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MAC-Forced Forwarding (MACFF) is used to control unwanted broadcast traffic and host-to-host communication. This is achieved by directing network traffic from hosts located on the same subnet but at different locations to an upstream gateway device. This provides security at Layer 2 since no traffic is able to pass directly between the hosts. MACFF is suitable for Ethernet networks where a layer 2 bridging device, known as an Ethernet Access Node (EAN), connects Access Routers to their clients. MACFF is configured on the EANs.

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  • MAC-Forced Forwarding (en)
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  • MAC-Forced Forwarding (MACFF) is used to control unwanted broadcast traffic and host-to-host communication. This is achieved by directing network traffic from hosts located on the same subnet but at different locations to an upstream gateway device. This provides security at Layer 2 since no traffic is able to pass directly between the hosts. MACFF is suitable for Ethernet networks where a layer 2 bridging device, known as an Ethernet Access Node (EAN), connects Access Routers to their clients. MACFF is configured on the EANs. (en)
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  • MAC-Forced Forwarding (MACFF) is used to control unwanted broadcast traffic and host-to-host communication. This is achieved by directing network traffic from hosts located on the same subnet but at different locations to an upstream gateway device. This provides security at Layer 2 since no traffic is able to pass directly between the hosts. MACFF is suitable for Ethernet networks where a layer 2 bridging device, known as an Ethernet Access Node (EAN), connects Access Routers to their clients. MACFF is configured on the EANs. MACFF is described in RFC 4562, MAC-Forced Forwarding: A Method for Subscriber Separation on an Ethernet Access Network. Allied Telesis switches implement MACFF using DHCP snooping to maintain a database of the hosts that appear on each switch port. When a host tries to access the network through a switch port, DHCP snooping checks the host’s IP address against the database to ensure that the host is valid. MACFF then uses DHCP snooping to check whether the host has a gateway Access Router. If it does, MACFF uses a form of Proxy ARP to reply to any ARP requests, giving the router's MAC address. This forces the host to send all traffic to the router, even traffic destined to a host in the same subnet as the source. The router receives the traffic and makes forwarding decisions based on a set of forwarding rules, typically a QoS policy or a set of filters. (en)
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