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firewall

Network security systems that monitor and control incoming and outgoing network traffic

Networkingiptables NAT Rule Check: Why -C Command Fails

Learn why iptables -C command fails to recognize NAT rules and how to properly verify iptables NAT rules using the correct syntax with -t nat option.

1 answer• 2 views
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.

1 answer• 1 view
NetworkingFix MikroTik /25 Subnet Routing Ping Issue Between Sites

Troubleshoot MikroTik routing issue with ISP /25 subnet: can't ping between public IPs despite external access working. Enable proxy ARP, check ARP tables, routes, and firewall for MikroTik ping fixes.

1 answer• 1 view