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On Linux, I've been building a malicious IP list. I assume the DDOS is now gone. How do I drop the entire INPUT chain from iptables, without affecting the FORWARD or OUTPUT chains?

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iptables -F optionally takes the chain to flush.

iptables -F INPUT

But you should consider making a separate chain in case you ever legitimately need filtering in INPUT.

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I tried iptables -F INPUT on a RackSpace cloud node and it froze the server. I had to reboot. Not recommended. I need to find a way to not affect their rules -- only mine. –  Volomike May 17 '13 at 13:00
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That's why you use a separate chain for this. –  Ignacio Vazquez-Abrams May 17 '13 at 13:01
    
Can you show me how to add a separate INPUT chain so that I can flush just that chain later on? –  Volomike May 17 '13 at 13:16
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@Volomike: -N will create a new chain. Simply add a rule at/near the end of INPUT that jumps to this chain. –  Ignacio Vazquez-Abrams May 17 '13 at 13:25
    
you could also manually edit the config file. /etc/sysconfig/iptables I believe and then restart the service.... Just don't mess up syntax wise, especially if your remote connecting. –  hwshadow May 18 '13 at 8:21

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