Hello Clement, Am 25.06.2020 um 17:01 schrieb Clement Cormier: > Hello, > > I am using the example "gnrc_networking" on the IoT-LAB platform with > M3 nodes (latest version of RIOT). > I have a problem with link-local addresses. I figured out that some of > my nodes have the same link-local address. > For example : > > m3-369; inet6 addr: fe80::14bb:f965:106b:1114 scope: link VAL > m3-361; inet6 addr: fe80::14bb:f965:106b:1114 scope: link VAL > > When I request a node about his parent using "rpl show", it only > returns the link-local address of his parent so I can't associate this > address with one particular node. > > I tried to find the way these addresses are constructed but without > success. I thought it was based on the MAC address. The link-local addresses on the IoT-LAB M3 are generated from the EUI-64 which in turn is generated from a LUID (Local Unique ID) [1] which again is based on the MCU's CPU-ID [2, 3]. For an automated approach you could e.g. change the implementation how the CPU-ID is converted to the LUID (you don't even need to change the `luid` module code, you can overload `luid_base()` in your application).
Alternatively, you could of course set the link-local addresses in question manually, note however that for that also the EUI-64 (long HWaddr) needs to be changed, as otherwise address resolution as per RFC 6775 [4] will not work anymore. Hope that helps and Best Regards, Martine [1] https://github.com/RIOT-OS/RIOT/blob/2bb9a392b41db5725310c2207ed9e457a1ea1ff1/drivers/at86rf2xx/at86rf2xx.c#L103 [2] https://github.com/RIOT-OS/RIOT/blob/2bb9a392b41db5725310c2207ed9e457a1ea1ff1/sys/luid/luid.c#L94 [3] https://github.com/RIOT-OS/RIOT/blob/2bb9a392b41db5725310c2207ed9e457a1ea1ff1/sys/luid/luid.c#L37-L45 [4] https://tools.ietf.org/html/rfc6775#section-5.6 > > Have you an idea of how I can fix this problem ? > > Any help would be really appreciated. > > > Thanks, > > > Clément Cormier > > University of Caen, France > > > > > > _______________________________________________ > users mailing list > users@riot-os.org > https://lists.riot-os.org/mailman/listinfo/users
0xCF08E63979631D1C.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature
_______________________________________________ users mailing list users@riot-os.org https://lists.riot-os.org/mailman/listinfo/users
