Planned Multi-Cloud Security: Leasing Firewalls at Cloud Interconnect Hubs

So here I am sitting at my desk, third coffee kicking in, thinking about the ever-growing beast that is multi-cloud security. Playing since 1993, when I got into the industry as a network admin toggling muxes to route voice and data over the PSTN (ah, the memories), wrestling the Slammer worm back in the early 2000s and miraculously managed to start my own security outfit today. Fresh back from DefCon, high on hardware hacking village, still quivering from the blend of old-school hacks and new-school threats. But let me seem to them to shoot straight — there’s nothing more important these days than locking those multi-cloud interconnects down, particularly when AWS, Azure and GCP begin talking to one another.

And here’s the thing. What enterprises really need is to safely stitch their clouds together. The rental of next-generation firewalls (NGFWs) co-located at cloud interconnect hubs has been a game changer. We’re not talking about some shoddy virtual firewall bunged onto a VM somewhere. Nope. I mean purpose-built hardware firewalls — like 100Gbps on the edge, physically sitting in the colocation center where your clouds collide, planting a stake in the ground and saying, Not on my watch.

This post explains what’s really involved in leasing a multi-cloud firewall for cloud interconnect hubs —from the downside of hybrid setups up to the nitty-gritty of leasing, setting specs, automation, and, yes, billing headaches. Buckle up.

Hybrid & Multi-Cloud Risks

Once upon a time, your network perimeter was well defined — a physical barrier, like a picket fence, a gate and a really good firewall, and some pretty strong intrusion prevention. Now? It’s a jungle: untenable, undulating and ever-changing.

When you’re combining AWS, Azure and GCP, you’re essentially Frankensteining three very different architectures, security models, and traffic flows.

Here’s why it’s risky:

• Mismatched auth flows: what’s allowed on AWS may not be allowed on Azure (and the other way around).
• Network segmentation gets hazy: west to east traffic between clouds might skip over controls (if you are solely usingh cloud native firewalls).
• Data exfiltration risk: with no strong choke point, a hacked VM in one cloud can silently ship data out.
• Compliance nightmares: GDPR! HIPAA! All stipulate such tight controls.

One of my recent contracts was supporting the transition to zero-trust for three banks for places where multi-cloud edge met the ground. Banks. You don’t screw around with their data.

And guess what? It was the bulletproof move to rent this shit colocated right off their interconnect HUDs — because those firewalls:

• Live right on the spot where clouds gather.
• Say hello to all moving stuff between clouds.
• Put an end to lateral movement and rogue traffic.

Anecdote: I had a client who attempted to use native cloud rules to inspect multi-cloud traffic. Ended with a compromise that was eventuated to be overlooked peerings. Happens more than you think.

Quick Take — Risks Summary

• Cloud-native firewalls are not well-suited to protect cross-cloud east-west traffic
• Hybrid IT extends attack surface
• NGFW on dedicated interconnect hubs for more thorough inspection
• Zero trust relies heavily on these chokepoints

Colocation Rental Logistics

Although renting firewalls is not simply a matter of dropping a box into a data center and forgetting about it. No siree.

Colocation centers (especially the centers that host these cloud interconnect hubs) are expensive, and their contracts are meant to keep you where you are. But here’s the kicker: Renting hardware firewalls right where your clouds connect cuts latency, increases security and sometimes even beats the cost of spinning up virtual firewalls in several clouds.

Here is what I have observed to be effective for my clients:

• Pick a colo location with direct fiber to AWS, Azure, GCP (e.g. Equinix, Digital Realty).
• Work out rental terms with some flexibility on your part. Leases should be a minimum of one year, but do your best to keep them shorter so that you are more adaptable.
• Budgeting for power, cooling and physical security.
• Do it live – for hands-on deployment – Managed rental NGFW vendors will offer remote hands, but ensure clear SLAs.

The banks I worked with had audit-ready colos, physical access controls and tamper-proof hardware enclosures — no surprises there.

Remember — these firewalls aren’t plug and forget. Physical access, or at least remote management, are required for regular firmware updates, policy tuning and incident response testing.

Oh, and don’t commit too much on ports and bandwidth from the start. Begin with what you need, but grow quickly. Multi-cloud traffic is notoriously unpredictable.

High-Throughput Specs

This is where I get a little geeky — and perhaps a little opinionated.

Multi-cloud interconnect firewalls need to be loud like a V8 engine when your traffic peaks. By that, I mean support for at least 100 Gbps of throughput — and plenty of clients are achieving that between clouds at peak demand.

