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As with all cloud vendors, AWS users share responsibility for securing their infrastructure against risk. Amazon provides the tools you... AWS Security group architecture for AWS: How to overcome security group limits Prof. Avishai Wool 2 min read Prof. Avishai Wool Short bio about author here Lorem ipsum dolor sit amet consectetur. Vitae donec tincidunt elementum quam laoreet duis sit enim. Duis mattis velit sit leo diam. Tags Share this article 8/9/23 Published As with all cloud vendors, AWS users share responsibility for securing their infrastructure against risk. Amazon provides the tools you need to filter traffic, but configuring those tools is up to you. Firewalls are one of the tools you’ll use to filter traffic and secure Virtual Private Cloud (VPC) instances. Instead of using traditional firewalls, Amazon provides users with AWS security groups, which are flexible, stateful firewalls capable of filtering inbound and outbound traffic. However, there are limits to what you can do with AWS security groups. First, they only allow traffic – you can’t configure them to deny traffic. Second, the maximum number of rules you can set for a single group is 60. This isn’t a big issue for an Amazon EC2 instance designed to address inbound traffic. You’ll either want your AWS EC2 to accept ingress from the entire internet or you’ll want to configure access for a few internal IP addresses. But for outbound traffic, 60 rules simply isn’t enough. You’ll use a dozen of them just allowing access to GitHub’s API . Add in a few third-party partners and you’re already well past the limit. Amazon VPC resource limits explained Amazon sets clear limits on the AWS services and resources it makes available to users. In some cases, you can increase these limits by contacting AWS support. These limits are generally assessed on a per-Region basis. Here are some of the limits Amazon places on AWS users: Security group limits 2500 VPC security groups per Region 60 IPv4 rules per security group 60 IPv6 rules per security group 5 security groups per network interface VPC and subnet limits 5 VPCs per Region 200 Subnets per VPC 5 IPv4 CIDR blocks per VPC 5 IPv6 CIDR blocks per VPC Limits to elastic IP addresses and gateways 5 Elastic IP addresses per Region 2 Elastic IP Addresses per public NAT gateway 5 Egress-only internet gateways per Region 5 NAT gateways per Availability Zone One carrier gateway per VPC Prefix list limits 100 prefix lists per Region 1000 versions per prefix list 5000 prefix list references per resource type Network ACL limits 200 Network ACLs per VPC 20 Rules per Network ACL How to manage AWS cloud security group limits effectively Traditional firewalls may have thousands of security rules, including a complex combination of inbound rules and egress filters. Crucially, they can also enforce outbound rules that include denying traffic – something Amazon does not allow regular security groups to do. While AWS offers powerful tools for securing cloud workflows, Amazon VPC users must find ways to overcome these limitations. Fortunately, there are a few things you can do to achieve exactly that. Optimize your VPC security groups. Use Network Access Control Lists to secure assets at the subnet level. Use a domain name filtering system that reduces the number of IP addresses security group rules need to resolve. Optimize your Amazon virtual private cloud configuration Amazon VPC is a virtual network that contains many of the elements you’d expect from a traditional network. It has IP addresses, route tables, subnets, and internet gateways. Unlike a traditional network, you can easily configure many of your VPC environment through a command line interface (CLI). You can establish VPC peering connections, implement identity and access management (IAM) protocols, and configure elastic network interfaces without manually handling any hardware. But first, you need to set up and protect your VPC by setting up and configuring security groups. If you don’t specify a particular group, Amazon EC2 will use the default security group. If you haven’t added new security groups since creating your AWS account, you may only have that one default security group. The first step to optimizing security is expanding the number of security groups you have available. Here’s an example of the code you can use to create a new security group in the AWS console:aws ec2 create-security-group –group-name web-pci-sg –description “allow SSL traffic” –vpc-id vpc-555666777 This creates a new group named web-pci-sg and describes it as a group designed to allow SSL traffic on the network. Remember that security groups don’t support deny rules. Here is the code you would use to add a rule to that group: aws ec2 authorize-security-group-ingress \ –group-name web-pci-sg \ –protocol https \–port 443 \ –cidr This rule specifically allows SSL traffic using the HTTPS protocol to use port 443, which is the standard port for HTTPS traffic. You can use the last argument to specify the cidr block the rule will direct traffic through. This gives you the ability to