TAILIEUCHUNG - Raw Sockets

Raw Sockets let you program at just above the network (IP) layer You could program at the IP level using the IP API but you can’t get at ICMP Raw Sockets expose ICMP you get a Raw Packet and populate the entire packet yourself for high level protocols like TCP and UDP you lose all of the functionality implemented in those layers choosing to use a Raw Socket must be weighed carefully Raw Sockets can be dangerous Raw Sockets can be against the law . | Raw Sockets CS-480b Dick Steflik Raw Sockets * Raw Sockets Raw Sockets let you program at just above the network (IP) layer You could program at the IP level using the IP API but you can’t get at ICMP Raw Sockets expose ICMP you get a Raw Packet and populate the entire packet yourself for high level protocols like TCP and UDP you lose all of the functionality implemented in those layers choosing to use a Raw Socket must be weighed carefully Raw Sockets can be dangerous Raw Sockets can be against the law * Limitations Loss of Reliability No ports Non Standard Communications No automatic ICMP No Raw TCP or UDP Must have root (or administrator) privilege * When to use When you need to control the IP header applications like Ping and Traceroute not all fields can be set using the IP APIs Network Address Translation Firewalls When your application requires optimum network speed one level above the Link Layer if you need reliability, you must

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