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I am using Slackware 10.2 and was playing around with my iptables rules file and noticed that even if I enter only one rule in my rules file - iptables -A INPUT -j DROP - I notice that when the PC boots it is still able to get a DHCP IP from my router. I created a rc.firewall file in the etc/rc.d folder so the rules are implemented when I boot.
I may be missing something here but I thought if I had only the above rule in my rules file, even DHCP requests would be blocked when the PC boots. Can anyone shed any light on this for me??