Rules: Extended Targets REJECT: Polite form of DROP Throws ICMP at hosts to indicate that a DROP occured. TCPMSS: TCP/IP MSS Clamping Useful for ADSL and other 'odd' connections. MARK: FW Mark packets Used to mark packets for QoS or Policy Routing Can be used with the mark test to simplify complex rulesets. MIRROR: Swap Source/Destination IP LOG: Log Packets to klog replaces ipchains' -l flag SNAT: Source NAT DNAT: Destination NAT MASQUERADE: Special Source NAT