Zone based firewall wiki. Security Configuration Guide: Zone 2022-10-24
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A zone-based firewall is a network security system that controls inbound and outbound network traffic based on predetermined security rules. It operates by dividing a network into different zones, with each zone representing a specific level of trust. The firewall then enforces rules that allow or deny traffic between zones based on the level of trust associated with each zone.
One common use of a zone-based firewall is to separate a trusted network, such as a corporate network, from an untrusted network, such as the Internet. In this case, the corporate network would be designated as a trusted zone, while the Internet would be designated as an untrusted zone. The firewall would then enforce rules that allow traffic to flow freely between the trusted and untrusted zones, while denying traffic between the untrusted zone and any other trusted zones.
Another common use of a zone-based firewall is to segment a network into different areas, each with its own level of security. For example, a company may have a public-facing network for customers, a private network for employees, and a secure network for sensitive data. In this case, the firewall would enforce rules that allow traffic to flow freely between the public and private networks, while denying traffic between the private network and the secure network unless it meets certain security criteria.
One of the key advantages of a zone-based firewall is its ability to provide granular control over network traffic. Because the firewall enforces rules based on the source and destination zones, it can be configured to allow or deny specific types of traffic based on the needs of the network. This allows administrators to implement fine-grained security controls that are tailored to the specific needs of their organization.
Another advantage of a zone-based firewall is its scalability. Because the firewall operates at the network level, it can easily be configured to protect large networks with multiple zones and subnets. This makes it an ideal solution for organizations with complex network environments that require flexible and customizable security controls.
In summary, a zone-based firewall is a powerful tool for securing networks by controlling inbound and outbound traffic based on predetermined security rules. It allows administrators to implement fine-grained security controls and is well-suited for large, complex network environments.
Instead, all of the IP interfaces on the router are automatically made part of the self-zone when ZFW is configured. Creating a policy for a zone pairing In the most simple way to look at it a policy is a grouping of traffic along with along with a decision for how that traffic is handled. In this example, the access list 102 matches the deny condition and stops processing other entries in the access list. All traffic to any router interface is allowed until traffic is explicitly denied. This policy is applied on two interfaces in an IEEE IP bridge group. The default zone is applicable to interfaces where no security zone is associated.
So we reference this traffic in a policy map. One policy-map each for inbound and outbound zone-pairs can be applied that describes all of the traffic, or specific policy-maps per zone-pair can be applied. The following is a sample output from the show license all command when smart licensing is enabled globally. Often, attackers disguise their traffic as innocent traffic like DNS to bypass the firewall. Retrieved Sep 6, 2020.
Note You must perform at least one match step from Step 4, 5, or 6. Cisco IOS Software has supported traffic policing since Cisco IOS Release 12. Step12 ipv6 access-list access-list-name Example: Device config ipv6 access-list ipv6-acl Defines an IPv6 access list and enters IPv6 access list configuration mode. This necessitates a need to group the methods into various categories and have the user choose the action for each category. Thus, it provides more than enough information for other roles in IT: developers, system engineers, and support engineers. To access Cisco Feature Navigator, go to Table 2 Feature Information for Zone-Based Policy Firewalls Feature Name Releases Feature Information Debuggability Enhancement in Zone Based Firewall Phase-II Cisco IOS XE Release 3. A class identifies a set of packets based on its contents.
Application firewalls filter connections by examining the process ID of data packets against a rule set for the local process involved in the data transmission. When a firewall class map uses an ACL, the ACL must use the real IP addresses on the host to configure packet flows. . However, between protocols we want OR logic, as traffic cannot match 2 different protocols at the same time. These two interfaces are similar because they represent the internal network, so they can be grouped into a zone for firewall configurations. The Smart License support for Zone Based Firewall on ASR1000 feature implements support for smart licensing at a feature level for on Cisco ASR 1000 Series Aggregation Services Routers via the Universal K9 software image. In the example, for each filter ACL or UDP , there are statistics available for the number of packets and the number of bytes traversed through zone-based firewall.
The zone-member security command adds the dynamic interface to the corresponding zone. Flow Troubleshooting One day we were troubleshooting an application flow. The first part, the grouping of the traffic, is done by creating a class-map. Notice that the PAM list includes application services such as HTTP, NetBIOS, H. Note You cannot use VRF along with a firewall and a Stateful NAT64 configuration because Stateful NAT64 is not VRF-aware. If application-specific visibility into network activity is desired, you need to configure inspection for services by application name configure match protocol HTTP, match protocol telnet, and so on.
Computer and information security handbook. Otherwise, if the private zone harbors the potential for malicious users to compromise information, HTTP does not employ encryption to protect management traffic, and can reveal sensitive information such as user credentials or configuration. Create the zone policies for the LOCAL zone. Note Stateless NAT64 with firewall is not supported. This test was done with a Cisco 881 router running 15.
For more information on the Per Subscriber Firewall on LNS feature, see the A zone pair allows you to specify a unidirectional firewall policy between two security zones. ZFW differs from interface-based in that it only provides the actions transmit for policy conformance and drop for policy violation. The traffic that originates in the EdgeRouter itself will also be assigned to a zone: the local zone. This means ZFW can provide basic stateful inspection to permit or deny the traffic, as well as granular Layer 7 control on specific activities in the various protocols, so that certain application activities are allowed while others are denied. P2P Application Inspection and Control SDM 2. The dynamic PAT configuration directly helps conserve the scarce IPv4 address space while providing connectivity to the IPv4 Internet.
Step2 configure terminal Example: Device configure terminal Enters global configuration mode. Always insert protocol-specific statements above generic match protocol tcp or udp statements. TCP SYN Cookie Configuring Firewall TCP SYN Cookie module. If you are working as a developer or setting up systems and servers, remember that. By default, return traffic is not allowed.