>is it possibile to have a dual firewall setup with carp using (temporarly) >2 different versions of OpenBSD? I've to setup some new firewalls and >upgrade old one and I'd like to keep redudancy while upgrading but during >the process some firewalls will run the 5.0, some still the old version.
carp and pfsync compatibility between releases is poor. There is some effort put into allowing an advance from one release to another, but anything further is probably going to fail. But there are also efforts to improve carp and pfsync, so...
