[Dnsmasq-discuss] Dnsmasq not advertising IPv6 Prefix

[Alan MacLeod]

Hi,

I am using the using dnsmasq to replaced bind9, isc dhcp, and radvd for
my home network.  My router is a Debian Wheezy gateway, running the
distribution provided dnsmasq 2.62 with compile time options IPv6
GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack.

The problem I have is that dnsmasq does not appear to send IPv6 RAs.

My configuration (this is all of it) is

domain-needed
resolv-file=/etc/dnsmasq.resolv.conf
interface=eth0
addn-hosts=/etc/dnsmasq.hosts
expand-hosts
domain=mydomain
dhcp-range=192.168.1.40,192.168.1.79,255.255.255.0,4h
dhcp-range=::,constructor:eth0,ra-stateless
dhcp-option=option:domain-search,mydomain
dhcp-option=option6:domain-search,mmydomain
dhcp-option=option:ntp-server,0.0.0.0
dhcp-option=option6:ntp-server,[::]

my dnsmasq.resolv.conf is 
nameserver 2620:0:ccc::2
nameserver 2620:0:ccd::2
domainname mydomain
search mydomain

where mydomain in both config files is my actual domain.

/etc/dnsmasq.hosts has a mix of SLAAC addresses for my hosts and IPv4
address for fixed addressed devices - I assume I could replace most of
this file with ra-names?

The problem appears to be that dnsmasq is not sending RAs.  The LAN
interface has a manually configured IPv6 address, its configured by a
script based on the prefix assignment from my ISP and the host portion
is set to ::1.  I read in the man pages that dnsmasq will only do RAs on
manually configured interfaces, and I wonder if there is a parameter I
am missing which means dnsmasq is ignoring the address.

syslog has the following

Aug  3 11:25:00 gateway dnsmasq[4200]: started, version 2.62 cachesize
150
Aug  3 11:25:00 gateway dnsmasq[4200]: compile time options: IPv6
GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack
Aug  3 11:25:00 gateway dnsmasq-dhcp[4200]: IPv6 router advertisement
enabled
Aug  3 11:25:00 gateway dnsmasq-dhcp[4200]: DHCP, IP range 192.168.1.40
-- 192.168.1.79, lease time 4h
Aug  3 11:25:00 gateway dnsmasq[4200]: reading /etc/dnsmasq.resolv.conf
Aug  3 11:25:00 gateway dnsmasq[4200]: using nameserver 2620:0:ccd::2#53
Aug  3 11:25:00 gateway dnsmasq[4200]: using nameserver 2620:0:ccc::2#53
Aug  3 11:25:00 gateway dnsmasq[4200]: read /etc/hosts - 6 addresses
Aug  3 11:25:00 gateway dnsmasq[4200]: read /etc/dnsmasq.hosts - 8
addresses


When I re-enable radvd everything comes works, when radvd is off, the
hosts lose their SLAAC IPv6 addresses and revert to just IPv4.

Is there anything I am obviously doing wrong - any pointers would be
appreciated.

Thanks

Alan