From: ibuprofin@painkiller.example.tld.invalid   
      
   On Wed, 13 Jul 2016, in the Usenet newsgroup comp.protocols.tcp-ip, in article   
   , Alex Martin wrote:   
      
   >Running OS X, and when I connect to a local server via localhost, the   
   >'client address' is always 0.0.0.0.   
      
   Lack of info - where do you see the information?  Is this something in   
   the server logs, something displayed by the client, the server, or...   
      
   >I'm wondering if this is normal, OS X weirdness, or a bug?   
      
   Not enough info.  0.0.0.0 (and in fact the entire 0.x.x.x range) is   
   IP's version of saying "me, but I don't know my name or address".   
   From RFC6890 (Special-Purpose IP Address Registries):   
      
                 +----------------------+----------------------------+   
                 | Attribute            | Value                      |   
                 +----------------------+----------------------------+   
                 | Address Block        | 0.0.0.0/8                  |   
                 | Name                 | "This host on this network"|   
                 | RFC                  | [RFC1122], Section 3.2.1.3 |   
                 | Allocation Date      | September 1981             |   
                 | Termination Date     | N/A                        |   
                 | Source               | True                       |   
                 | Destination          | False                      |   
                 | Forwardable          | False                      |   
                 | Global               | False                      |   
                 | Reserved-by-Protocol | True                       |   
                 +----------------------+----------------------------+   
      
   and that's referring to RFC1122 (Requirements for Internet Hosts -   
   Communication Layers.).   OS X - you'd have better luck asking in an   
   OSX newsgroup (one of the comp.sys.mac.* most likely), but what's in   
   the /etc/hosts file?  On many UNIX like systems, you'd see something   
   like   
      
   [herschel ~]$ cat /etc/hosts   
   127.0.0.1       localhost   
   192.168.1.6     herschel.phx.az.us   
   ::1             localhost ip6-localhost ip6-loopback   
   [herschel ~]$   
      
   where this host is known on the LOCAL network as herschel.  Is that   
   first "localhost" line there?   
      
           Old guy   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)