hey guys sorry for the dumb question I followed the instructions at http://n900-ipv6.garage.maemo.org/ and in this step should the ipv4 apn and ipv6 apn be the same?

# Edit the 00_enable_apn_ipv6 file with an editor (e.g. vi) in order to setup a) the IPv4 APN value to hook up when activating IPv6 APN, b) the IPv6-capable APN value, c) the IPv6 APN username and d) the IPv6 APN password, finishing by saving the changes

Ive put the ipv4 apn as the original and the ipv6 to the one tmobile sent me in confirmation letter. it works but how do i know it switching between ipv4 and ipv6 properly. thanks guys