Xmind 3.5.112/28/2023 (For example, block traffic originating from the Internet with an internal source address.) 1.3.4 Implement anti-spoofing measures to detect and block forged source IP addresses from entering the network.1.3.3 Do not allow any direct connections inbound or outbound for traffic between the Internet and the cardholder data environment.1.3.2 Limit inbound Internet traffic to IP addresses within the DMZ.1.3.1 Implement a DMZ to limit inbound traffic to only system components that provide authorized publicly accessible services, protocols, and ports.1.3 Prohibit direct public access between the Internet and any system component in the cardholder data environment.1.2.3 Install perimeter firewalls between all wireless networks and the cardholder data environment, and configure these firewalls to deny or, if traffic is necessary for business purposes, permit only authorized traffic between the wireless environment a.1.2.2 Secure and synchronize router configuration files.1.2.1 Restrict inbound and outbound traffic to that which is necessary for the cardholder data environment, and specifically deny all other traffic.Note: An “untrusted network” is any network that is external to the networks belonging to the e 1.2 Build firewall and router configurations that restrict connections between untrusted networks and any system components in the cardholder data environment.1.1.7 Requirement to review firewall and router rule sets at least every six months.Examples of insecure services, protocols, or port 1.1.6 Documentation and business justification for use of all services, protocols, and ports allowed, including documentation of security features implemented for those protocols considered to be insecure.1.1.5 Description of groups, roles, and responsibilities for management of network components.1.1.4 Requirements for a firewall at each Internet connection and between any demilitarized zone (DMZ) and the internal network zone.1.1.3 Current diagram that shows all cardholder data flows across systems and networks.1.1.2 Current network diagram that identifies all connections between the cardholder data environment and other networks, including any wireless networks.1.1.1 A formal process for approving and testing all network connections and changes to the firewall and router configurations.1.1 Establish and implement firewall and router configuration standards that include the following:.Requirement 1: Install and maintain a firewall configuration to protect cardholder data.
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