Cisco Cisco IOS Software Release 12.2(15)ZN 릴리즈 노트

CSCei62762

Symptoms: Router may generate and/or forward crafted IP packets with the source IP address being 
the routers tunnel interface for GRE or mGRE tunnels. Incorrect packet decoding may be seen with 
“debug tunnel.”

Conditions: The router needs to receive a specially crafted GRE packet sent to the tunnel end-point. 
The outer IP packet must come from the configured tunnel source and be sent to the configured 
tunnel destination IP address Present Routed bit must be set to 1. 

Workaround: Upgrade Cisco IOS to a version containing fixes for: CSCuk27655 or CSCea22552 or 
CSCei62762.

Further information: On the 6th September 2006, Phenoelit Group posted an advisory: 

* Cisco Systems IOS GRE decapsulation fault

Cisco’s statement and further information are available on the Cisco public website at:

CSCuk27655

GRE implementation of Cisco IOS is compliant with RFC2784 and RFC2890 and backward 
compatible with RFC1701.

The following sections describe the documentation available for the Cisco 1700 series routers. Typically, 
these documents consist of hardware and software installation guides, Cisco IOS configuration and 
command references, system error messages, feature modules, and other documents. Documentation is 
available as printed manuals or electronic documents, except for feature modules, which are available 
online on Cisco.com and the Documentation CD.

Use these release notes with the documents listed in the following sections:

The following documents are specific to Release 12.2 and apply to Release 12.2(15)ZN. They are 
located on Cisco.com and the Documentation CD (under the heading Service & Support):

To reach the 

, click this path:

:

:

 Release 12.2

:

 Release Notes

: Cisco IOS

 

To reach product bulletins, field notices, and other release-specific documents, click this path:

:

 Product Bulletins

To reach the 

 and 

documents, which contain caveats applicable to all platforms for all maintenance releases of 
Release 12.2, click this path:

:

:

 Release 12.2

:

 Caveats