we have firewall ASAs in our environment running with ASA firmware version 8.4, and we are palnning to migrate to 9.x version considering it has less vlunerbilities and Bugs free.
Is there any Major changes ? like migrating from 8.2 to 8.3.
Is there any precautions/recommendations that we need to take into account for AnyConnect and S-2-S VPNs ?
please also suggest for the Minimum Hardware requirements.
I recently upgraded couple of 5505s from 8.4->9.x during some testing purpose and did not notice any major changes. Couple things (did not not impact any of my testing though)...
1. It adds some udp/tcp deny rules in the beginning of configuration.
2. Ip v4 and v6 terms, you can specifically use (instead of 'ip')
As every environment is different, I suggest you check the release notes. Hardware- same memory as 8.4.