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dgram_socket.setMulticastTTL()

socket.setMulticastTTL(ttl)

ttl <Number> Integer

Sets the IP_MULTICAST_TTL socket option. While TTL generally stands for "Time to Live", in this context it specifies the number of IP hops that a packet is allowed to travel through, specifically for multicast traffic. Each router or gateway that forwards a packet decrements the TTL. If the TTL is decremented to 0 by a router, it will not be forwarded.

The argument passed to to socket.setMulticastTTL() is a number of hops between 0 and 255. The default on most systems is 1 but can vary.

Links:

https://nodejs.org/dist/latest-v5.x/docs/api/dgram.html#dgram_socket_setmulticastttl_ttl

doc_Nodejs

2016-04-30 04:38:43

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