Cisco Safe Firewall on AWS: Construct resilience at scale with stateful firewall clustering | Token Tech

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Organizations embrace the general public cloud for the agility, scalability, and reliability it affords when working functions. However simply as organizations want these capabilities to make sure their functions work the place and as wanted, additionally they require their safety to do the identical. Organizations can introduce a number of particular person firewalls into their AWS infrastructure to provide this outcome. In principle this can be a very good determination, however in apply this might result in uneven routing points. Advanced SNAT configuration can mitigate uneven routing points, however this isn’t sensible for sustaining public cloud operations. Organizations need to their long-term cloud methods by ditching SNAT and asking for a extra dependable and scalable resolution to attach their functions and safety for always-on safety.

To resolve these challenges, Cisco created a stateful firewall cluster with Safe Firewall on AWS.

Cisco Safe Firewall Clustering Overview

The firewall cluster for Safe Firewall Risk Protection Digital offers a extremely resilient and dependable structure to guard your AWS cloud surroundings. This functionality means that you can group a number of Safe Firewall Risk Protection digital home equipment collectively as a single logical equipment, referred to as a “cluster.”

A cluster offers all of the conveniences of a single equipment—administration and integration right into a community—whereas making the most of the elevated efficiency and redundancy you’d count on from deploying a number of home equipment individually. Cisco makes use of Cluster Management Hyperlink (CCL) to ahead uneven visitors throughout units within the cluster.

On this case, the grouping has the next features:

Determine 1: Cisco Safe Firewall Clustering Overview

The diagram above explains the visitors movement between the consumer and the server with the insertion of the firewall cluster within the community. The features of clustering and the way the packet movement interacts at every step are outlined under.

Grouping of roles and tasks

Proprietor: The Proprietor is the cluster node that originally receives the connection.

    • the Proprietor maintains TCP state and processes packets.
    • A connection has just one Proprietor.
    • sure the unique Proprietor fails, the brand new node receives the packets and the Director select a brand new Proprietor of the accessible nodes within the cluster.

backup proprietor: The node that shops the TCP/UDP standing data acquired from the Proprietor in order that the connection could be seamlessly transferred to a brand new proprietor within the occasion of a failure.

Director: The Director is the node within the cluster that handles search requests for homeowners of the Forwarder(s).

    • When the Proprietor obtain a brand new connection, select a Director primarily based on a hash of the supply/vacation spot IP handle and ports. the Proprietor then ship a message to Director to register the brand new connection.
    • If the packets arrive at any node aside from the Proprietorthe node queries the Director. the Director then discover and outline the Proprietor node in order that the Promoter can redirect packets to the right vacation spot.
    • A connection has just one Director.
    • if a Director fails, the Proprietor select a brand new Director.

Promoter: The Promoter is a node within the cluster that redirects packets to the Proprietor.

    • if a Promoter receives a packet for a connection that doesn’t belong to it, seek the advice of the Director to search for the Proprietor.
    • as soon as the Proprietor is outlined, the Promoter establishes a movement and redirects any future packets it receives for this connection to the outlined one Proprietor.

Fragment Proprietor: For fragmented packets, the cluster nodes that obtain a fraction decide a Fragment Proprietor utilizing a hash of the fragment’s supply IP handle, vacation spot IP handle, and packet ID. Then all fragments are redirected to the Fragment Proprietor over the cluster management hyperlink.

Integration with AWS Gateway Load Balancer (GWLB)

In model 7.1 of Safe Firewall Risk Protection, Cisco added assist for AWS Gateway Load Balancer (Determine 2). This function permits organizations to scale their firewall footprint as wanted to fulfill demand (see particulars right here).

Determine 2: Cisco Safe Firewall and AWS Gateway Load Balancer Integration

Cisco Safe Firewall Cluster on AWS

Constructing on the determine above, organizations can leverage AWS Gateway Load Balancer with Safe Firewall’s clustering functionality to evenly distribute visitors throughout the Safe Firewall cluster. This enables organizations to maximise the advantages of clustering capabilities, together with elevated efficiency and redundancy. Determine 3 exhibits how putting a Safe Firewall cluster behind the AWS Gateway Load Balancer creates a resilient structure. Let’s take a more in-depth take a look at what is going on on within the diagram.

Determine 3: Cisco Safe Firewall Cluster on AWS

Determine 3 exhibits an Web person seeking to entry a workload. Earlier than the person can entry the workload, the person’s visitors is routed to firewall node 2 for inspection. The visitors movement for this instance consists of:

Person -> IGW -> GWLBe -> GWLB -> Safe Firewall (2) -> GLWB -> GWLBe -> Workload

Within the occasion of a failure, AWS Gateway Load Balancer drops present connections to the failed node, making the above resolution stateless.

AWS not too long ago introduced a brand new function for its load balancers referred to as Goal Failover for Present Flows. This function permits present connections to be forwarded to a different vacation spot within the occasion of a failure.

Cisco is an early adopter of this function and has mixed Goal Failover for present flows with Safe Firewall clustering capabilities to create the business’s first stateful cluster on AWS.

Determine 4: Cisco Safe Firewall Clustering Repeating Present Move on a New Node

Determine 4 exhibits a firewall failure occasion and the way AWS Gateway Load Balancer makes use of the Goal Failover for Present Flows function to vary the visitors movement of firewall node 2 a Firewall node 3. The visitors movement for this instance consists of:

Person -> IGW -> GWLBe -> GWLB -> Safe Firewall (3) -> GLWB -> GWLBe -> Workload


Organizations want dependable and scalable safety to guard always-on functions of their AWS cloud surroundings. With Cisco’s stateful firewall clustering capabilities, organizations can shield their functions whereas sustaining the advantages of the cloud, comparable to agility, scalability, and reliability.

Cisco Safe Firewall Risk Protection Digital is offered on the AWS Market and affords options comparable to firewall, software visibility and management, IPS, URL filtering, and malware protection. Cisco affords versatile choices for firewall licensing, comparable to Pay As You Go (PAYG) and Carry Your Personal License (BYOL). To be taught extra about how Cisco Safe Firewall’s clustering capabilities may help shield your AWS functions, try our extra assets, try our free 30-day trial, or speak to your Cisco gross sales consultant.

Further Sources

Cisco Safe Firewall Cloud Clustering

Constructing a Scalable Safety Structure on AWS with Cisco Safe Firewall and AWS Gateway Load Balancer

Introducing AWS Gateway Load Balancer Failover for Present Flows

Safe Firewall for Public Cloud internet web page

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Cisco Secure Firewall on AWS: Build resilience at scale with stateful firewall clustering