[lwip-devel] Neighbor discovery - on-link flag in router advertisement.

[Krishna Shingala]

The neighbor discovery module in lwIP version 2.0.2 requires the on-link flag
to be set in order to create a SLAAC address using the prefix disseminated
by the router in the router advertisement. While this general true, the RFC
7668 that describes 6LoWPAN adaptations for Bluetooth Low Energy transport
mandates this flag is always zero.

This implies that the current released version of lwIP cannot work as
expected for BLE-6LoWPAN. 

One of the solutions could be to have a define in lwipopts.h to enable or
disable the check.
However, this may not be a good solution if we consider use cases that the
stack on various transports like BLE, 802.15.4, Perhaps its better to accept
the configuration per interface when the interface is created.

Ideas, thoughts?



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