f2568

 
 

IPFlowPortHash() - selecting ephemeral ports for reverse NAT

June 23, 2026

development, projects

BalanceNG, algorithms, Tabulation Hashing, f2568, C

If you are interested and somewhat into C - here’s a closer look: This is the IPFlowPortHash() function in place with BNG RNAT. It ret urns a port within the ephemeral port range 49152-65535 (RFC 6335 and IANA).

f2568() - A variable Length Tabulation Hash Function

June 1, 2025

development

algorithms, Tabulation Hashing, C, f2568

f2568() is a variable length tabulation hashing function which returns a 64 bit hash result of input data up to a size of 256 bytes. It’s fast (requiring as many XOR operations as the data length in bytes), easy to understand and very strong at the same time. f2568() is publicly available under the BSD-3-Clause License.