If an application does not care what local address is assigned, specify the manifest constant value ADDR_ANY for the sa_data member of the name parameter. This allows the underlying service provider to use any appropriate network address, potentially simplifying application programming in the presence of multihomed hosts (that is, hosts that have more than one network interface and address).
抄自MSDN,按这样说,是不是意味着我们用ADDR_ANY的时候就不会去关心到底bind了哪一块网卡,如果你比较关心这一点,不如直接去bind某一块,而不会使用ADDR_ANY.