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Hi (check)mates,
We all know that "the firewall" is one of the first things people blame when there is a traffic issue. A security gateway (a "firewall") do a lot of "intelligent stuff" more than just routing traffic (and -in fact- many network devices today do also "a lot of things") so I understand there is a good reason for thinking about the firewall but, at the same time, there is a big number of times where it's not anything related to it, or when it's not directly related.
I'm looking to build a brief list of typical or somewhat frequent issues we face, where "the firewall" is reported as the root of the issue, but finally it isn't.
It's a quite generic topic, and in terms of troubleshooting it's probably even more generic. Probably there are several simple tools that one should use first, like: traffic logs, fw monitor, tcpdump/cppcap, etcetera. But what I would like to point is not the troubleshooting, but the issues themselves. Of course, assuming the firewall side is properly configured (which would be a "firewall issue" but due to a bad configuration).
To narrow down the circle, I'm specially focusing on networking issues, but every idea is welcomed.
Do you think it would be useful to elaborate such list? 🙂 What issues do you usually find?
Something to start
(I'll update this list with new suggested issues):
Lastly, a little humor. 😊
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