announce nat pool to ospf

[Kapetanakis Giannis]

Hi,

I'm setting up a pair off redundant carp/pfsync firewalls/routers to 
perform as VLAN gateways.
The firewalls will announce the VLAN networks to OSPF and also will do 
NAT on traffic destinating to the internet.

I'm using a carp interface to announce the NAT pool to OSPF which works 
but I'm not feeling very sure about it.
I've also tried setting up a blackhole route but failover didn't work on 
carpdemote.

Would anyone suggest a better way to do this?

thanks,

Giannis