Qtech QSW-3300-28F-AC-AC [503/693] Dos control l4port

Qtech QSW-3300-28F-AC-AC [503/693] Dos control l4port
Denial of Service Commands
Software User Manual
CLI Command Reference
Page 520
dos-control tcpfrag
This command enables TCP Fragment Denial of Service protection. If the mode is enabled, Denial of Service
prevention is active for this type of attack and packets that have a TCP payload in which the IP payload length
minus the IP header size is less than the minimum allowed TCP header size are dropped.
no dos-control tcpfrag
This command disables TCP Fragment Denial of Service protection.
dos-control tcpflag
This command enables TCP Flag Denial of Service protections. If the mode is enabled, Denial of Service
prevention is active for this type of attacks. If packets ingress having TCP Flag SYN set and a source port less
than 1024 or having TCP Control Flags set to 0 and TCP Sequence Number set to 0 or having TCP Flags FIN,
URG, and PSH set and TCP Sequence Number set to 0 or having TCP Flags SYN and FIN both set, the packets
will be dropped if the mode is enabled.
no dos-control tcpflag
This command sets disables TCP Flag Denial of Service protections.
dos-control l4port
This command enables L4 Port Denial of Service protections. If the mode is enabled, Denial of Service
prevention is active for this type of attack. If packets ingress having Source TCP/UDP Port Number equal to
Destination TCP/UDP Port Number, the packets will be dropped if the mode is enabled.
Default disabled
Format
dos-control tcpfrag
Mode Global Config
Format
no dos-control tcpfrag
Mode Global Config
Default disabled
Format
dos-control tcpflag
Mode Global Config
Format
no dos-control tcpflag
Mode Global Config
Note: Some applications mirror source and destination L4 ports - RIP for example uses 520 for both.
If you enable dos-control l4port, applications such as RIP may experience packet loss which would
render the application inoperable.

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