Cisco - ASA ACL Using FQDN
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Below is the basic setup needed to use Cisco ASA ACL with FQDN. This feature was added in 8.3 -> on. This is one of the best features for the simple task of NTP pools.
dns domain-lookup inside
DNS server-group DefaultDNS
object network obj-hr88.cisco.com
access-list inside_in deny ip any object obj-hr88.cisco.com
access-list inside_in permit ip any any