[Dnsmasq-discuss] Cannot assign IPv6 address for /96 subnet

[Sheng Yang]

Sadly it's just a typo... I added it because I am failed to get it work.

After restart dnsmasq, it would not listen on dhcp-server port, based
on netstat output.

Here is the correct line of dhcphost.txt

id:00:03:00:01:06:4f:66:00:00:2e,[fc00:3:1602::dca1],vvt1,infinite

--Sheng

On Tue, Feb 12, 2013 at 1:40 PM, Simon Kelley <simon at thekelleys.org.uk> wrote:
> On 12/02/13 01:13, Sheng Yang wrote:
>>
>> Yes, I just tried, and that works.
>>
>> I am using dhcp-host files to assign all the ips on the network, I
>> guess that's what goes wrong...
>>
>> Here is the file content:
>>
>> id:00:03:00:01:06:4f:66:00:00:2e,[fc00:3:1602::dca1/96],test1,infinite
>
>                                                      ^^^
>
> You don't need the prefix length here, and it's stopping the parser from
> recognising the IPv6 address. This is probably the only problem
>
>
>
>>
>> And config file:
>> resolv-file=/etc/dnsmasq-resolv.conf
>> interface=eth0
>> listen-address=fc00:3:1602::7473
>> bind-interfaces
>> expand-hosts
>> dhcp-range=fc00:3:1602::7473,96,static
>> dhcp-hostsfile=/etc/dhcphosts.txt
>> dhcp-option=vendor:MSFT,2,1i
>> leasefile-ro
>> log-dhcp
>> log-facility=/var/log/dnsmasq.log
>> conf-dir=/etc/dnsmasq.d
>> dhcp-option=option6:dns-server,[::]
>>
>> Do I need to specify prefix length in dhcp-host file?
>
>
> See above, no you don't.
>
>
> Cheers,
>
> Simon.
>
>
>>
>> --Sheng
>>
>>
>> On Mon, Feb 11, 2013 at 12:06 PM, Simon Kelley <simon at thekelleys.org.uk>
>> wrote:
>>>
>>> On 09/02/13 02:59, Sheng Yang wrote:
>>>>
>>>>
>>>> Hi Simon,
>>>>
>>>> I found I can't assign IPv6 address for /96 subnet.
>>>>
>>>> I specified DHCP range use 96 bits prefixes:
>>>>
>>>> dhcp-range=fc00:3:1602::7473,96,static
>>>>
>>>> And here is nic:
>>>>
>>>> 2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP>  mtu 1500 qdisc pfifo_fast
>>>> state UP qlen 1000
>>>>       link/ether 06:8a:42:00:00:2f brd ff:ff:ff:ff:ff:ff
>>>>       inet6 fc00:3:1602::7473/96 scope global
>>>>          valid_lft forever preferred_lft forever
>>>>       inet6 fe80::48a:42ff:fe00:2f/64 scope link
>>>>          valid_lft forever preferred_lft forever
>>>>
>>>> I've enabled logdhcp, but didn't see anything in the log after restart
>>>> the dnsmasq except loading configurations info.
>>>>
>>>> TCPDUMP shows:
>>>>
>>>> 02:54:53.695350 IP6 fe80::44f:66ff:fe00:2e.dhcpv6-client>
>>>> ff02::1:2.dhcpv6-server: dhcp6 solicit
>>>> 02:54:54.726548 IP6 fe80::44f:66ff:fe00:2e.dhcpv6-client>
>>>> ff02::1:2.dhcpv6-server: dhcp6 solicit
>>>> 02:54:56.838944 IP6 fe80::44f:66ff:fe00:2e.dhcpv6-client>
>>>> ff02::1:2.dhcpv6-server: dhcp6 solicit
>>>>
>>>> More detail:
>>>> 02:55:57.448471 IP6 (hlim 1, next-header UDP (17) payload length: 73)
>>>> fe80::44f:66ff:fe00:2e.dhcpv6-client>  ff02::1:2.dhcpv6-server: [udp
>>>> sum ok] dhcp6 solicit (xid=4157d (client-ID hwaddr type 1
>>>> 064f6600002e) (option-request DNS-name Client-FQDN DNS NTP-Server)
>>>> (elapsed-time 101) (Client-FQDN) (IA_NA IAID:1711276078 T1:3600
>>>> T2:5400))
>>>> 0x0000:  3333 0001 0002 064f 6600 002e 86dd 6000
>>>> 0x0010:  0000 0049 1101 fe80 0000 0000 0000 044f
>>>> 0x0020:  66ff fe00 002e ff02 0000 0000 0000 0000
>>>> 0x0030:  0000 0001 0002 0222 0223 0049 4b0e 0104
>>>> 0x0040:  157d 0001 000a 0003 0001 064f 6600 002e
>>>> 0x0050:  0006 0008 0018 0027 0017 001f 0008 0002
>>>> 0x0060:  0065 0027 0009 0006 7562 756e 7475 0000
>>>> 0x0070:  0300 0c66 0000 2e00 000e 1000 0015 18
>>>>
>>>> Seems valid.
>>>>
>>>> If I didn't specify "96" in the dhcp-range line, it would complains:
>>>>
>>>> Feb  9 02:57:15 dnsmasq-dhcp[2134]: no address range available for
>>>> DHCPv6 request via eth0
>>>>
>>>> I don't know which part of setup is wrong. Probably due to link local
>>>> address is /64?
>>>
>>>
>>>
>>> Let's make the problem simpler: is you specify a range for address
>>> allocation, does it work?
>>>
>>> dhcp-range=fc00:3:1602::7473,fc00:3:1602::8000,96
>>>
>>>
>>> How are you specifying the static addresses of your hosts?
>>>
>>>
>>> Cheers,
>>>
>>> Simon.
>>>
>>> _______________________________________________
>>> Dnsmasq-discuss mailing list
>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>
>>
>