While I was troubleshooting session disconnects and had to capture traffic on my PC, I discovered that in addition to the disconnects, there were CRC errors on the IP packets. Further checking with Cisco's help showed that this condition was present on my two test PCs, one Windows Vista and one Windows 7. When we tested a Window XP we found no CRC errors in the frames.
The Cisco TAC engineer and I checked every single switch port and trunk-port involved in the path between my two VLANs that were traversed and the router ports as well. No input errors, no CRC errors, at all.
Even packets to the text Windows XP, which is in the same subnet as the Vista and 7 machines show the errors.
Please see attached screen capture of the wireshark net capture. The error occurs on every packet sourced from the Vista computer (10.20.0.95)
If you have any idea or there is a know IP condition in Windows Vista and Windows 7, I'd like to know if there is a workaround or solution to this.
This problem is not the cause of my session disconnects.