[Snort-users] Hash function for ip 4-tuple

Alex Adamos alexthakidadam at ...125...
Mon Feb 4 08:12:04 EST 2013


Thanks Andrei, i'll try that!How do you get the IP? in sfSnortPacket structure its a sfip_t type. Is it done with sfip_to_str and then something like strtol?

Date: Mon, 4 Feb 2013 16:19:24 +0400
From: andrei_1980 at ...1975...
To: alexthakidadam at ...125...
CC: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Hash function for ip 4-tuple


  
    
  
  
    I'm not professional in that. When i
      need quick solution, I tried
          the following method. 

      

      ( IP1*(2^16) + port1)  xor  ( IP2*(2^16) + port2 )

      

      It is a
          simple method, and
          does not guarantee that no
          conflicts.

      

      This worked for my needs. 

      

      

    
    
      
      
        Hi,
        

        
        in order to keep track of flows in my DPX i want to create
          a hash table, but i don't have
            any experience in hashing. Can anyone propose any idea how the hash function
            should be? 
        

          
        Thanks,
        Alex.
      
      

      
      

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