But we will not concern ourselves with ATM in this book. Not so with the AF_ATM address family, as SOCK_RAW is the only socket type to use with the AF_ATM address family. For one thing, there are restrictions on the use of raw sockets in the AF_INET address family. Fortunately for network developers, Microsoft supports this socket type for both address families, but there is a sting in the tail. That is, it is an optional feature in the Winsock hierarchy that not all vendors support. Unlike other socket types, such as SOCK_STREAM and SOCK_DGRAM, support for SOCK_RAW is purely optional in the AF_INET address family. Raw sockets are based on the SOCK_RAW socket type in the AF_INET and AF_ATM address families. In this short section, we will expose raw sockets.
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