October 2012
Intermediate to advanced
476 pages
10h 45m
English
book
Network Attacks and Defenses
by Zouheir Trabelsi, Kadhim Hayawi, Arwa Al Braiki, Sujith Samuel Mathew
Content preview from Network Attacks and Defenses
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236 ◾ Network Attacks and Defenses: A Hands-on Approach
This tracking method is about the only way ICMP can enter
into a state table.
For example, after receiving the ICMP echo request packet
shown below,
Packet Source IP
Destination
IP Type Code Identifier
Sequence
number
Packet #1 192.168.1.5 192.168.2.10 8 0 200 1
the stateful firewall creates a new entry in its ICMP session’s
cache as shown below.
ICMP
session Source IP
Destination
IP Type Code Identifier
Sequence
number
Session
State
Session #1 192.168.1.5 192.168.2.10 1200 80 200 1 Request
Therefore, the ICMP echo reply packet that follows will be
accepted by the stateful firewall, as it includes the ...
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