These are all owned (/22,/23,/24,/26) network blocks and a pair of Cisco routers are going BGP in front of the HA Pix.
The end result is to replace the aging HA Pix with a pair of CARP pfsense and migrate the Pix rules into pfsense.
I know how to setup CARP and pretty much everything with the pfsense…except question is how to convert some of the NAT rules.
I have already started on a lot of the aliases and rules, because of the number of networks and ip addresses involved, setting up single 1-1 rules is not ideal, hence the question about entire network block 1-1 NAT.