I have seen the IPv4 hash function: (ip ^ (ip >> 23) ^ (ip >> 17)) & ~(bucketsize - 1) for power-of-2 sized hash tables attributed to Van Jacobson, in many places, but I have never found any paper or writing that is the actual source of this. Does anyone know where I might find such? Personal curiosity only. -- Richard A Steenbergen <ras@above.net> http://users.quadrunner.com/humble PGP Key ID: 0x60AB0AD1 (E5 35 10 1D DE 7D 8C A7 09 1C 80 8B AF B9 77 BB) AboveNet Communications - AboveSecure Network Security Engineer, Vienna VA