We know: in flat network (simple hub-switch) every packet is send to all 
ETH ports. So multicast packets could be received without subscription. 
Does libuv operate with them?
How can I know target address of UDP packet if it is multicast?

typedef void (*uv_udp_recv_cb)(uv_udp_t* handle, 
ssize_t nread, 
const uv_buf_t* buf, 
const struct sockaddr* addr, 
unsigned flags);

What is target address? On what interface libuv received packet? 
This question are actual for multicast packets; for host with multiple 
network interfaces.

Thank you for attention.

----
With best regards
Ivan Kuvaldin 
[email protected]

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