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Can we create a network ad blocker
Running a constant arp poisoning attack on a whole network trying to mitm the dns server just to block ads is going to be unreliable as hell, and it'll screw with more than just dns traffic.
If you control the network, it's far simpler and more reliable to point clients to a dns server that blocks ads. And if you don't control the network, probably shouldn't be attacking it this chaotically.