Sorry for the confusion
External DNS Server would have a DNS record that specifies the external SS Ip address for the external users.
Internal DNS server would have a DNS record that specifies the internal CS IP addresses for the internal users.
Sorry for the confusion
External DNS Server would have a DNS record that specifies the external SS Ip address for the external users.
Internal DNS server would have a DNS record that specifies the internal CS IP addresses for the internal users.