[Dnsmasq-discuss] Dnsmasq 2.68 not assign IPv6 address, error -- no addresses available

Da Zhao Y Yu dzyu at cn.ibm.com
Tue Feb 18 02:32:07 UTC 2014


Sorry for pasted the wrong host info, the subnet in the host file was same 
as dnsmasq process. I just pasted another host file. The host file content 
as below:

fa:16:3e:99:c6:54,host-2011-2011-0-f101--3.openstacklocal,2011:2011:0:f101::3.

The client still can not get IPv6 address, even on the same subnet.




From:   Simon Kelley <simon at thekelleys.org.uk>
To:     dnsmasq-discuss at lists.thekelleys.org.uk, 
Date:   2014/02/17 19:36
Subject:        Re: [Dnsmasq-discuss] Dnsmasq 2.68 not assign IPv6 
address, error -- no addresses available
Sent by:        dnsmasq-discuss-bounces at lists.thekelleys.org.uk



On 17/02/14 02:38, Da Zhao Y Yu wrote:
> Hi Simon,
> 
> Thanks for your reply.
> 
> You said the error may be caused by dnsmasq is not recognising the
> client, how to verify it?
> 
> After set--log-dhcp, it have the corresponding tag called "know", you
> can see the below log:
> 
> 
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 available DHCPv6 subnet: 2011:2011:0:f101::/64
                                    ^^^^^^^^^^^^^^^^^^^^^^
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 client MAC address: fa:16:3e:99:c6:54
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 DHCPSOLICIT(tap1a82f5d5-e9)
> 00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 DHCPADVERTISE(tap1a82f5d5-e9)
> 00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54 no addresses available
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 *tags: known, dhcpv6, tap1a82f5d5-e9*
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 sent size: 14 option:  1 client-id
>  00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 sent size: 10 option:  2 server-id 
00:03:00:01:00:0a:f7:1d:70:5c
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 sent size: 12 option:  3 ia-na  IAID=1050265172 T1=4294967295
> T2=4294967295
> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
> 16372489 sent size: 24 option: 13 status  2 no addresses available
> 
> About how to configuring host address in dnsmasq, I use
>  "--dhcp-hostsfile" to let dnsmasq to read the host file, the content of
> the host file as below:
> 
> 
fa:16:3e:99:c6:54,host-2003-2033-0-f103--3.openstacklocal,2003:2033:0:f103::3
                                                           ^^^^^^^^^^^^^

So dnsmasq is recognizing the host, but the address you've specified for
it is on a different subnet, so it's not usable. No usable address for
host, static address allocation configured, -> "no addresses available"


Cheers,

Simon.

