[Dnsmasq-discuss] Router Advertisement ignores --(except-)interface option ?

[Simon Kelley]

On 25/09/12 14:52, Julien Muchembled wrote:
> I simplified a little. eth0 is bridged (br0) with several tap
> interfaces. Both br0 and eth1 get public /64 ipv6: - eth1 gets ipv6
> from the ISP box only because this is default configuration: it will
> probably be unused so in case of trouble, autoconf will be disabled
> (in fact, because forwarding is enabled, default route is already
> discarded) - br0 gets ipv6 from a VPN (which also sets the default
> route): the /64 prefix is shared with all other hosts connected on
> eth0 (there's a switch of course)
>
> Le 09/25/12 15:06, Simon Kelley a écrit :
>> What is the configuration of the two interfaces, eth0 and eth1.?
>> I'm particularly interested in their IPv6 addresses and prefix
>> lengths.
>
> I'm surprised you're interested in their IPv6 addresses. I
> obsfuscated some parts since I prefer not to publish them:

Obfuscated addresses is fine, (or send information to me off-link). I 
ask because the relationship between subnets on interfaces and in 
dhcp-range statements is central to deciding where to send Router 
Advertisements.

> - eth1:
> 2a01:e35:uuvv:460:ecaf:a888:71e:6864/64 scope global temporary dynamic
> 2a01:e35:uuvv:460:82ee:73ff:fexx:yyzz/64 scope global dynamic
 > fe80::82ee:73ff:fexx:yyzz/64 scope link
 > - br0:
> 2001:67c:ttww:3::1/64 scope global fe80::5c88:f1ff:fefd:d9f9/64 scope link

> - dnsmasq: -i br0 -F 2001:67c:ttww:3::1,ra-only,64,1d

When your laptop got an IPv6 from the router, was it in the 
2001:67c:ttww:3::/64 subnet? Is there any chance that eth1 is bridged to 
br0? That would explain things, I think.

Cheers

Simon.