Lorenzo Milesi (max...@ufficyo.com) wrote on Thu, Oct 15, 2015 at 04:18:17AM 
BRT:
> > The address range is defined in the dhcp-range declaration. Either you put 
> > the
> > start and end addresses or you use the constructor feature, in which case 
> > the
> > prefix will come from the interface where the request arrived. Note that you
> > have to configure the ipv6/prefix-length of all the interfaces where dnsmasq
> > listens.
> 
> This is my dhcp config:
> 
> # ipv6
> dhcp-range=2001:1410:105:858b::ff00,2001:1410:105:858b::ff50,64,12h
> dhcp-option=option6:router,2001:1410:105:858b::1
> dhcp-option=option6:dns-server,[::]

This is fine, clients should get addresses IF your interface is configured
accordingly. Make sure it is.

> dhcp-option=option6:router,2001:1410:105:858b::1

This is bogus. There's no router option in dhcpv6.

> dhcp-option=option6:dns-server,[::]

This is correct but not necessary, dnsmasq does it by default.

Check the dnsmasq log to see if clients request addresses and get answers.
Check the clients to see which addresses they get and the lease time.

Make sure your 2 routers are sending compatible announcements (prefix, lease
time).

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