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130 ServerIron ADX Security Guide
53-1002440-03
DDoS protection
5
Configuring a rule for icmp-type options
ServerIron ADX has a set of built-in rules to manage icmp-type options. In this case, the
rule-icmp-type command is used with a <icmp-option-attack> variable specified in Table 15.
The following example configures the "filter3" security filter with a rule to drop packets that contain
the icmp-type echo-reply type.
ServerIronADX(config)# security filter filter3
ServerIronADX(config-sec-filter3)# rule icmp-type echo-reply drop
Syntax: [no] rule icmp-type <icmp-type> [log | no-log] [drop | no-drop]
The <icmp-type> variable can be one of the options described in Table 15
The log parameter directs the ServerIron ADX to drop traffic on the bound interface that matches
the rule specified by the configured <icmp-type>. The no-log parameter disables this function.
The drop parameter directs the ServerIron ADX to drop traffic on the bound interface that matches
the rule specified by the configured <icmp-type>. The no-drop parameter disables this function
TABLE 15 icmp option types and descriptions
ICMP Option Type Description
icmp-type addr-mask icmp type 17: addr-mask
timestamp-reply icmp type 14: timestamp-reply
icmp-type addr-mask-reply addr-mask-reply: icmp type 18: addr-mask-reply
icmp-type destination <type> icmp type 3: destination-unreachable.
The <type> variable is specified as one of the following values.
iadmin-prohibit
fragment-needed
host-admin-prohibited
host-precedence-violation
host-unknown
host-unreachable
host-unreachable-for-tos
net-admin-prohibited
net-unknown
net-unreachable
network-unreachable-for-tos
port-unreachable
precedence-cutoff
protocol-unreachable
route-fail
source-host-isolated
code 13: admin-prohibit
code 4: fragment-needed
code 10: destination-host-admin-prohibited
code 14: host-precedence-violation
code 7: destination-host-unknown
code 1: host-unreachable
code 12: host-unreachable-for-tos
code 9: destination-network-admin-prohibited
code 6: net-unknown
code 0: network-unreachable
code 11: network-unreachable-for-tos
code 3: port-unreachable
code 15: precedence-cutoff-in-effect
code 2: protocol-unreachable
code 5: route-fail
code 8: source-host-isolate
icmp-type echo-reply icmp type 0: echo-reply
icmp-type echo-request icmp type 8: echo-request
icmp-type info-reply icmp type 16: information-reply
icmp-type info-request icmp type 15: information-request
icmp-type param-problem icmp type 12: parameter-problem
icmp-type redirect icmp type 5: redirect