Request temporary address (IA_NA) for the 6lbr example

[OlegHahm]

Contribution description

Additionally to requesting a delegated prefix via DHCPv6 this also enables to ask for a temporary (non-permanent) address on the 6lbr. If the upstream DHCP server provides one, this can be used to establish end-to-end connectivity from the 6lbr towards an Internet host directly.

Testing procedure

1. Bridge the upstream interface of the border router to your upstream router (assuming that it does DHCPv6) or configure a local DHCPv6 server, for instance KEA with a configuration like this
2. Run the border router and check if you can ping Internet hosts directly.

[riot-ci]

Murdock results

✔️ PASSED

63e7cc2 examples/gnrc_border_router: request temp address

Success	Failures	Total	Runtime
19	0	19	01m:51s

Artifacts

• Documentation preview

[benpicco]

I don't understand why this is needed - with my Fritz!Box SLAAC works just fine

[OlegHahm]

If SLAAC is activated, you don't need this.