Re: [lwip-devel] IPv6 L2TP PPP review

[Sylvain Rochet]

Hello Ivan,


On Wed, Mar 04, 2015 at 10:12:54AM -0700, Ivan Delamer wrote:
> Hi Sylvain,
> 
> Ok, now I understand the scenario a bit better.
> 
> For neighbour discovery to work, you need to be subscribed to the
> solicited-node multicast address.
> 
> This is usually done automatically when you set the state to TENTATIVE.
> 
> If you set the address manually to PREFERRED, then you must join the
> multicast group manually:
> 
> ip6_addr_set_solicitednode(&multicast_address, netif_ip6_addr(netif, 
> 1)->addr[3]);
> mld6_joingroup(netif_ip6_addr(netif, 1), &multicast_address);
> 
> This will allow ND multicast packets into the stack.

Oh!, it works!, thank you.


> If you have a PPP link, I suspect ND is not used and you just send
> the packets to the neighbour, so in that case you wouldn't need
> this.

I will check, I must admit I didn't do more than pinging link-local IPv6 
addresses over a PPP link, now that I understand a bit more ND/MLD/IPv6 
I will be able to troubleshoot, if necessary, IPv6 over PPP when using 
global addresses.


> I believe your address is up and running correctly, it just isn't
> discoverable. But in PPP you don't do discovery.

Yep :)


Sylvain

signature.asc
Description: Digital signature