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Enough with “firewalls”
A mythical conversation on firewalls, and some observations
“Let’s put the firewall here, so it can protect the servers in this part of the network.”
“How would you define a firewall?”
“You know, the appliance that, well, protects servers and other machines from outside threats…”
“And how does it do this?”
“By filtering the traffic using some sort of stateful mechanism, and network address translation, and deep packet inspection, and blocking certain ports, and…”
“In other words, it’s a bunch of services on a single device?”
“Yes…”
“Then maybe we should think in terms of services instead of appliances.”
I’ve never actually had this conversation, but I’ve had many similar ones across my times as a network engineer. I’ll admit, in fact, that it took a lot of conversations like this (with me on the receiving end) to grock the difference between a service and an appliance, and to see that my constant thinking in terms of appliances (or even devices) was actually hindering my ability to design networks. Let me give you two specific reasons you should think of security services, instead of security appliances.
First, When you disaggregate the “things a firewall Continue reading
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