How to disable authenitcation ?

There are two ways to disable authentication. You should choose the right one depending on the kind of workarounds you can activate on UE side

If the UE accepts the use of EEA0/EIA0 algorithms in the NAS/RRC security mode control procedures outside of an emergency call. Then, set the following option in your MME configuration file:

authentication_mode: "skip",

If the UE supports the "CMW500 like" mode where you skip both the authentication and security mode control procedures. Then, set the following options in your MME configuration file:

authentication_mode: "skip",
skip_smc_proc: true,

Finally, for both cases, set the following option in your eNB configuration file (eNB configuration object, not the cell configuration object)

skip_smc_proc: true,

The IMSI must still be known in the UE database. If you do not know the exact value but know the range, you can use the count parameter to create several IMSI at the same time:

ue_db: [ { imsi: "0010112345600", /* International Mobile Subscriber Identity */ amf: 0x9001, /* Authentication Management Field */ sqn: "000000000000", /* Sequence Number */ K: "00112233445566778899aabbccddee00", /* UE Secret Key */ count: 1000, /* Add 100 UEs by incrementing imsi & K */ }, ]