Configure AWS Firewall Manager for the organization. Create an AWS Network Firewall policy that allows only source traffic from the company ' s IP address range Set the policy scope to all accounts in the organization.

In Organizations, create an SCP that denies source IP addresses that are outside of the company s IP address range. Attach the SCP to the organization ' s root

Configure Amazon GuardDuty for the organization. Create a GuardDuty trusted IP address list for the company ' s IP range Activate the trusted IP list for the organization.

In Organizations, create an SCP that allows source IP addresses that are inside of the company s IP address range. Attach the SCP to the organization ' s root.