"Cutter" is a utility that allows administrators of linux firewalls based on "netfilter/iptables" to close specific TCP/IP connections routed over them.
Possible applications for this included .. Closing SSH tunnels or VPNs left running over night, closing heavy FTP downloads when bandwidth is at a premium, aborting hacker attacks on DMZ servers -- etc.
Cutter works by sending an "RST" packet to both ends of a TCP/IP connection, causing them to abort the conversation. It uses netfilter's "conntrack" mechanism, linux routing and arp tabes and linux "packet" sockets to do this.
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