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Currently sgsn_alloc_ptmsi uses rand() to get a new P-TMSI and then sets to upper 2 MSB. Therefore there is no lower limit of the distance between 2 identical P-TMSI. This patch changes the implementation to discard any random value above 2^30 and to generate a new random number in that case until a fitting number is found (or a repetition limit is reached). This way, all number below 2^30 within the PRNG's period are used. Ticket: OW#1362 Sponsored-by: On-Waves ehf
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