[lwip-devel] [bug #37993] IPv6 Does Not Subscribe to Link-Local All-Nodes Multicast Group By Default

[Ivan Delamer]

Update of bug #37993 (project lwip):

             Assigned to:                    None => idelamer               

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Follow-up Comment #1:

Hi Grant,

Thank you for reporting this. Lets discuss whether it is actually a bug or
your steps are necessary.

Nodes must always accept packets addressed to ff02::1. This is not handled my
the multicast system as this group membership is not reported. So this must be
enabled at the MAC level during initialization, as you have done. This is the
case even when MLD is not enabled: SLAAC should still work, but it is up to
the user to enable the filter for all-nodes LL and also for the autoconfigured
LL address.

In the second part of your post, for creating a LL address and enabling SLACC,
I don't believe this should be done internally. SLAAC must be enabled per
netif, as it is not always desirable in all netifs (e.g. think PPP netif).
Likewise, the creation of a LL address depends on the MAC type and therefore
can't be done automatically. There is a helper method for IEEE 802.3 type MAC
addresses, but that's again as far as you can go. Think PPP as an example
again.

I'm leaving the bug as open for now, waiting for some more opinions.

Cheers
Ivan


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