RE: [Hash function Ipv4]

2012-06-04 Thread enrico d'urso
Hi, I did some tests with some subnets Ip /24 and I will share the results. I got very good results with this configuration: Hash table's size: Let x be the number of ip. Y = x*2, then size_table = 'The power of 2 closest to Y, and greater than or equal to Y'. Hash Function: return Ip_in_

Re: [Hash function Ipv4]

2012-06-03 Thread Gleb Kurtsou
On (02/06/2012 20:14), enrico d'urso wrote: > > Hi, > I'm looking for an Hash function for Ipv4 addresses. > > What are good ones? Have you tried good general purpose hash functions like murmur3 or cityhash? Another option is to use "hash" function that is bijection on integers and exploit this

Re: [Hash function Ipv4]

2012-06-02 Thread Poul-Henning Kamp
In message , enrico d'urso writes: > >I'm looking for an Hash function for Ipv4 addresses. > >What are good ones? They are generally very hard to hash well, for all sorts of reasons related to how we use them. One way that used to work reasonably well for me: uint32_t ipv4, h;