IP Configuration Configuring IP
page 24-26 OmniSwitch AOS Release 6 Network Configuration Guide September 2009
In the next minute, 10 more TCP and UDP closed port packets are received, along with 200 UDP open-
port packets. This would bring the total penalty value to 4300, as shown using the following equation:
(100 previous minute value) + (10 TCP X 10 penalty) + (10 UDP X 10 penalty) +
(200 UDP X 20 penalty) = 4300
This value would be divided by 2 (due to decay) and decreased to 2150. The switch would record a port
scan and generate a trap to warn the administrator:
The above functions and how to set their values are covered in the sections that follow.
Setting Penalty Values
There are three types of traffic you can set a penalty value for:
• TCP/UDP packets bound for closed ports.
• TCP traffic bound for open ports.
• UDP traffic bound for open ports.
Each type has its own command to assign a penalty value. Penalty values can be any non-negative integer.
Each time a packet is received that matches an assigned penalty, the total penalty value for the switch is
increased by the penalty value of the packet in question.
To assign a penalty value to TCP/UDP packets bound for a closed port, use the ip dos scan close-port-
penalty command with a penalty value. For example, to assign a penalty value of 10 to TCP/UDP packets
destined for closed ports, enter the following:
-> ip dos scan close-port-penalty 10
To assign a penalty value to TCP packets bound for an open port, use the ip dos scan tcp open-port-
penalty command with a penalty value. For example, to assign a penalty value of 10 to TCP packets
destined for opened ports, enter the following:
-> ip dos scan tcp open-port-penalty 10
To assign a penalty value to UDP packets bound for an open port, use the ip dos scan udp open-port-
penalty command with a penalty value. For example, to assign a penalty value of 10 to TCP/UDP packets
destined for closed ports, enter the following:
-> ip dos scan udp open-port-penalty 10
DoS Settings
UDP/TCP closed = 10
UDP open =20
TCP open = 5
Threshold = 2000
Decay = 2
Minute 2 Penalty Total = 2150
Generate DoS
Attack Warning
Trap
10 TCP closed port packets
10 UDP closed port packets
100 UDP open port packets
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