TCP\UDP DOS attacks - Chapter 7: TCP & UDP based DoS...

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Zouheir Trabelsi Chapter 7: TCP & UDP based DoS Attacks
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Zouheir Trabelsi 2 The Internet Layers and Protocols http ftp telnet SMTP Applications Layer TCP UDP Transport Layer IP Network Layer Physical Interface Data Link Layer & Physical Layer ICMP DNS
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Zouheir Trabelsi 3 UDP Header
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Zouheir Trabelsi 4 UDP Flooding Attack NetScreen SSG 20 DoS attack
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Zouheir Trabelsi 5 DNS server of UAE University: UDP Flooding Attack DNS server of UAE University
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Zouheir Trabelsi 6 TCP Protocol
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Zouheir Trabelsi 7 How to identify an application or process IP Physical Layer TCP - UDP FTP client Web client FTP server Web server IP TCP - UDP 1056 1067 21 80 Host A (IP_A) Host B (IP_B) 1050
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Zouheir Trabelsi 8 Standard TCP Ports Port number Description 20 FTP-DATA File Transfer [Default Data] 21 FTP File Transfer [Control] 23 TELNET Telnet 25 SMTP Simple Mail Transfer 37 TIME Time 42 NAMESERVER Host Name Server 43 NICNAME Who Is 53 DOMAIN Domain Name Server 79 FINGER Finger 80 HTTP WWW 110 POP3 Post Office Protocol - Version 3 111 SUNRPC SUN Remote Procedure Call
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Zouheir Trabelsi 9 TCP Header TCP packets used for: Establish a connexion Data transfer Acknowledgement Terminate a connexion Source port Destination port Sequence number Acknowledge number HLEN Reserved Codes Window Checksum Urgent pointer TCP Options (if any) padding Data 0 4 10 16 24 31 N * 32bits TCP header IP Header TCP Header Application header Segment TCP 20 bytes minimum Data
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Zouheir Trabelsi 10
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Zouheir Trabelsi 11
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Zouheir Trabelsi 12 Opening of a TCP connexion: Three-way handshake TCP source TCP destination SYN, seq=x SYN, seq=y, ACK, ack=x+1 Ack, y+1 TCP Connexion establishment : From now the connexion is established Half open connexion
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Zouheir Trabelsi 13 TCP source TCP destination SYN=1 ACK = 0 SYN=1 ACK = 1 SYN = 0 ACK = 1 ACK = 1 SYN = 0
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This note was uploaded on 03/26/2010 for the course SECB 455 taught by Professor Zuhairtrabelsi during the Spring '10 term at United Arab Emirates University.

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TCP\UDP DOS attacks - Chapter 7: TCP & UDP based DoS...

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