d37d878f   
   From: none@none.invalid   
      
   On Tue, 18 Oct 2011 12:13:36 -0700 (PDT), David Schwartz   
    wrote:   
      
   >On Oct 18, 7:44 am, Bluz  wrote:   
   >   
   >> I don't use that values on my network, I was just wondering what would   
   happen with these values. That configuration should be useful when you want to   
   be able to access a machine but don't want to allow that same machine to reach   
   yours though.   
   >   
   >I hear that "requirement" a lot, and it sounds incoherent to me. If a   
   >machine can't reach you, you can't even open a TCP connection to it.   
      
   An exception, sort of, might be the case of a NAT router, where   
   systems being NAT'ed can establish a two-way connection to external   
   systems, but external systems can't establish a connection to the   
   NAT'ed systems.   
      
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