[Dnsmasq-discuss] Need some indications to patch dnsmasq, to exclusive) to bypass /64 limit

[dnsmasq.bertrandb at dfgh.net]

Le 21/11/2013 13:46, Simon Kelley - simon at thekelleys.org.uk a écrit :
Ok that's work ...
the problem was ...
linvirt doesn't put prefix on dhcp-range
when i made modification on my /var/lib/libvirt/dnsmas/default-ipv6.conf 
file and send the kill -HUp to the process dnsmasq did not réinterpret 
the modified dhcp-range instruction.

If i kill the process and launch /usr/sbin/dnsmasq 
--conf-file=/var/lib/libvirt/dnsmasq/default-ipv6.conf things are ok.

thanks for your help i'll make a report to libvirt guy "DNSMASQ need 
prefix in dhcp-range for dhcpv6"

> On 16/11/13 09:08, dnsmasq.bertrandb at dfgh.net wrote:
>>> You should be able to configure DHCPv6 in dnsmasq to handle larger
>>> prefixes. You can't do SLAAC address allocation that way, because it
>>> depends on a 64-bit prefix and a 64-bit EUI-64 id, but DHCP works.
>>>
>>> Something like
>>>
>>> dhcp-range=<start-address>,<end-address>,92
>>>
>>> The prefix length MUST match the prefix length configured in the local
>>> inerface.
>>
>> Thanks for the response i try
>> I make the modification on /var/lib/libvirt/dnsmasq/reseau.conf and kill
>> up the process
>> so my dnsmasq.conf is :
>> ##WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY 
>> TO BE
>> ##OVERWRITTEN AND LOST. Changes to this configuration should be made 
>> using:
>> ## virsh net-edit default-ipv6
>> ## or other application using the libvirt API.
>> ##
>> ## dnsmasq conf file created by libvirt
>> strict-order
>> domain-needed
>> domain=root.belguise.eu
>> expand-hosts
>> local=/root.belguise.eu/
>> pid-file=/var/run/libvirt/network/default-ipv6.pid
>> except-interface=lo
>> bind-dynamic
>> interface=virbr0
>> dhcp-range=192.168.122.2,192.168.122.254
>> dhcp-no-override
>> dhcp-range=2a00:c70:1:xxx:xxx:xxx:8106:901,2a00:c70:1:xxx:xxx:xxx:8106:f01,97 
>>
>>
>> dhcp-leasefile=/var/lib/libvirt/dnsmasq/default-ipv6.leases
>> dhcp-lease-max=1790
>> dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default-ipv6.hostsfile
>> addn-hosts=/var/lib/libvirt/dnsmasq/default-ipv6.addnhosts
>> #enable-ra
>>
>> mybridge is on same prfix
>> root at root:~# ifconfig virbr0
>> virbr0 Link encap:Ethernet HWaddr 52:54:00:89:5a:8e
>> inet adr:192.168.122.1 Bcast:192.168.122.255 Masque:255.255.255.0
>> adr inet6: 2a00:c70:1:xxx:xxx:xxx:8106:ffff/97 Scope:Global
>>
>> and I got
>> Nov 16 09:53:51 root dnsmasq-dhcp[2371]: no address range available for
>> DHCPv6 r
>> equest via virbr0
>>
>> if I change the prefix in /64 i see an RTR-ADVERT in log
>> not with /97 (i'd try with /112 too)
>> I think that dhclient on my vm's send an RTR-SOLLICIT whish is the
>> origin of the message and don't send DHCP stuff since there is no
>> reponse to is RTR-SOLLICIT
>>
>> On my vm (debian wheezy) my /etc/network/interfaces is
>>
>> iface eth0 inet6 dhcp
>> accept-ra 0
>> autoconf 0
>>
>
>
> What version of dnsmasq are you using? I just tried this with the 
> latest code, and didn't see this error.
>
> Cheers,
>
> Simon.
>
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