Internet Protocol (IP) multicast is a bandwidth-conserving technology that reduces traffic by delivering a single stream of information to thousands of recipients and homes simultaneously. IP Multicast delivers source traffic to multiple receivers without any additional burden on the source or the receivers.
Applications that do video conferencing, corporate communications, distance learning, software distribution, stock quotes, and news use IP multicasting.
Sophos Firewall acts as a Multicast Forwarder for static multicast routes. In multicast forwarding, a router forwards multicast traffic to networks where other multicast devices are listening. You can configure Sophos Firewall to forward multicast traffic. This configuration is required when traffic from a single source is routed to multiple receivers.
The following sections are covered:
Applies to the following Sophos products and versions Sophos Firewall
A node in the LAN Zone behind Sophos Firewall is part of a Multicast Group assigned IP Address (126.96.36.199). It receives multicast traffic from external media streaming server at 188.8.131.52. The Sophos Firewall is configured to forward multicast traffic from external media server to the node listening for the multicast traffic as shown below:
Administrators can configure Multicast Forwarding by following the steps below:
Source IPv4 Address
Enter the Source IPv4 Address.
Select the Source Interface from the list.
Multicast IPv4 Address
Enter the Multicast IP Address whose traffic is to be forwarded.
<Interface through which External Server Traffic is to pass>
Select the Destination Interface(s) from the list.
The steps above configure multicast routing in the Sophos Firewall using the Web Admin Console.
You can configure Multicast Routing in your SF Device from the CLI by following the steps below:
mroute add input-interface <input/source interface> source-ip <source ip address> dest-ip <destination multicast ipaddress> out-interface <output/destination interface>
The steps above configure Multicast Routing in the Sophos Firewall using the Command Line Interface.
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