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  • Arthur Burkart thinks this is interesting:

there would be absolutely no need for firewalls.

From

Cover of How to Cheat at Managing Information Security

Note

I'm not sure this is an entirely true statement, since a firewall can serve as an optimized external service for blocking CIDRs. Without the firewall, a high-demand, HTTP service–for example–that would otherwise sit behind it has to devote extra CPU cycles to blocking IPs, which could decrease the number of requests it can handle.