manage traffic through specific subnets, which is important for the next step. This example focuses on just one type of rule in one context. To take full advantage of the security tools AWS makes available, you’ll want to create custom rules for endpoints, load balancers, nat gateways, and more. Although you’re limited to 60 rules per security group, creating many groups lets you assign hundreds of rules to any particular instance. Security architecture and network ACLs Network Access Control Lists provide AWS users with additional filtering capabilities. Network ACLs are similar to security groups in many ways, but come with a few key differences: Network ACLs can contain deny rules. You can write Network ACL rules to include explicit actions, like blocking particular IP addresses or routing VPN users in a specific way. Network ACLs are enforced at the subnet level. This means they apply to every instance in the subnet, in addition to whatever rules exist at the security group level. As mentioned above, each Network ACL can contain up to 20 rules. However, you can have up to 200 Network ACLs per VPC, which gives you a total of 4000 potential rules. Along with instance-specific security group rules, this offers much more flexibility for setting up robust AWS security architecture. Since Network ACLs can deny traffic, they are a useful tool for managing access to databases and other sensitive assets. For example, you may wish to exclude users who don’t have the appropriate permissions from your Amazon RDS instance. You may also want to filter SSH (Secure Shell) connections coming from unknown sources, or limit connections between different internal instance types. To do this effectively, you need to group these assets under the same subnet and make sure that the appropriate rules are enabled for all of them. You can also write asset-specific rules at the security group level, ensuring every asset has its own optimal configuration. The larger your AWS environment is, the more complex this process may become. Take care to avoid misconfigurations – it’s very easy to accidentally write security group rules and Network ACL rules that aren’t compatible, or that cause problems when you access the instance. To avoid this, try to condense your rules as much as possible. Avoid limits by filtering domain names directly Although you can create a large number of rules by creating additional security groups, you still may want to add more than 60 rules in a single group. There are many scenarios where this makes more sense than arbitrarily adding (and managing) new groups. For example, you might have a production instance that needs updates from several third-party partners. You also need to periodically change and update the technologies this instance relies on, so you’d like to keep its rules in a single security group. This reduces misconfiguration risk by keeping all the relevant rules in one place – not spread out across multiple groups. To overcome this limit, you need to reduce the number of IP addresses that the security group filters. You can do this by deploying a third-party solution that allows security rules to perform DNS resolution. This eliminates the need for AWS to resolve the domain name. Since AWS security groups can’t compute domain names on their own, you’ll need to deploy a third-party NAT gateway on your public VPC to filter outbound traffic in this way. Once you do this, you can write rules that filter outgoing connections based on their domain name. This effectively bypasses the 60 IP limit because you are not referring to specific IP addresses. At the same time, it simplifies management and makes rules much easier to read and understand. Instead of looking up and adding all of Github’s API IP addresses, you can write rules that reference the domain “Github.com”. If Github decides to change its IP infrastructure, your security rules will automatically reference the new addresses – you won’t have to go back and update them. The earlier you address AWS security group limits, the better There is an unlimited number of ways you can arrange your security groups and Network ACLs. Even in a small environment, the prospect may seem daunting. However, the flexibility Amazon provides to its cloud users is a valuable security feature. Those who go the process enjoy clear security performance benefits. If you start to planning for the architecture of your security and filtering policies early, you’ll be better equipped to scale those policies upwards as your organization grows. This will prevent security processes from becoming a growth bottleneck and maintain a high level of efficiency even as those policies become larger and more complex. See me explain this issue in person in my new whiteboard video: Schedule a demo Related Articles Q1 at AlgoSec: What innovations and milestones defined our start to 2026? AlgoSec Reviews Mar 19, 2023 · 2 min read 2025 in review: What innovations and milestones defined AlgoSec’s transformative year in 2025? AlgoSec Reviews Mar 19, 2023 · 2 min read Navigating Compliance in the Cloud AlgoSec Cloud Mar 19, 2023 · 2 min read Speak to one of our experts Speak to one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Schedule a call

