address pools

Allocation schemes:

source-hash: hashes the source ip address (with a key); the "redirection" IP address will always be the same for a given source.

bitmask: changes the network portion of the IP address, leaving the host portion the same.

random: selects the redirection address at random from the CIDR block.

round-robin: loops through the block of addresses (or list of addresses) sequentially.