Specs that matter:

• Throughput: minimum 100 Gbps, layer 7 deeper inspection without drops
• Concurrent sessions: many millions, because connectivity bursting into %onds and overflows I said so, do it decade ago, still more than enough even at 3pm when you need to process+code+attend some conference.
• Latency : sub-millisecond to keep your apps humming along
• Threat intel integrated: sigs, sandbox, etc.

Today’s Next-Generation Firewalls employ either ASIC (Application Specific Integrated Circuit) acceleration or Hybrid processing. This is critical. Software-only firewalls in VMs (don’t get me wrong, I’m a huge fan of cloud-native, but…) just can’t operate at those speeds and safely.

Remember Slammer? That worm overwhelmed networks because the defense gear was sluggish. Don’t make the same mistakes with virtual firewalls.

If you are considering going fully virtual just because it’s a bad time to get an office lease, you might want to think again, I say. For edge high-throughput security, hardware is still king.

And the multi-cloud edge was just such a battleground where the firewall is your best pit crew:

• Fast
• Reliable
• Ready to snap up any anomalies

Automation & APIs

But what’s the point of a beastly rented firewall if you can’t manage it easily? My rule of thumb: automa- tion or die.

I recently helped a few of those banks with a zero-trust upgrade — editing hundreds of firewall rules, bringing policies into sync across multi-cloud, multi-device systems. Manual changes? Unthinkable.

The best NGFW rental service have strong APIs available. Why does this matter?

• Automate policy deployments
• Connect to SIEM, SOAR for alert and response
• Continuous compliance reporting
• Quick incident quarantines and segmentations modifications

I like to think of it like cooking a complicated dish — if you’re trying to chop all of the ingredients by hand while the pot is boiling over, you’re going to make a mess of things. Automation is the prep station, the sous chef.

A few tips:

• Look at API versioning and quality of documentation ahead of time
• Require that API be controlled with role-based access controls
• Test automated scripts in staging before pushing it to prod.

Oh, and a rant of my own: Don’t believe any AI-powered firewall management hype just yet. AI is terrific, but when it comes to firewall rule deployment, your automation scripts are the real wizard.

Billing Alignment

Finally—the money talk.

It’s not cheap to rent NGFWs in multi-cloud co-los. But there is a silver lining: correlating billing models with cloud spend appears to have a value that matters a great deal to finance departments.

What works:

• Extrapolating for monthly rent over Capex. Clouds, they taught us that OpEx is king, don’t they?
• Bandwidth and security services metering and billing with time in: Securing Bandwidth new Added support for Active directory based Cross promotion security services up to 1M concurrent users.
• Tiers for usage that can scale with traffic bursts (yes, some firewalls can do this!)
• Authorize consolidated billing with cloud providers where this is possible (a few rental partners already do this)

To my experience of the banks, budgeting came between the ITsecurity and network teams. Transparency in billing — and being able to show savings about data that has been compromised — had everybody grinning.

A big mistake? Ignoring hidden costs:

• Power and cooling within colo
• Not a support / managed service charge
• Addons Available for API or Software License

Ensure all parties have the full picture — otherwise, you’ll get surprises when a bill arrives.

Wrapping Up

So yeah—multi-cloud firewall rental at colocation interconnect hubs isn’t just for niche use cases now. It is becoming mandatory for organizations that are serious about securing hybrid cloud sprawl.

It’s the equivalent of renting a high-performance sports car for your data highway instead of driving the old family sedan. You have the speed, control and reliability required when traffic is heavy and security must be guaranteed.

Remember:

• Hybrid, multi-cloud mixes just extend your attack surface—dedicated physical NGFWs at the interconnect can help cut that risk.
• Lease hardware within colos near cloud endpoints to lower latency and also provide a physical control.
• High-throughput specs and ASIC acceleration are more important than ever.
• It can all be OK, but APIs and automation are crucial to keeping it manageable and scalable.
• Match billing models to cloud spend and anticipate transparent costs.

If you’re adopting multi-cloud architectures, don’t half-ass your edge security. Done it, been there, got the old scars (and war stories) — my advice? Rent the best firewall you can, set yourself up physically near your cloud interconnects with connectors, and automate the ever loving shit out of your polices.

And please, please, for the love of all that’s secure—can we not learn something from the PSTN days or Slammer worm years. The attack surface may be different, but the fundamentals haven’t changed: vigiliance, speed and the ability to call up one hell of a firewall.

Done rambling. Time for a fourth coffee. Cheers,

Sanjay Seth
P J Networks Pvt Ltd
Cybersecurity Consultant rapesince the days of dial-up