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Since 2005 we offer the industry’s only money back guarantee If we do not meet your expectations you have the right to cancel the purchase Money-Back Guarantee At AlgoSec we are passionate about customer satisfaction. Therefore, since 2005 we have offered the industry’s only money-back-guarantee. If we do not meet your expectations you have the right to cancel your software purchase and get your money back. More importantly, you decide whether to invoke the money-back guarantee. You are the sole judge. The only condition is that you do it within a reasonable timeline. As outlined below. This way you can ensure that the AlgoSec solution works across your entire estate, not just in your lab – without assuming any financial risk. Money-Back Guarantee Terms The terms of the money-back guarantee are outlined in the table. They depend on the deal size and whether or not the product was evaluated in the customer’s lab. Note: Make sure the terms of the Money Back Guarantee are included in your project proposal. Product Deal Size Less than $300K $300K-$1M More than $1M Product Purchased
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Over 90% gross dollar retention and 37% year-over-year new business growth reflect demand for visibility across complex hybrid environments AlgoSec Posts 37% YoY new Business Growth in 2025 as Enterprises Prioritize Application-Centric Security Over 90% gross dollar retention and 37% year-over-year new business growth reflect demand for visibility across complex hybrid environments February 18, 2026 Speak to one of our experts RIDGEFIELD PARK, NJ, February 18, 2026 – AlgoSec , a global cybersecurity leader, today reported its best year ever with strong year-over-year annual recurring revenue growth, a gross dollar retention rate exceeding 90% and 37% year-over-year new business growth in 2025. The results reflect continued demand for greater visibility and control over application connectivity across hybrid and multi-cloud environments . Founded in 2004, AlgoSec has maintained positive cash flow and remained debt-free throughout its history. Enterprises faced increasing complexity throughout 2025 as application environments spanned data centers, cloud and hybrid infrastructure. That complexity was reflected in AlgoSec’s 2025 State of Network Security Report , based on insights from over 500 cloud and network security professionals globally, which found that multi-cloud environments are now the norm, with Azure emerging as the most widely used cloud platform among respondents. The report also found that automating application connectivity has become the top priority for minimizing risk and downtime as environments continue to expand. In response to these challenges, large, distributed enterprises adopted AlgoSec in 2025. New customers included Vodacom Business, NTT DATA Spain, Gainwell Technologies LLC – Texas, Lamborghini and more. AlgoSec consistently earns high satisfaction scores from real users, scoring 4.5 out of 5 on both G2 and Gartner Peer Insights , outperforming matching peers and being recognized as customer choice in Gartner’s Voice of the Customer report and #1 in PeerSpot . Additionally, AlgoSec’s 4.5 out of 5 Glassdoor rating places the company among top-tier employers. The AlgoSec Horizon platform, released in 2025, is recognized as the industry’s first application-centric security management and automation platform designed specifically for hybrid networks. The platform provides a single source of visibility across multi-clouds and data center environments, enabling security teams to prioritize risk based on business needs while managing security at scale. Through AI-driven visibility and risk mitigation that automatically discovers applications and maps connectivity dependencies, AlgoSec Horizon reduces operational friction, minimizes misconfigurations and supports faster, safer application delivery. “Today’s security teams are managing unprecedented levels of application and infrastructure complexity,” said Yuval Baron , AlgoSec CEO and co-founder. “2025 has been our best year ever. In just a few months, over 100 customers have implemented the AlgoSec Horizon platform. This rapid adoption highlights enterprises’ strategic need for a single platform to secure their hybrid estate, often spanning multiple cloud platforms and data centers. At the same time, organizations must accelerate application connectivity to speed delivery. Together, these capabilities are essential for driving growth and innovation in the AI era.” AlgoSec’s application-centric approach was also recognized by the industry in 2025 , earning the 2025 SC Award for Best Security Company from SC Media at RSAC, a Global InfoSec Award from Cyber Defense Magazine for Best Service as a Cybersecurity Company, and Trailblazer recognition in Network Security and Management from Cyber Defense Magazine’s Top InfoSec Innovator Awards. For more on AlgoSec’s 2025 achievements and innovations, visit www.algosec.com .

