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1 26th July 02:52
External User
Posts: 1
Default UDP Socket - IP_MULTICAST_IF option

Hi !

I'd like to know why the IP_MULTICAST_IF option is needed when we have to
send data to a multicast group.

Because, if I understand, this option is for selecting the local ip address
used to send the data. But we can also bind the socket with a local ip, so
what is the difference ?

Another thing, when we use this option we can also send data to other
So I'd like to know if I forget something or if I don't understand ...

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2 26th July 02:53
phil frisbie jr
External User
Posts: 1
Default UDP Socket - IP_MULTICAST_IF option

It is not needed for most applications.

By default multicast is only sent out the default NIC, or address, so the
IP_MULTICAST_IF option allows you to over-ride which NIC is used.

Phil Frisbie, Jr.
Hawk Software
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