Comodo Firewall allows you to customize firewall security by using the Firewall Security Level slider to change preset security levels.
The choices available are:
Safe Mode (This is default mode)
The setting you choose here is also displayed on the summary screen.
Block All Mode: The firewall blocks all traffic in and out of your computer regardless of any user-defined configuration and rules. The firewall does not attempt to learn the behavior of any applications and does not automatically create traffic rules for any applications. Choosing this option effectively prevents your computer from accessing any networks, including the Internet.
Custom Policy Mode: The firewall applies ONLY the custom security configurations and network traffic policies specified by the user. New users may want to think of this as the 'Do Not Learn' setting because the firewall does not attempt to learn the behavior of any applications. Nor does it automatically create network traffic rules for those applications. You will receive alerts every time there is a connection attempt by an application - even for applications on the Comodo Safe list (unless, of course, you have specified rules and policies that instruct the firewall to trust the application's connection attempt).
If any application tries to make a connection to the outside, the firewall audits all the loaded components and checks each against the list of components already allowed or blocked. If a component is found to be blocked, the entire application is denied Internet access and an alert is generated. This setting is advised for experienced firewall users that wish to maximize the visibility and control over traffic in and out of their computer.
Safe Mode (Default): While filtering network traffic, the firewall automatically creates rules that allow all traffic for the components of applications certified as 'Safe' by Comodo, if the checkbox Create rules for safe applications is selected. For non-certified new applications, you will receive an alert whenever that application attempts to access the network. Should you choose, you can grant that application Internet access by choosing 'Treat this application as a Trusted Application' at the alert. This deploys the predefined firewall policy 'Trusted Application' onto the application.
'Safe Mode' is the recommended setting for most users - combining the highest levels of security with an easy-to-manage number of connection alerts.
Training Mode : The firewall monitors network traffic and create automatic allow rules for all new applications until the security level is adjusted. You will not receive any alerts in 'Training Mode' mode. If you choose the 'Training Mode' setting, we advise that you are 100% sure that all applications installed on your computer are assigned the correct network access rights.
Tip: Use this setting temporarily while playing an online game for the first time. This suppresses all alerts while the firewall learns the components of the game that need Internet access and automatically create 'allow' rules for them. You can switch back to your previous mode later.
Disabled: Disables the firewall and makes it inactive. All incoming and outgoing connections are allowed irrespective of the restrictions set by the user. Comodo strongly advise against this setting unless you are sure that you are not currently connected to any local or wireless networks.
Check boxes -
Keep an alert on screen for maximum (n) seconds
Determines how long the Firewall shows an alert for without any user intervention. By default, the timeout is set at 120 seconds. You may adjust this setting to your own preference.
The application/file is included in the Trusted Files list under Defense+ Tasks;
The application is from a vendor included in the Trusted Software Vendors list under Defense+ Tasks;
The application is included in the extensive and constantly updated Comodo safelist.
By default, CIS does not automatically create ‘allow’ rules for safe applications. This helps saving the resource usage, simplifies the rules interface by reducing the number of 'Allowed' rules in it, reduces the number of pop-up alerts and is beneficial to beginners who find difficulties in setting up the rules.
Enabling this checkbox instructs CIS to begin learning the behavior of safe applications so that it can automatically generate the 'Allow' rules. These rules are listed in the Network Security Policy > Application Rules interface. The Advanced users can edit/modify the rules as they wish (Default = Disabled).
|Background Note: Prior to version 4.x , CIS would automatically add an allow rule for ‘safe’ files to the rules interface. This allowed advanced users to have granular control over rules but could also lead to a cluttered rules interface. The constant addition of these ‘allow’ rules and the corresponding requirement to learn the behavior of applications that are already considered ‘safe’ also took a toll on system resources. In version 4.x and above, ‘allow’ rules for applications considered ‘safe’ are not automatically created – simplifying the rules interface and cutting resource overhead with no loss in security. Advanced users can re-enable this setting if they require the ability to edit rules for safe applications (or, informally, if they preferred the way rules were created in CIS version 3.x).