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AlgoSec’s new product manages network objects in firewall, SDN and cloud platforms to securely accelerate connectivity changes Finally, a single source of truth for Network Security Objects with AlgoSec Horizon ObjectFlow AlgoSec’s new product manages network objects in firewall, SDN and cloud platforms to securely accelerate connectivity changes May 18, 2022 Speak to one of our experts RIDGEFIELD PARK, N.J., May 18, 2022 – AlgoSec, a global cybersecurity leader in securing application connectivity, has announced their new product, AlgoSec Horizon ObjectFlow, a network security object management solution for hybrid environments spanning cloud networks, SDNs and on-premises. According to Rik Turner, principal analyst at Omdia “in the complex environments that ensue from modern architectures such as SDN, as well as hybrid and multi-cloud environments, there is a very real risk of overlapping objects, making both their management from a security perspective a real headache. There is clearly the potential for automation to be applied to further streamline management.”  AlgoSec Horizon ObjectFlow offers the most comprehensive visibility and control of network objects across an entire hybrid environment. As a turnkey SaaS based solution, customers can leverage Horizon ObjectFlow’s advantages within minutes upon activation.  Professor Avishai Wool, AlgoSec CTO and co-founder states that Horizon ObjectFlow addresses a dire need in the market for optimal network object management as “most enterprise networks rely on a vast number of network objects that often refer to the same addresses in various forms, creating duplications and inconsistencies that can slow down changes to network connectivity and security policies. As a result, this leads to an increased risk of misconfigurations, outages and security breaches.”  Key benefits that Horizon ObjectFlow delivers to IT, network and security experts include:   Single source of truth   Horizon ObjectFlow is a central repository of all network objects used in security policies, allowing customers to maintain consistency of definitions across the multiple management systems used by various vendors. Object discovery and complete object visibility   Horizon ObjectFlow helps enterprises tap into SDNs and firewalls to discover all the objects on a network. Unique naming conventions can be created and organized based on individual needs and from multiple vendors. Automation of object changes   Horizon ObjectFlow makes automation of object changes possible from a central location. With official vendor API Integrations, manual labor is avoided, allowing for changes to be made within minutes instead of days.  Risk reduction   Horizon ObjectFlow provides full visibility and uniformity over network objects, breaking down organizational silos. With these processes in place, objects can be easily identifiable, allowing networks to be completely secure.  “Network security objects are the bread and butter of your network security posture,” said Eran Shiff, Vice President, Product of AlgoSec. “With Horizon ObjectFlow we give organizations a simple, effective way to manage their network security objects in a centralized object management solution. It helps IT teams to secure application connectivity and reduce the time spent by the security team, increasing efficiency across the board.”  To see how AlgoSec can help you better manage your network security objects with Horizon ObjectFlow, schedule your personal demo today. About AlgoSec   AlgoSec, a global cybersecurity leader, empowers organizations to secure application connectivity by automating connectivity flows and security policy, anywhere.  The AlgoSec platform enables the world’s most complex organizations to gain visibility, reduce risk and process changes at zero-touch across the hybrid network.   AlgoSec’s patented application-centric view of the hybrid network enables business owners, application owners, and information security professionals to talk the same language, so organizations can deliver business applications faster while achieving a heightened security posture.  Over 1,800 of the world’s leading organizations trust AlgoSec to help secure their most critical workloads across public cloud, private cloud, containers, and on-premises networks, while taking advantage of almost two decades of leadership in Network Security Policy Management.  See what securely accelerating your digital transformation, move-to-cloud, infrastructure modernization, or micro-segmentation initiatives looks like at www.algosec.com     Media Contacts:  Tsippi Dach  AlgoSec  [email protected]     Jenni Livesley  Context Public Relations  [email protected]  +44(0)300 124 6100 

Proper firewall configuration is essential for a secure network Explore how to overcome challenges and learn tips for effective firewall configuration What is Firewall Monitoring? Select a size Which network Can AlgoSec be used for continuous compliance monitoring? Yes, AlgoSec supports continuous compliance monitoring. As organizations adapt their security policies to meet emerging threats and address new vulnerabilities, they must constantly verify these changes against the compliance frameworks they subscribe to. AlgoSec can generate risk assessment reports and conduct internal audits on-demand, allowing compliance officers to monitor compliance performance in real-time. Security professionals can also use AlgoSec to preview and simulate proposed changes to the organization’s security policies. This gives compliance officers a valuable degree of lead-time before planned changes impact regulatory guidelines and allows for continuous real-time monitoring. What is firewall monitoring? The importance of firewall monitoring for modern network security Key features & capabilities of firewall monitoring tools and solutions What to look for in a firewall monitoring solution? 5 Common firewall monitor challenges FAQ How does AlgoSec help with firewall monitoring? Get the latest insights from the experts Schedule time with one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

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