Type the maximum number of address or port scans to allow per second from the same IP address.Select or clear the Block Port Scan and the Block IP Scan check boxes.The Default Packet Handling page appears. Select Firewall > Default Packet Handling.To protect against network port scans, from Fireware Web UI: This uses bandwidth and resources on the Firebox and provides the attacker with information about your firewall. You are less likely to block legitimate network traffic if you use a higher number, but the Firebox must send TCP reset packets for each connection it drops. However, if you set the number too low, the Firebox might identify legitimate network traffic as an attack and deny the traffic. To block attackers more quickly, you can set the threshold for the maximum allowed number of address or port scans per second to a lower value. You can change the settings for this feature, and change the maximum allowed number of address or port scans per second for each source IP address (the default value is 10). The default configuration of the Firebox blocks network scans. To Protect Against Port Scan and IP Address Scans You cannot disable these features for specified IP addresses, specified Firebox interfaces, or different time periods. When the Block Port Scan, Block IP Scan or Auto-block source IP of unhandled external packets check boxes are selected, all inbound traffic is examined by the Firebox. If the number of packets sent to different IP addresses or destination ports in one second is larger than the number you select, the source IP address is added to the Blocked Sites list. The addresses can include the primary IP addresses and any secondary IP addresses configured on the interface. To identify a port scan, your Firebox counts the number of packets sent from one IP address to any Firebox interface IP address. How the Firebox Identifies Network ScansĪn IP address space scan is identified when a computer sends a specified number of packets to different IP addresses assigned to a Firebox interface. IP address scans examine a network to see which network devices are on that network.įor more information about ports, see About Ports. Port scans examine a computer to find the services that it uses. An IP scan is TCP or UDP traffic that is sent to a range of network addresses. These ports can be in sequence or random, from 0 to 65535. A port scan is TCP or UDP traffic that is sent to a range of ports. Attackers frequently look for open ports as starting points to launch network attacks.
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