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this post was submitted on 11 Oct 2023
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Ya it’s me I’m the guy in IT who is currently confusing a subnet mask for my own ass.
Just think of it as a routing optimisation that is only relevant for ipv4 networks.
Router simple, router need to make decisions quick, quickest decision is made when can smush the subnet mask against an IP address and determine if the computer is on a local network so router can send traffic direct or is on other network so router needs to send traffic to other router