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B-24
Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
Appendix B Signature Engines
Atomic Engine
specify-tcp-mask {yes | no} (Optional) Enables the TCP mask for use:
• tcp-mask—Specifies the mask used in
TCP flags comparison:
–
URG bit
–
ACK bit
–
PSH bit
–
RST bit
–
SYN bit
–
FIN bit
urg
ack
psh
rst
syn
fin
specify-tcp-flags {yes | no} (Optional) Enables TCP flags for use:
• tcp-flags—Specifies the TCP flags to
match when masked by mask:
–
URG bit
–
ACK bit
–
PSH bit
–
RST bit
–
SYN bit
–
FIN bit
urg
ack
psh
rst
syn
fin
specify-tcp-reserved {yes | no} (Optional) Enables TCP reserved for use:
• tcp-reserved—Specifies the value of TCP
reserved.
0 to 63
specify-tcp-header-length {yes
| no}
(Optional) Enables inspection of the Layer 4
TCP header length:
• tcp-header-length—Specifies the length
of the TCP header used in inspection.
0 to 60
specify-tcp-payload-length
{yes | no}
(Optional) Enables inspection of the Layer 4
TCP payload length:
• tcp-payload-length—Specifies the length
of the TCP payload.
0 to 65535
specify-tcp-urg-pointer {yes |
no}
(Optional) Enables inspection of the Layer 4
TCP URG pointer:
• tcp-urg-pointer—Specifies the value of
the TCP URG flag inspection.
0 to 65535
specify-tcp-window-size {yes |
no}
(Optional) Enables inspection of the Layer 4
TCP window size:
• tcp-window-size—Specifies the window
size of the TCP packet.
0 to 65535
Table B-8 Atomic IP Advanced Engine Parameters (continued)
Parameter Description Value