Multiple NDIS IM driver have same filter class problem

Hi All,

I have problem with NDIS IM filter driver. My application uses NDIS IM
Filter driver 5.0 for packet filtering.it has filter class "failover".
When i am trying to installed 3rd party VPN Client software on the
machine. I have encounter 2 problems.
Note that the VPN Client software also installs its NDIS IM driver
with the filter class "failover"

Problem 1: if my application is installed prior to the VPN client
software, then VPN client is not able to create VPN Adapter.

Problem 2: if VPN Client application is installed prior to my
application then VPN Client software is not able to communicate with
VPN server. If i uninstall driver used in my application then VPN
client software works fine.

Is the problem related with the NDIS IM Filter Classes.
I have changed filter class of my NDIS IM driver but the problem was
not solved.

Is there any way to work 2 NDIS IM driver with same filter classes?

Regards,
SAM