If you have downloaded all the applications, and unpacked all :
$ cd <folder with nist etc.>/
$ grep -Rin 802.21 * >> 80221
OpenMIH is an Opensource IEEE 802.21 implementation.
It comes with an demo for MIH-assisted pre-authentication.
For details see following paper: ....
... You are right. I don't see any IEEE 802.21 in the old ns-2.29 nist files.
NS-MIH-MULTI-CRITERIA : I have a recent executable "ns-mih-multi-criteria".
Don't remember why I think there should be issues. Compiles OK.
Simulations : ABCpref.sh, distance.sh : OK.
The build : ( I made up a clean version, ns-allinone-2.29-MIH-MULTI.tar.gz )
tar xvf ns-allinone-2.29-MIH-MULTI.tar.gz
export CC=gcc34 CXX=g++34 && ./install
# make install