How is IP address assigned

[[석찬]]

Hi, Suman.

Let me try to explain how UE IP is configured in general.

o Read configuration.
 - ./support/config/nextepc.conf.in:339
    ue_pool:
      - addr: 45.45.0.1/16
      - addr: cafe::1/64
 - src/pgw/pgw_context.c:739
     subnet = pgw_subnet_add(ipstr, mask_or_numbits, apn, dev);

o Generate UE Pool
 - src/pgw/pgw_init.c:32
     rv = pgw_ue_pool_generate();

o If UE try to attach, new IP is allocated from the UE POOL.
 - src/pgw/pgw_context.c:923
     pgw_sess_t *pgw_sess_add(....)
     {
          ...
     }
 - src/pgw/pgw_context.c:960
      sess->ipv4 = pgw_ue_ip_alloc(AF_INET, apn);

And then, the UE IP is delivered to SGW/MME using GTPv2-C.
Finally, MME is sending the UE IP through NAS message(Activate default EPS
bearer context request.)

Let me know if you have more information.

Thanks!







2019년 3월 23일 (토) 오전 8:41, Suman Bhunia <sbhunia at tamu.edu>님이 작성:

> Hello!
>
> We just started using NextEPC at our lab and came across a few problems. I
> was wondering if anyone could provide me some guideline on how the EPC
> assigned IP address to the UEs.  Any document or even pointing me to the
> correct section of code in the GitHub will be helpful.
>
> Thank you for your kind help.
>
> Thanks,
> Suman Bhunia
> Postdoctoral scholar
> Texas A&M University
>
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