The Firewall module provides bidirectional stateful firewall protection. It prevents denial of service attacks and provides coverage for all IP-based protocols and frame types as well as filtering for ports and IP and MAC addresses.
The Firewall section of the
You can configure this policy or computer to inherit its firewall On/Off state from its parent policy or you can lock the setting locally.
Firewall Stateful Configurations
Select which firewall stateful configuration to apply to this policy. If you have defined multiple Interfaces for this policy (above), you can specify independent configurations for each interface. For more information on creating a stateful configuration see Define stateful configurations.
Assigned Firewall Rules
Displays the firewall rules that are in effect for this policy or computer. To add or remove firewall rules, click Assign/Unassign This will display a window showing all available firewall rules from which you can select or deselect rules.
To edit the Rule locally, right-click the rule and click Properties.
To edit the Rule globally, right-click the rule and click Properties (Global).
For more information on creating firewall rules, see Create a Firewall rule.
You can configure this policy or computer to inherit its Interface Isolation enabled or disabled state from its parent policy or you can lock the setting locally.
Before you enable Interface Isolation make sure that you have configured the interface patterns in the proper order and that you have removed or added all necessary string patterns. Only interfaces matching the highest priority pattern will be permitted to transmit traffic. Other interfaces (which match any of the remaining patterns on the list) will be "restricted". Restricted Interfaces will block all traffic unless an Allow Firewall Rule is used to allow specific traffic to pass through.
When Interface Isolation is enabled, the firewall will try to match the regular expression patterns to interface names on the local computer.
Only interfaces matching the highest priority pattern will be permitted to transmit traffic. Other interfaces (which match any of the remaining patterns on the list) will be "restricted". Restricted Interfaces will block all traffic unless an Allow firewall rule is used to allow specific traffic to pass through.
Selecting Limit to one active interface will restrict traffic to only a single interface (even if more than one interface matches the highest priority pattern).
The Reconnaissance page allows you to enable and configure traffic analysis settings on your computers. This feature can detect possible reconnaissance scans that attackers often use to discover weaknesses before beginning a targeted attack.
- Reconnaissance Scan Detection Enabled: Turn the ability to detect reconnaissance scans on or off.
- Computers/Networks on which to perform detection: Choose from the list the IPs to protect. Choose from existing IP Lists. (You can use the Policies > Common Objects > Lists > IP Lists page to create an IP List specifically for this purpose.)
- Do not perform detection on traffic coming from: Select from a set of IP Lists which computers and networks to ignore. (As above, you can use the Policies > Common Objects > Lists > IP Lists page to create an IP List specifically for this purpose.)
For each type of attack, the
Once an attack has been detected, you can instruct the agents to block traffic from the source IPs for a period of time. Use the Block Traffic lists to set the number of minutes.
- Computer OS Fingerprint Probe: The agent detects an attempt to discover the computers OS.
- Network or Port Scan: The agent reports a network or port scan if it detects that a remote IP is visiting an abnormal ratio of IPs to ports. Normally, an agent computer will only see traffic destined for itself, so a port scan is the most common type of probe that will be detected. The statistical analysis method used in computer or port scan detection is derived from the "TAPS" algorithm proposed in the paper "Connectionless Port Scan Detection on the Backbone" presented at IPCCC in 2006.
- TCP Null Scan: The agent detects packages with no flags set.
- TCP SYNFIN Scan: The agent detects packets with only the SYN and FIN flags set.
- TCP Xmas Scan: The agent detects packets with only the FIN, URG, and PSH flags set or a value of 0xFF (every possible flag set).
The agent reports a computer or port scan if it detects that a remote IP is visiting an abnormal ratio of IPs to ports. Normally an agent computer will only see traffic destined for itself, so a port scan is by far the most common type of probe that will be detected. However, if a computer is acting as a router or bridge it could see traffic destined for a number of other computers, making it possible for the agent to detect a computer scan (ex. scanning a whole subnet for computers with port 80 open).
Detecting these scans can take several seconds since the agent needs to be able to track failed connections and decide that there are an abnormal number of failed connections coming from a single computer in a relatively short period of time.
For information on how to handle reconnaissance warnings, see Warning: Reconnaissance Detected.
Set whether to generate events for packets that are "Out of Allowed Policy". These are packets that have been blocked because they have not been specifically allowed by an Allow firewall rule. Setting this option to Yes may generate a large number of events depending on the firewall rules you have in effect.
Firewall events are displayed the same way as they are in the main Workload Security console window except that only events relating to this policy or specific computer are displayed.