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nftables

Successor to iptables for netfilter

NetworkingIptables: Drop wg0 Packets Except UDP 51821 (ACCEPT vs Negate)

Master iptables rules for WireGuard wg0: drop all incoming packets except UDP port 51821. Why ACCEPT+DROP beats single negated rule. Avoid pitfalls like negation logic, rule ordering, connection tracking, INPUT vs FORWARD chains.

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