From: invalid@invalidinvalid.org   
      
   On 2010-10-25 16:17, Lew Pitcher wrote:   
   > On October 25, 2010 09:35, in comp.protocols.tcp-ip,   
   > miguelsanders@telenet.be wrote:   
   >   
   >> Is there any way how a TCP/IP C programmer can have more control on   
   >> the source TCP port that will be used to setup the socket ?   
   >   
   > Use a bind(2) call ("man 2 bind") to connect your socket to a specific   
   > source port number.   
      
   Ok, normally the OS assigns randomly a free local port if one   
   doesn't bind the socket to a specific port.   
   But, for a special application I need to use raw sockets, ie.   
     s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);   
   Now, I would use a free random local port as the source port,   
   but don't know how to get one. Is there a method to get such   
   a port, and inform the OS (Linux) about the fact that   
   this port is going to be used, so to prevent a possible use   
   attempt of the same port by the normal socket functions?   
      
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   Uenal Mutlu, Hannover/Germany   
      
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