Automatically detect new private networks – Instructs Comodo Firewall to keep monitoring whether your computer is connected to any new wired or wireless network. The firewall will display an alert as shown below on detecting a network, e.g. when you connect to a wired home or office local area network, a Wi-Fi network at an airport , cafeteria and so on.
You can select the type of new network you are connected to, so that the firewall configuration is optimized for the type of connection. Comodo recommends users to leave this option at its default, enabled setting (Default = Enabled).
Show Trustconnect alerts for unsecured wireless networks - If you are connecting to Internet through a new wireless network, e.g. a Wi-Fi connection at a restaurant, the network needs to be encrypted and secure. Performing your Internet routed activities through an unsecure wireless network proves the risk of exposing your communication and revealing your confidential information to potential hackers.
On detection of your Internet connection through a new wireless network, Comodo Firewall checks whether the network is encrypted and secure. If the network is unsecure, the firewall will display an alert as shown below, if this option is enabled. (Default = Enabled).
The alert enables you to secure your connection by using TrustConnect - secure Internet proxy service that creates an encrypted connection session. For more details, refer to TrustConnect Overview.
Show Trustconnect alerts for public networks - If you are connecting to Internet through a new wired or wireless network at a public place like an airport or a coffee shop, irrespective of whether the network is wired or wireless, you are exposed to a danger of other people in the same network gaining access to your computer and hack or steal your confidential information. In order to safeguard your connection session against such attempts, Comodo recommends to encrypt your connection using TrustConnect - a secure Internet proxy service.
Comodo Firewall will display an alert as shown below if you are connecting to Internet through a new network in a public place and select 'I am at PUBLIC PLACE' in the 'New Network Detected' dialog, if this option is enabled. (Default = Enabled).
The alert enables you to secure your connection by using TrustConnect. For more details, refer to TrustConnect Overview.
Enable IPv6 filtering - Enabling this options means CIS will filter IPv6 network traffic in addition to IPv4 traffic. (Default = Disabled)
Background Note: IPv6 stands for Internet Protocol Version 6 and is intended to replace Internet Protocol Version 4 (IPv4). The move is primarily driven by the anticipated exhaustion of available IP addresses. IPv4 was developed in 1981 and is still the most widely deployed version – accounting for almost all of today’s Internet traffic. However, because IPv4 uses 32 bits for IP addresses, there is a physical upper limit of around 4.3 billion possible IP addresses – a figure widely viewed as inadequate to cope with the further expansion of the Internet. In simple terms, the number of devices requiring IP addresses is in danger of exceeding the number of IP addresses that are available. This hard limit has already led to the development of ‘work-around’ solutions such as Network Address Translation (NAT), which enable multiple hosts on private networks to access the Internet using a single IP address.
IPv6 on the other hand, uses 128 bits per address (delivering 3.4×1038 unique addresses) and is viewed as the only realistic, long term solution to IP address exhaustion. IPv6 also implements numerous enhancements that are not present in IPv4 – including greater security, improved support for mobile devices and more efficient routing of data packets.
Do not show popup alerts - This option allows you to configure whether or not to show firewall alerts when malware is encountered. Choosing ‘Do not show popup alerts’ will minimize disturbances but at some loss of user awareness. If you choose not to show popup alerts then you have a choice of default responses that CIS should automatically take – either ‘Block Requests' or 'Allow Requests’. (Default = Enabled )
Show traffic animation in the tray - By default, the Comodo Internet Security's 'Shield' tray icon displays a small animation whenever traffic moves to or from your computer.
If the traffic is outbound, you can see green arrows moving upwards on the right hand side of the shield. Similarly, for inbound traffic you can see red arrows moving down the left hand side. This provides a very useful indicator of the real-time movement of data in and out of your computer. Clear this check box If you would rather not see this animation (Default = Enabled).
Comodo Internet Security User Guide | © 2012 Comodo Security Solutions Inc. | All rights reserved