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SonicOS Enhanced 4.0 Administrator Guide
CHAPTER 41
Chapter 41: Configuring TCP Settings

Firewall > TCP Settings

The TCP Settings lets you view statistics on TCP Traffic through the security appliance and
manage TCP traffic settings. The page is divided into three sections
• TCP Traffic Statistics
• TCP Settings
• SYN/RST/FIN Flood Protection

TCP Traffic Statistics

The TCP Traffic Statistics table provides statistics on the following:
• Connections Opened – Incremented when a TCP connection initiator sends a SYN, or a
TCP connection responder receives a SYN.
• Connections Closed – Incremented when a TCP connection is closed when both the
initiator and the responder have sent a FIN and received an ACK.
• Connections Refused – Incremented when a RST is encountered, and the responder is in
a SYN_RCVD state.
• Connections Aborted – Incremented when a RST is encountered, and the responder is in
some state other than SYN_RCVD.
• Total TCP Packets – Incremented with every processed TCP packet.
• Validated Packets Passed – Incremented under the following conditions:
–
When a TCP packet passes checksum validation (while TCP checksum validation is
enabled).
–
When a valid SYN packet is encountered (while SYN Flood protection is enabled).
–
When a SYN Cookie is successfully validated on a packet with the ACK flag set (while
SYN Flood protection is enabled).
• Corrupted Packets Dropped - Incremented under the following conditions:
–
When TCP checksum fails validation (while TCP checksum validation is enabled).