wake on lan / wol with linux in IPv6-LAN (without IPv4)

[Enno Rey]

Hi,

On Wed, Sep 17, 2014 at 12:07:23PM +0200, Ignatios Souvatzis wrote:
> On Wed, Sep 17, 2014 at 11:59:55AM +0200, Ignatios Souvatzis wrote:
> > Hi,
> > 
> > On Wed, Sep 17, 2014 at 10:14:31AM +0200, Mikael Abrahamsson wrote:
> > 
> > > So, one interpretation would be that if the device hasn't subscribed to the
> > > "all IPv6 nodes" multicast group, it's not an IPv6 node, and shouldn't
> > > receive the traffic.

RFC 2710, sect. 5, states that no REPORT or DONE messages are to be sent for link-scope all-nodes (ff:02::1), so one can't potentially "subscribe" to that address in a setting with MLD snooping.


> 
> RFC 4541 "Considerations for Internet Group Management Protocol (IGMP)
> and Multicast Listener Discovery (MLD) Snooping Switches" says:
> 
> "3. IPv6 Considerations
>  [...]
> 
>    In IPv6, the data forwarding rules are more straight forward because
>    MLD is mandated for addresses with scope 2 (link-scope) or greater.
>    The only exception is the address FF02::1 which is the all hosts
>    link-scope address for which MLD messages are never sent.  Packets
>    with the all hosts link-scope address should be forwarded on all
>    ports."
> 
> 	-is

it should be noted that RFC 4541 is an "Informational" one and I don't think any normative value for a kind-of vendor-proprietary thing called "MLD snooping" might be attached to it ;-)

best

Enno

 




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Enno Rey

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