stripped-username for eap sim

[martin robertino]

Hi all,
i'm using freeradius 2.1.9 for eap sim testing
i have simtriplets.dat with format : imsi.RAND,SRES,Kc
and i'm having message probleme:
rlm_sim_files : insufficient number of challenges for imsi
151008xxxxxxxxx at wlan.mnc008.mcc310.3gppnetwork.org
[sim_files] : returnnot found

i read that we should strip that full username :
151008xxxxxxxxx at wlan.mnc008.mcc310.3gppnetwork.org
into strip username: 131008xxxxxxxxx and realm
wlan.mnc008.mcc310.3gppnetwork.org
am i correct?

so how do i configure that strip username for authorizing into
rlm_sim_files and to simtriplets.dat?

thanx

best regards,
martin
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