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Network Security Gateway Evolution [New Series]

By Mike Rothman

(Note: We’re restarting this series over the next week, so we are reposting the intro to get things moving again. – Mike )

When is a firewall not a firewall? I am not being cute – that is a serious question. The devices that masquerade as firewalls today provide much more than just an access control on the edge of your network(s). Some of our influential analyst friends dubbed the category next generation firewall (NGFW), but that criminally undersells the capabilities of these devices.

The “killer app” for NGFW remains enforcement of security policies by application (and even functions within applications), rather than merely by ports and protocols. This technology has matured since we last covered the enterprise firewall space in Understanding and Selecting an Enterprise Firewall. Virtually all firewall devices being deployed now (except very low-end gear) have the ability to enforce application-level policies in some way. But, as with most new technologies, having new functionality doesn’t mean the capabilities are being used well. Taking full advantage of application-aware policies requires a different way of thinking about network security, which will take time for the market to adapt to.

At the same time many network security vendors continue to integrate their previously separate FW and IPS devices into common architectures/platforms. They have also combined network-based malware detection and some light identity and content filtering/protection features. If this sounds like UTM, that shouldn’t be surprising – the product categories (UTM and NGFW) provide very similar functionality, just handled differently under the hood.

Given this long-awaited consolidation, we see rapid evolution in the network security market. Besides additional capabilities integrated into NGFW devices, we also see larger chassis-based models, smaller branch office devices, and even virtualized and cloud-based configurations to extend these capabilities to every point in the network. Improved threat intelligence integration is also available to block current threats.

Now is a good time to revisit our research from a couple years ago. The drivers for selection and procurement have changed since our last look at the field. But, as mentioned above, these devices are much more than firewalls. So we use the horribly pedestrian Network Security Gateway moniker to describe what network security devices look like moving forward. We are pleased to launch the Network Security Gateway Evolution series, describing how to most effectively use the devices for the big 3 network security functions: access control (FW), threat prevention (IPS), and malware detection.

Given the forward-looking nature of our research, we will dig into a few additional use cases we are seeing – including data center segmentation, branch office protection, and protecting those pesky private/public cloud environments.

As always, we develop our research using our Totally Transparent Research methodology, ensuring no hidden influence on the research.

The Path to NG

Before we jump into how the NSG is evolving, we need to pay our respects to where it has been. The initial use case for NGFW was sitting next to an older port/protocol firewall and providing visibility int which applications are being used, and by whom. Those reports showing, in gory detail, all the nonsense employees get up to on the corporate network (much of it using corporate devices) at the end of the product test, tend to be quite pretty enlightening for the network security team and executives.

Once your organization saw the light with real network activity, you couldn’t unsee it. So you needed to take action, enforcing policies on those applications. This action leveraged capabilities such as blocking email access via a webmail interface, detecting and stopping file uploads to Dropbox, and detecting/preventing Facebook photo uploads. It all sounds a bit trivial nowadays, but a few years ago organizations had real trouble enforcing this kind of policies on web traffic.

Once the devices were enforcing policy-based control over application traffic, and then matured to offer feature parity with existing devices in areas like VPN and NAT, we started to see significant migration. Some of the existing network security vendors couldn’t keep up with these NGFW competitive threats, so we have seen a dramatic shift in the enterprise market share over the past few years, creating a catalyst for multi-billion M&A.

The next step has been the move from NGFW to NSG through adding non-FW capabilities such as threat prevention. Yes, that means not only enforcement of positive policies (access control), but also detecting attacks like a network intrusion prevention device (IPS) works. The first versions of these integrated devices could not compare to a ‘real’ (standalone) IPS, but as time marches on we expect NSGs to reach feature parity for threat prevention. Likewise, these gateways are increasingly integrating detection malware files as they enter the network, in order to provide additional value.

Finally, some companies couldn’t replace their existing firewalls (typically for budget or political reasons), but had more flexibility to replace their web filters. Given the ability of NSGs to enforce policies on web applications, block bad URLs, and even detect malware, standalone web filters took a hit. As with IPS, NSGs do not yet provide full feature parity with standalone web filters yet. But many companies don’t need the differentiating features of a dedicated web filter – making an NSG a good fit.

The Need for Speed

We have shown how NSGs have and will continue to integrate more and more functionality. Enforcing all these policies at wire speed requires increasing compute power. And it’s not like networks are slowing down. So first-generation NGFW reached scaling constraints pretty quickly. Vendors continue to invest in bigger iron, including more capable chassis and better distributed policy management, to satisfy scalability requirements.

As networks continue to get faster, will the devices be able to keep pace, retaining all their capabilities on a single device? And do you even need to run all your stuff on the same device? Not necessarily. This raises an architectural question we will consider later in the series. Just because you can run all these capabilities on the same device, doesn’t mean you should…

Alternatively you can run a NSG in “firewall” mode, just enforcing basic access control policies. Or you can deploy another NSG in “threat prevention” mode, looking for attacks. Does that sound like your existing architecture? Of course – and there is value in separating functions, depending on the scale of the environment. More important is the ability to manage all these policies from a single console, and to change the box’s capabilities through software, without needing a forklift.

Graceful Migration

We will also cover how you can actually migrate to this evolved network security platform. Budgets aren’t unlimited, so unless your existing network security vendor isn’t keeping pace (there are a few of those), your hand may not be forced into immediate migration. That gives you time to figure out the best timing to introduce these new capabilities. We will wrap up this series by with a process for figuring out how and when to introduce these new capabilities, deployment architectures, and how to select your key vendor.

The next post will dig into the firewall features of NSG, and how they continue to evolve, and why it matters to you.

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