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About time-to-live values

A multicast stream is distributed over a specific number of routers in a network, which is determined by the time-to-live (TTL) value. The time-to-live value decreases every time the content passes through a router. When the value reaches zero, the multicast stream travels no further. The WMS Multicast Data Writer plug-in has the following preset time-to-live values based on the type of distribution:

You may also specify any whole number between 1 and 255 to meet the needs of your multicast.

If you use an IPv6 multicast address, the time-to-live value is included in the first field of the address. For example, the first field in the address FF01:0000:0000:0000:0000:0000:0000:0000 is FF01, which indicates the address is locally scoped, meaning that the content is restricted to the local computer and the time-to-live value is set to 1. The following list shows the standard first field values and their corresponding scopes:

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