SMC Networks SMC7908VoWBRA manual 4-59, DoS Criteria and Port Scan Criteria

ADVANCED SETUP

•DoS Criteria and Port Scan Criteria

Set up DoS and port scan criteria in the spaces provided (as shown below).

Parameter	Defaults	Description
Total incomplete	300	Defines the rate of new unestablished sessions
TCP/UDP sessions	sessions	that will cause the software to start deleting
HIGH		half-open sessions.
Total incomplete	250	Defines the rate of new unestablished sessions
TCP/UDP sessions	sessions	that will cause the software to stop deleting half-
LOW		open sessions.
Incomplete	250	Maximum number of allowed incomplete
TCP/UDP sessions	sessions	TCP/UDP sessions per minute.
(per min) HIGH
Incomplete	200	Minimum number of allowed incomplete
TCP/UDP sessions	sessions	TCP/UDP sessions per minute.
(per min) LOW
Maximum incomplete	10	Maximum number of incomplete TCP/UDP
TCP/UDP sessions		sessions from the same host.
number from same
host

Incomplete	300
TCP/UDP sessions	msec
detect sensitive time
period
Maximum half-open	30
fragmentation packet
number from same
host
Half-open	10000
fragmentation detect	msec
sensitive time period
Flooding cracker	300
block time	second

Length of time before an incomplete TCP/UDP session is detected as incomplete.

Maximum number of half-open fragmentation packets from the same host.

Length of time before a half-open fragmentation session is detected as half-open.

Length of time from detecting a flood attack to blocking the attack.

Note: The firewall does not significantly affect system performance, so we advise enabling the prevention features to protect your network.

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