Hi
Install those network cards onto a PC that has WinXP or even Windows 7. Open command prompt and type
ping ::1
If you get a response then your cards support IPv6
I have added what you should get as a response down below
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\>ping ::1
Pinging ::1 with 32 bytes of data:
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Ping statistics for ::1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
Picking pebbles on the shore of the networking ocean