On 11/01/2012 10:08 AM, Simon Kelley wrote:
On 01/11/12 12:59, 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.
Check.
With enable-ra and NO dhcp-range
specified, the client gets a SLAAC address and RA default route.
That's not what I'd expect. To get RA on a subnet but not dhcp, you need
to have
dhcp-range=<subnet>,ra-only
enable-ra is superfluous in that case.
Yup! Now works like a charm.
with real dhcp-range and enable-ra I get dhcp6 and RA route.
with dhcp-range=<ipv6-subnet>,ra-only I get SLAAC address and RA route.
And, in both cases the is an RDNSS entry in /etc/resolve
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] ?
The frequency will decrease over time. It's roughly every 10 seconds for
the first minute, and then about every 10 minutes.
I will need to let it run for a while ... these have been quick tests
Gene
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