Distributed Firewalls: How Badly Do You Want To Fail?

Today we will talk about ccie security.

Are you ever asked to utilize a layer-2 Data Center Interconnect to employ distributed active-active firewalls, supposedly solving all the L3 issues and also asymmetrical traffic flow over stateful firewalls issues? Don't be surprised; for example, a year back I was foolish enough to draw the following diagram illustrating an example use of VPLS services, check this at ccie security lab.

The solution looks ideal: both WAN routers would advertise the same IP prefix to the outside world, draw in the customer traffic and pass the traffic through the nearest firewall. The inside routers would take care of proper traffic distribution and the return traffic would follow the quickest path towards the WAN cloud. The active-active firewalls would exchange flow data, solving the asymmetrical flow issues.

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Now ask yourself: what happens when the DCI link fails? Some of the inbound traffic will arrive to the wrong edge router and get dropped, and the firewalls will go into split-brain mode. You'll undoubtedly encounter problems in both data centers.

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Normally we use pairs of devices in redundant configurations to improve the entire system availability. I am no expert in high availability calculations, but one of the hidden assumptions in designs where devices have to exchange state information is that the non-redundant component must be as reliable as the devices by themselves.

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CCIE security workbook:In a stretched subnet design the weakest link of the entire system is the data center interconnect; in many instances, stretched subnets would minimize the overall availability of the system.

A reliable layer-3 solution is not much simpler to design. Awhile ago I was engaged in a redesign of a global network. The customer had very knowledgeable networking team and we tried hard to find a redundant data center design that would enable them to advertise a single L3 prefix from both data centers. We even got to the point where we had a working design that would survive all kinds of failures, but it got too complex for the customer.

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Unless you believe in the miracles of TCP-based anycasting, it seems the best choice you have to implement distributed data centers is still the time-proven design used by web content providers with excellent track record like Google: DNS-based load balancing between data centers along with data-center-specific summary-as-a-backup prefix advertising into BGP.

Distributed Firewalls: How Badly Do You Want To Fail?
Are you ever asked to make use of a layer-2 Data Center Interconnect to apply distributed active-active firewalls, supposedly solving all the L3 issues as well as asymmetrical traffic flow over stateful firewalls troubles?

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Distributed Firewalls: How Badly Do You Want To Fail?

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