how many bits of entropy do we need for load balancing?

Jay Hennigan jay at
Tue Dec 15 23:51:15 UTC 2020

On 12/14/20 16:25, nanog at wrote:

> There are 3 kind of hashing algorithm

Four if you count the trails followed by runners drinking beer.
See on-on for instance.

> The first one is used to check the sanity of input, against bit-swapping 
> error for instance
> See CRC for instance
> The second one is used for cryptographic purposes
> While the output distribution is supposed to be quite good, its most 
> important aspect lies here: it is hard to craft an input matching a 
> specific hash
> See sha256 for instance
> The last one combines both speed and output distribution
> See xxhash for instance

Jay Hennigan - jay at
Network Engineering - CCIE #7880
503 897-8550 - WB6RDV

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