Allied Telesis AT-iMG634 - R2 User's Guide Page 434

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Firewall Firewall command reference
iMG/RG Software Reference Manual (IPNetwork Functions)
4-132
Example --> firewall set IDS floodthreshold 25
See also security set IDS floodthreshold
4.3.2.0.30 FIREWALL SET IDS PORTFLOODTHRESHOLD
Syntax FIREWALL SET IDS PORTFLOODTHRESHOLD <MAX>
Description This command allows you to set the maximum number of SYN packets that can be sent
to a single port before a port flood is detected. If the number of SYN packets counted
within the time duration set by the command FIREWALL SET IDS FLOODPERIOD is
greater than the maximum value set here, the suspected attacker is blocked for the time
limit specified in the command FIREWALL SET IDS DOSATTACKBLOCK.
For example, using the default settings, if more than 10 SYN packets are received per
second for a 10 second duration, the attacker is blocked.
Note: This command is nothing but an alias of the corresponding “security set IDS” command
Options The following table gives the range of values for each option that can be specified with
this command and a Default Value (if applicable).
Example --> firewall set IDS portfloodthreshold 15
See also security set IDS portfloodthreshold
4.3.2.0.31 FIREWALL SET IDS SCANPERIOD
Syntax FIREWALL SET IDS SCANPERIOD <DURATION>
Description This command allows you to set the time limit during which scanning type traffic (such as
closed TCP port reviving SYN/ACK, FIN or RST) is counted. If the number of scanning
packets counted within the specified duration is greater than the threshold set by FIRE-
WALL SET IDS SCANTHRESHOLD, the suspected attacker is blocked for the time limit
specified in the command FIREWALL SET IDS SCANATTACKBLOCK.
Note: This command is nothing but an alias of the corresponding “security set IDS” command
Options The following table gives the range of values for each option that can be specified with
this command and a Default Value (if applicable).
Option Description Default Value
max Maximum number of SYN packets that can be
received by a single port before a flood is detected.
10 (per second)
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