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Cisco Content Services Gateway - 2nd Generation Release 2.0 Installation and Configuration Guide
OL-15491-01
Appendix A CSG2 Command Reference
subscriber-ip http-header forwarded-for
To prevent exposure of potentially sensitive IP addresses, the CSG2 can obscure the contents of
X-Forwarded-For headers, overwriting the contents with blanks.
• If you want to obscure the contents of the X-Forwarded-For header, enter the subscriber-ip
http-header x-forwarded-for command with the obscure keyword.
• If you do not want to obscure the contents of the X-Forwarded-For header, enter the subscriber-ip
http-header x-forwarded-for command without the obscure keyword (the default setting).
• When obscuring the IP address in X-Forwarded-For headers, keep the following considerations in
mind:
–
The CSG2 does not obscure the IP address in fragmented request packets that have
X-Forwarded-For headers, because the CSG2 does not reassemble the fragments and therefore
cannot modify the packets.
–
The CSG2 does not obscure the X-Forwarded-For header for traffic that is downgraded from
Layer 7 inspection to Layer 4 inspection.
–
If the active CSG2 fails over to the standby CSG2, the standby CSG2 does not obscure the IP
address in X-Forwarded-For header for existing HTTP sessions. However, the standby CSG2
does obscure the IP address in X-Forwarded-For headers for new HTTP sessions.
–
If the subscriber sends more than one GET request with X-Forwarded-For headers, and the
content host fails to send a TCP acknowledgement within five seconds, the CSG2 resets the
subscriber side connection.
Examples The following example configures the CSG2 to obtain the subscriber's IP address from the HTTP
X-Forwarded-For header, and obscures the IP address in the X-Forwarded-For header:
ip csg content MOVIES
parse protocol http
subscriber-ip http-header x-forwarded-for obscure
Related Commands Command Description
ip csg content Configures content for CSG2 services, and enters CSG2 content
configuration mode.
ip csg mode single-tp Enables the CSG2 to use a single TP instead of multiple TPs.
parse length Defines the maximum number of Layer 7 bytes that the CSG2 is to parse when
attempting to assign a policy.
parse protocol Defines how the CSG2 is to parse traffic for a content.