A SYN attack -Computer resources page-3

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Computers

A SYN attack simply buries its target by swamping it with TCP SYN packets. Each SYN packet demands a SYN-ACK response and causes the server to wait for the proper ACK in reply. Of course, the attacker never gives the ACK, or, more commonly, it uses a bad IP address so there's no chance of an ACK returning. This quickly hogties a server as it tries to send out SYN-ACKs while waiting for ACKs.

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When the SYN-ACK queues fill up, the server can no longer take any incoming SYNs, and that's the end of that server until the attack is cleared up. The Land attack makes SYN one-step nastier by using SYN packets with spoofed IP addresses from your own network.There are many ways to reduce your chances of getting SYNed, including setting your firewall to block all incoming packets from bad external IP addresses like 10.0.0.0 to 10.255.255.255, 127.0.0.0 to 127.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255, as well as all internal addresses. But, as SCO discovered, if you throw enough SYN packets at a site, any site can still be SYNed off the net