@Jimmy9008 said in Dell N2048 Switch and IP ACL - I just killed part of my network...:
Yes, I see what you mean. I was being crass about the windows server. Perhaps for specific servers the ACL on the switch would be useful for an added layer, but will have a think.
It's certainly an extra layer. But a complicated one (not just today, this will be complicated to support for forever) but it is one that is fully redundant with a more power and flexible one that you should be trusting pretty strongly (or removing that vendor.) I'm pretty confident that the Windows firewall has never been breached, ever. Having the switch ACLs would add a risk that someone might not enable the Windows firewall, as well. But at a minimum, it will take you to triple firewalls and all kinds of network overhead for simple stuff.
To put it another way, hospitals, government or Wall St. banks would never consider this degree of network lockdown. Unless you have a need for security greatly exceeding things like the CIA or sovereign funds, don't do this 😉
Also, anywhere that needs security even a fraction of this level can never run their own network but would have to move to Amazon (where they actually do this) and would not run Windows.
Otherwise, the level of effort here is disproportionate to the rest of the environment.