Hello : I'm new to freeradius , still learning the basics , what i'm trying to do is set up an freeradius eap-sim server for a telco that has both access to sim's as well as access to a HLR and HHS . I've been lurking on the list a wile so here goes with a few questions. Hopeful not to stupid .... Are there any "How to's" that show in detail how to set this up ? I've found lots of info on the different forms of EAP but not much on EAP-SIM. The end result of the whole thing is to let a user's phone get authorized and authenticated using the SIM card in the phone. doing so with freeradius . from the modules/Rlm_eap docs: "To configure EAP-SIM authentication, the following attributes must be set in the server. This can be done in the users file, but in many cases will be taken from a database server, via one of the SQL interface. If one has SIM cards that one controls (i.e. whose share secret you know), one should be able to write a module to generate these attributes (the triplets) in the server. If one has access to the SS7 based settlement network, then a module to fetch appropriate triplets could be written. This module would act as an authorization only module. The attributes are: EAP-Sim-Rand1 16 bytes EAP-Sim-SRES1 4 bytes EAP-Sim-KC1 8 bytes EAP-Sim-Rand2 16 bytes EAP-Sim-SRES2 4 bytes EAP-Sim-KC2 8 bytes EAP-Sim-Rand3 16 bytes EAP-Sim-SRES3 4 bytes EAP-Sim-KC3 8 bytes EAP-SIM will send WEP attributes to the resquestor." Some questions , if I know the shared secret , how is that used to generate the attributes ? any guides out there for this ? I also have access to a SS7 network , any examples on how to write a module to fetch the attributes from there ? As I stated before I'm "NEW" at this , I've been working with radius for a few weeks , mainly using it in conjunction with a learning book called FreeRadius Beginners guide. I'm trying to do this project with Open Source Free Software to show the company it's possible . Sure we could just buy a canned solution but I'm a supporter of Open source and I believe it can be done. any help would be appreciated , just some pointers to resources if you know of any , or if you have successfully done this how did you accomplish it ? Thanks for your time Greg