Emre Oksum eoksum
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| ### 1: Drop invalid packets ### | |
| /sbin/iptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP | |
| ### 2: Drop TCP packets that are new and are not SYN ### | |
| /sbin/iptables -t mangle -A PREROUTING -p tcp ! --syn -m conntrack --ctstate NEW -j DROP | |
| ### 3: Drop SYN packets with suspicious MSS value ### | |
| /sbin/iptables -t mangle -A PREROUTING -p tcp -m conntrack --ctstate NEW -m tcpmss ! --mss 536:65535 -j DROP | |
| ### 4: Block packets with bogus TCP flags ### |