25 Most Frequently Used Linux IPTables Rules

Hungary Ericsson Lab

1. Delete Existing Rules Before you start building new set of rules, you might want to clean-up all the default rules, and existing rules. iptables -F (or) iptables –flush 2. Set Default Chain Policies The default chain policy is ACCEPT. Change this to DROP for all INPUT, FORWARD, and OUTPUT chains iptables -P INPUT DROP […]

Email Spoofing

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Have you ever gotten an email that appeared to be from a friend or colleague (or even worse, from yourself) but the subject and text were obviously not something that he or she would send? Or have you ever gotten an undeliverable email notice for an email that you never sent out? Both of these […]