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Juniper’s chassis combines firewall, VPN and IPS

Dec 05, 20056 mins
Network SecurityNetworkingSecurity

Juniper plugs intrusion-prevention blades into ISG 2000 chassis with mixed results.

When Juniper shipped the Integrated Security Gateway 2000 late last year, the company said it was more than another low-density NetScreen firewall. In addition to the basic firewall and VPN capability built into the chassis, Juniper said the ISG 2000 could accommodate as many as three other blades providing security applications, such as intrusion prevention, without affecting the performance of the base firewall and VPN.

How we did it

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The blades came out in the spring, and we’ve been testing the ISG 2000 with three IDP (Juniper’s intrusion-prevention product) blades on our live network for four months, focusing on hardware, management software and architecture.

Overall, while Juniper got the architecture of the system right, it’s got some work to do in terms of maintaining hardware and management software.

Hardware: Too hard

The ISG 2000 design doesn’t fall in line with Juniper’s long-standing reputation of producing maintainable hardware. While port cards, fan modules and power supplies are easy to replace, you cannot hot-swap interface cards. Additionally, getting to the IDP blades and the management module means pulling the chassis out of the rack, unscrewing the top cover, and dealing with slots and boards that were not designed for easy maintenance.

The difficulty of maintaining this hardware was driven home in our tests when one of the blades stopped working properly. Juniper technical support was quick to diagnose the problem, but we had to pull the unit out of our network while we waited for a replacement part to arrive. Had the hardware been more maintainable, we could have quickly pulled the bad board and run on a reduced configuration.

We ran into another hardware-integration problem when we first tried to install the ISG 2000 in our network. Juniper’s ScreenOS firewall software is running at either Version 5.2 or 5.3 in all current models – except for the ISG 2000, with Version 5.0. Unfortunately, 5.0 is missing a key feature allowing for asymmetric routing needed to install the ISG 2000 at the edge of a network with multiple ISP connections. Because of the versioning issue, we had to install additional switches to work around the unsupported topology.

Software: Too soft

Management of the chassis with IDP blades installed requires Juniper’s NetScreenSecurity Manager, a client-server application for controlling the configuration of and analyzing logs from the ISG 2000. Although managing the firewall and VPN components from this application is stable, the NetScreen-Security Manager doesn’t control the IDP blade as well as the single-function management wares shipping with Juniper’s stand-alone IPS boxes.

An intrusion-prevention system (IPS) requires frequent configuration to tune, tighten and reduce false positives. Operations that should be easy to do, such as adding an IPS signature to an exception list, require a significant number of steps, take you through a series of modal configuration dialogs and can be frustratingly unpredictable. Even with Juniper on-site, we couldn’t figure out whether this unpredictable behavior was caused by bugs or some exceptionally subtle issue of how and where you click.

Simple tasks, such as finding a signature to learn more about it, are difficult to do. When we finally discovered (with the help of technical support) the well-hidden “find” function in the NetScreen-Security Manager GUI, we found a not-so-well-hidden bug: It doesn’t find things very often. We were reduced to searching and scrolling through thousands of signatures to get the information we required.

We also expected to see more by way of integrated management across modules. In places where Juniper could have shared configuration between the firewall and IDP, it didn’t. For example, although the firewall rules are used to say whether the IDP protects a stream, all details of the firewall rules are lost once you enter the IDP. If you want to customize your signatures for different firewall rules, you have to recreate the rules before you can pick and choose the signatures that apply.

In all, we went through three released versions of the management software during our four-month test. It’s hard to tell whether the problems we ran into with NetScreen-Security Manager are the result of a rushed design, or just a buggy user interface that didn’t work very well. In either case, Juniper doesn’t meet its own standards for intrusion-prevention management tools with this release of the ISG 2000.

Architecture: Just right

If hardware and management software are the twin Achilles’ heels of the ISG 2000, Juniper gets extra credit for getting the hardest part right: the architecture. Merging a firewall and an IPS is not easy. We’ve seen products from a half-dozen vendors go through our labs with the dual moniker of firewall and IPS, and most of them were so badly integrated that the IPS function might as well have been disabled. Not so with the ISG 2000. Juniper has done a good job of merging the two functions into a single system and giving the security manager sufficient control to make it all work – without putting so many knobs on the system that managing it is disproportionately burdensome.

Our months of letting the ISG 2000 protect our network ahead of all our other firewalls gave us hard-to-measure benefits. With any IPS, it’s hard to say what didn’t happen to you because you had an IPS in place. We had millions of attack events blocked, but it’s impossible to say how many infections we didn’t get because the IPS was in place. We were able to use the alerting system on the ISG 2000 to show us systems inside our networks already infected with spyware. Because the ISG 2000 was upstream of – and beefier than – all our other firewalls, it dramatically reduced the events coming from those firewalls, but that was also expected behavior.

The ISG 2000 is like a mostly baked cake (or to the turophile, an underaged Parmesan). If Juniper fixes the management system, this product will be a valuable addition to any network. At this stage, the ISG 2000 will appeal to those die-hards who are familiar with Juniper’s IDP product line and are eager to better integrate their firewall and IPS functionality into a single system and single management console.

Snyder is a senior partner at Opus One in Tucson, Ariz. He can be reached at

Snyder is also a member of the Network World Lab Alliance, a cooperative of the premier reviewers in the network industry, each bringing to bear years of practical experience on every review. For more Lab Alliance information, including what it takes to become a member, go to