I'm in the process of testing out some new firewall solutions. As background, I had a CCNA years ago, until it expired. In my day to day job, I don't deal with networking issues nearly as often as I used to, being that 5 or 6 years ago I configured Cisco equipment quite often, but now not so much, so I'm definitely rusty.
So in OPNSense, after I created a VLAN, I had to add a firewall rule for the VLAN with the source direction IN allowed to any. Why would the direction not be OUT? I'm having trouble wrapping my head around it and I haven't been able to find any good explanations.
Can someone explain this to me like I'm five?
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