On 11/01/2012 10:12 AM, Simon Kelley wrote:
On 01/11/12 13:48, Gene Czarcinski wrote:
On 11/01/2012 08:59 AM, Gene Czarcinski wrote:
On 10/31/2012 04:41 PM, Gene Czarcinski wrote:
Instead of running both radvd and dnsmasq, I would like to run only
dnsmasq and have it do what is now being done by radvd.
This is for libvirt so there are some specifics which could help.
1. There will be one and only one interface for an instance of dnsmasq.
2. Currently (at least with some patches I have created) run one ipv4
dhcp subnetwork or one ipv6 dhcp supnetwork or both one ipv4 network
and one ipv6 network.
3. If a dhcp-range is specified for the ipv6 subnetwork then I need
the AdvManagedFlag on which (I believe) is done with the additional
dsnmasq parameter "enable-ra".
4. But, I may have an IPv6 subnetwork but dhcp-range has not been
specified. In this case I want the AdvManagedFlag off. This one is
the situation that I am not clear on.
5. None of the other dnsmasq capabilities with respect to RA will be
used.
Comments/suggestions?
If this requires a little enhancement patch, I am willing.
OK, I believe I have answered my own question but I would still like
confirmation.
I ran a test with no radvd running ... only dnsmasq. With enable-ra
and dhcp-range specified for ipv6 addresses, the client side gets a
dhcp6 address and RA default route. With enable-ra and NO dhcp-range
specified, the client gets a SLAAC address and RA default route.
With enable-ra and dhcp-range,I do notice a lot of RTR-ADVERT messages
... like one every couple of seconds. Is there a way to suppress this
message and/or increase the time between the events or at least the
messages [that is without disabling dhcp logging] ?
Maybe it would be useful is this message was only sent to the syslog
once every ten or twenty events.
One additional question With enable-ra and dhcp-range, then dnsmasq
supplies the RDNS info in the RA packet but it does not if dchpv6 is not
specified. It seems like this should be reversed.
It will always supply the RDNS info if it can find a dhcp-option to get
the info from. I wonder if you have another RA daemon on the net which
is providing advertisements ahich are being used when you don't have
them correctly configured in dnsmasq?
Oops ... I had defined a IPv6 address so libvirt had radvd running.
Reconfigured with IPv6 address and no radvd. This does require that I
add two ip6tables rules for port 547 and forwarding between guests. It
works.
Gene
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