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indication that there is an attack taking place. Alternatively, host A simply might not respond to the Are you sure message at all. If host A does not respond to the Are you sure message, then host M could send a second spoofed packet sometime later with the answer Yes. Since the source IP address would be A s address, host B would allow the command because host A s address is on its whitelist, and host B would proceed to delete all files on its hard disk. So it is actually quite critical that host M makes sure that host A does not respond to the Are you sure message. To ensure that host A does not respond, host M can start a DoS attack against host A prior to sending its delete all files message to host B. Hence, even though host B sends an Are you sure message back to the source address to confirm the delete command, an IP spoofing attack is still possible. To make the attack harder, host B can include a nonce, a pseudo-random number intended for one-time use, in the Are you sure message. When host B receives the request to delete files, it responds to host A with a confirmation request of the form Are you sure Please echo the random number 3957264392047453759 back if you are sure. If host A indeed wanted to delete all files, it would respond with Confirm delete all files confirmation number 3957264392047453759. The point of the nonce is that since host M does not know it (M does not receive the confirmation request), our adversary would not be able to issue a successful confirmation to delete the files. IP spoofing is much easier for non-connection-oriented protocols such as UDP than for connection-oriented protocols like TCP. TCP includes a sequence number in packets that is typically used to reorder packets if they arrive from the network out of order. However, if an attacker can successfully guess TCP sequence numbers, the attacker may be able to insert packets into a TCP conversation. When a TCP connection is established, the operating system chooses a TCP sequence number for the first packet in the conversation. If it does not do a good job choosing such a number at random, an attacker may be able to predict the next sequence number that will be used, and can use that information to set up a spoofed TCP connection. If you have further interest in IP spoofing, you can read more about it in Robert Morris s paper, A Weakness in the 4.2BSD UNIX TCP/IP Software (Morris 1985) or the more recent article from Phrack magazine entitled IP Spoofing Demystified (daemon9, route, and infinity 1996).
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There is sometimes a natural trade-off between security and convenience. We discuss this trade-off more in Section 2.3, but we ll briefly point out that the adoption of IP is an example of it here. IP was very convenient to deploy, and, partially as a result, it received wide adoption. On the other hand, if it were more secure but less convenient to deploy, it may not have been adopted as quickly or as widely. A protocol called IPsec was developed to require hosts to authenticate each other so that they cannot lie about their IP address or identity. Unfortunately, IPsec is not widely deployed on the public Internet.3
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3. While IPsec is not used to establish connections between two arbitrary computers on the Internet, it is used to construct virtual private networks (VPNs). A corporate VPN may use IPsec to route encrypted and integrity-protected traffic over the public Internet between two authenticated hosts on its intranet.
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