Suppose an idle TCP connection exists between sockets A and B. A third party has eavesdropped and knows the current sequence number at both ends. (a) Suppose the third party sends A a forged packet ostensibly from B and with 100 bytes of new data. What happens? (Hint: Look up in Request for Comments 793 what TCP does when it receives an ACK that is not an "acceptable ACK.") (b) Suppose the third party sends each end such a forged 100-byte data packet ostensibly from the other end. What happens now? What would happen if A later sent 200 bytes of data to B?

Suppose an idle TCP connection exists between sockets A and B. A third party has eavesdropped and knows the current sequence number at both ends. (a) Suppose the third party sends A a forged packet ostensibly from B and with 100 bytes of new data. What happens? (Hint: Look up in Request for Comments 793 what TCP does when it receives an ACK that is not an "acceptable ACK.") (b) Suppose the third party sends each end such a forged 100-byte data packet ostensibly from the other end. What happens now? What would happen if A later sent 200 bytes of data to B?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Suppose an idle TCP connection exists between
sockets A and B. A third party has
eavesdropped and knows the current sequence
number at both ends.
(a) Suppose the third party sends A a forged
packet ostensibly from B and with 100 bytes of
new data. What happens? (Hint: Look up in
Request for Comments 793 what TCP does
when it receives an ACK that is not an
"acceptable ACK.")
(b) Suppose the third party sends each end such
a forged 100-byte data packet ostensibly from
the other end. What happens now? What would
happen if A later sent 200 bytes of data to B?

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