Hi Raimund,

welcome to the RIOT community! Sorry for the late reply.

For auto-configuration: Have you tried compiling with
`-DGNRC_IPV6_NIB_CONF_SLAAC=1` already [1]? This compile time configuration
is set to 0 for 6LoWPAN/IEEE802.15.4 nodes. 6LoWPAN nodes use a slightly
different way of stateless address auto-configuration [2] from the classic
SLAAC [3] which inclusion is controlled with the configuration flag.
However, Linux does not really support the 6Lo-way of SLAAC so without
classic SLAAC activated the address can't be validated as the ARO is
missing from the NAs [4].

Am So., 25. Aug. 2019 um 14:32 Uhr schrieb Raimund Oude Hengel <
[email protected]>:

> […]
>
> After pulling RIOT master after several weeks without pulling I got a new
> issue. Pinging Riot node from Linux-PC fails. My client-server-set up also
> doesn't work. The Riot-node still gets requests from Linux-PC, but it
> doesn't send answers - if I set ip6-source-address by application code. If
> I don't set source address by application code, the Riot-node answers, but
> with its link-local-address which is not routable.
> Some git diff analysis and ENABLE_DEBUG showed that changes in gnrc_ipv6.c
> caused the different behavior: my preset global scope source address
> (fc00::2:6717:7427:32d:1036) is judged to be invalid.
>

Mh, if you added it as VALID [5] this definitely sounds like a bug. Were
you able to pin-point the regressing commit with tools like `git bisect` or
`git blame` (mentioning "git diff analysis" makes me think you roughly know
which line causes the behavior)? Knowing this change would be a great help
to determine what is causing this bug.

Kind regards,
Martine

[1]
http://api.riot-os.org/group__net__gnrc__ipv6__nib__conf.html#gaa47a6efaa52f16c15e9858994a395ce5
[2] https://tools.ietf.org/html/rfc6775
[3] https://tools.ietf.org/html/rfc4862
[4] https://tools.ietf.org/html/rfc6775#section-5.5.2
[5]
http://api.riot-os.org/group__net__gnrc__netif.html#gaf96707a5e322b5fa8458fba45de01837


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