IREX? :)  I   
   don't really want to dig through hundreds of pages of truss output,   
   which would seem to be my only other option, besides random trial and   
   error.   
      
      
   Regards,   
      
   Simon.   
      
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