I can confirm that you cannot connect to the FMS with a bridged connection and another computer hanging off of it. As soon as the FMS system detects more than one computer attached to the field, they cut you off from field management. That being said, someone might try disabling ICMP on the attached laptop and/or firewalling off everything except the needed ports for dashboard data and video.
If that doesn't work, you will need to either write or find some software to read packets off the field interface and resend them on the USB ethernet interface. The only other option is turning the Classmate into a router, which is trivial and requires no extra software. Unfortunately, to make this work you need to add a default gateway or static route to the cRIO, which I haven't found a way to do yet (let me know if you know how).
However, if you only need dashboard data and aren't trying to get video on the second laptop, EHaskins' instructions are all you need - you can enter what IP you want to forward to with the "remote dashboard" function in the DS software.
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Another interesting data point is that we ran a couple of weeks ago at the Sussex WI practice meet under a presumably semi-official FMS without any problem.
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That presumption would be false.
I was one of the ones helping to run that event; specifically I was working the field/control system. We were running the FMS light program, which while it may be semi-official, only provides very basic field control. We're still working on reintegrating and doing a complete overhaul of our FMS, but even then there aren't any plans to restrict access like at official events.