Use of Bind , Connect with IP Multicasting

Question

i'm trying to get a clear picture of the semantics of using bind, connect with IP multicasting.
ipv4 & ipv6 both are relavent.
it is my understanding -- you must multicast join on each interface you want to receive on.
in my view of the world, ideal semantics would provide :
bind-ing a socket to a specific local IP address, port - that has joined multiple IP multicast addresses
on multiple interfaces would allow multicasts to still be received - but would limit them to
interfaces which matched the bound IP address, and further if more than 1 interface supported
the same IP address, would allow receipt for all the joined interfaces that match the bound
IP address.
this does not appear to be the case; it appears that binding to a local IP address causes
multicast receipt to terminate. binding to 1 of the joined multicast address limits receipt
to the bound multicast address. the semantics seem confusing.
regarding connect :,
imagine multiple sources of a specific IP multicast address; your socket is doing receiving only,
no transmiting. it seems that ideally connect would allow you to limit the receipt of IP multicast
to the source that you connect to; i imagine connecting to the foreign IP address,
not the IP multicast address being transmitted. if semantically i could connect to the IP multicast address
i would still be receiving from all the sources - so no filtering benefit.
my understanding is you can connect to a IP multicast address; but this seems redundant to bind with
the only advandage that you can use send instead of sendto. and further if multiple sources are
transmitting the same IP multicast address you dont get filtering
when i tried using multiple sources transmitting 2048 different IP multicast address, with a receiver
who had multicast joined the same 2048 IP multicast address -- as soon as connect to 1 of the
sources ( foreign IP address) of the IP multicasts i stop receving packets all together. i had hoped
to limit the receipt of the multicasts to just that single source.

Answer 1

Generally, you would use bind variables by changing statements that are written like this
select * from emp where empno=6678 and ename='Jones'
so that they're written like
select * from emp where empno=? and ename=?
How you then bind these question marks to the particular values you want depends on the API you're using (ADO? OLE DB directly?, etc). If you have a support contract, there are plenty of examples for any API on metalink.oracle.com
Justin