5-25
Cisco Content Services Switch Administration Guide
OL-5647-02
Chapter 5 Configuring Simple Network Management Protocol (SNMP)
Configuring Denial of Service (DoS)
The dos_attack_type variable is the type of DoS attack event to trap. The options
include:
• dos-illegal-attack - Generates traps for illegal addresses, either source or
destination. Illegal addresses are loopback source addresses, broadcast source
addresses, loopback destination addresses, multicast source addresses, or
source addresses that you own. The default trap threshold for this type of
attack is 1 per second.
• dos-land-attack - Generates traps for packets that have identical source and
destination addresses. The default trap threshold for this type of attack is
1 per second.
• dos-smurf-attack - Generates traps when the number of pings with a
broadcast destination address exceeds the threshold value. The default trap
threshold for this type of attack is 1 per second.
• dos-syn-attack - Generates traps when the number of TCP connections that
are initiated by a source, but not followed with an acknowledgment (ACK)
frame to complete the 3-way TCP handshake, exceeds the threshold value.
The default trap threshold for this type of attack is 10 per second.
Use the trap-threshold option to override a default trap threshold. For the
threshold_value, enter a number from 1 to 65535.
For example, to enable the CSS to generate traps for packets that have identical
source and destination addresses, enter:
(config)# snmp trap-type enterprise dos-land-attack
To prevent the CSS from generating DoS attack event traps, enter:
(config)# no snmp trap-type enterprise dos_attack_type
Displaying DoS Configurations
Use the show dos command to display detailed information about DoS attacks on
each CSS Session Processor (SP). The show dos command displays the following
information:
• The total number of attacks since booting the CSS
• The types of attacks and the maximum number of these attacks per second
• The first and last occurrence of an attack
• The source and destination IP addresses
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