> 
> 
> Looking forward to your reply, thanks!
> 
> 
> 
> From:        Simon Kelley <simon at thekelleys.org.uk>
> To:        dnsmasq-discuss at lists.thekelleys.org.uk,
> Date:        2014/02/14 22:50
> Subject:        Re: [Dnsmasq-discuss] Dnsmasq 2.68 not assign IPv6
> address, error -- no addresses available
> Sent by:        dnsmasq-discuss-bounces at lists.thekelleys.org.uk
> ------------------------------------------------------------------------
> 
> 
> 
> On 14/02/14 08:46, Da Zhao Y Yu wrote:
>> More investigate about this issue:
>>
>> I found the dnsmasq dhcp client id is generated by client MAC address,
>> but the dhcp server id is not generated by the binding tap
>> interface(*tap1a82f5d5-e9*) MAC address. Base on the server id (
>> 00:03:00:01:00:0a:f7:1d:70:5c), I found it is generated by another
>> network device, the MAC address(0a:f7:1d:70:5c) is matched with eth4 in
>> my env, and also eth4 device is in "inactive" status, I do not know the
>> root cause.
>>
>> For IPv4, the client can got the IP address, just on IPv6 case, have
>> such issues.
>>
>>
>> --------------------------------------------------
>>
>>
>>
>> From: Da Zhao Y Yu/China/IBM at IBMCN
>> To: Dnsmasq-discuss at lists.thekelleys.org.uk,
>> Date: 2014/02/14 12:04
>> Subject: Re: [Dnsmasq-discuss] Dnsmasq 2.68 not assign IPv6 address,
>> error -- no addresses available
>> Sent by: dnsmasq-discuss-bounces at lists.thekelleys.org.uk
>> 
------------------------------------------------------------------------
>>
>>
>>
>> After add '--log-dhcp' in dnsmasq, more log in /var/log/message, as 
below:
>>
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 available DHCPv6 subnet: 2011:2011:0:f101::/64
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 client MAC address: fa:16:3e:99:c6:54
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 DHCPSOLICIT(tap1a82f5d5-e9)
>> 00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 DHCPADVERTISE(tap1a82f5d5-e9)
>> 00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54 no addresses available
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 tags: known, dhcpv6, tap1a82f5d5-e9
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 sent size: 14 option: 1 client-id
>> 00:01:00:01:1a:90:4c:42:fa:16:3e:99:c6:54
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 sent size: 10 option: 2 server-id 
00:03:00:01:00:0a:f7:1d:70:5c
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 sent size: 12 option: 3 ia-na IAID=1050265172 T1=4294967295
>> T2=4294967295
>> Feb 13 21:56:29 x3650m4-ir10-7915j2a-06nrrh8 dnsmasq-dhcp[3610]:
>> 16372489 sent size: 24 option: 13 status 2 no addresses available
>>
>> Any help would be appricated, thanks!!!
>>
>>
>> -------------------------------------------------
>> Cloud Solutions & OpenStack Development
>> China Systems & Technology Laboratory in Beijing
>> Email: dzyu at cn.ibm.com
>> Tel: (86)10-82450677
>> --------------------------------------------------
>>
>>
>>
>> From: Da Zhao Y Yu/China/IBM
>> To: Dnsmasq-discuss at lists.thekelleys.org.uk,
>> Date: 2014/02/13 18:23
>> Subject: Dnsmasq 2.68 not assign IPv6 address, error -- no addresses
>> available
>> 
------------------------------------------------------------------------
>>
>>
>> Hi all,
>>
>> Today I used dnsmasq 2.68 as dhcpv6 server to assign IP address to vm
>> instance, and encountered the following issue:
>>
>> 1, The dnsmasq process as below:
>>
>> /usr/sbin/dnsmasq --no-hosts --no-resolv --strict-order
>> --bind-interfaces --interface=*tap1a82f5d5-e9* --except-interface=lo
>>
> 
--pid-file=/var/lib/neutron/dhcp/a5d2bd6f-4509-483d-97df-66582e86b661/pid 
--dhcp-hostsfile=/var/lib/neutron/dhcp/a5d2bd6f-4509-483d-97df-66582e86b661/host
> 
>>
> 
--dhcp-optsfile=/var/lib/neutron/dhcp/a5d2bd6f-4509-483d-97df-66582e86b661/opts
> 
>> --leasefile-ro --dhcp-range=set:tag0,2011:2011:0:f101::,static,86400s
>> --dhcp-lease-max=16777216
>>
>> 2, In ubuntu vm instance, I use *dhclient -6* to send request, and in
>> controller node, use* tcpdump -i tap1a82f5d5-e9* to monitor the result,
>> as below:
>>
>> tcpdump: WARNING: tap1a82f5d5-e9: no IPv4 address assigned
>> tcpdump: verbose output suppressed, use -v or -vv for full protocol 
decode
>> listening on tap1a82f5d5-e9, link-type EN10MB (Ethernet), capture size
>> 65535 bytes
>> 04:02:04.230789 IP6 fe80::f816:3eff:fe41:b297.dhcpv6-client >
>> ff02::1:2.dhcpv6-server: dhcp6 solicit
>> 04:02:04.232872 IP6 fe80::d046:83ff:fec3:cd10 > ff02::1:ff41:b297:
>> ICMP6, neighbor solicitation, who has fe80::f816:3eff:fe41:b297, length 
32
>> 04:02:04.233682 IP6 fe80::f816:3eff:fe41:b297 >
>> fe80::d046:83ff:fec3:cd10: ICMP6, neighbor advertisement, tgt is
>> fe80::f816:3eff:fe41:b297, length 32
>> 04:02:04.233702 IP6 fe80::d046:83ff:fec3:cd10 >
>> fe80::f816:3eff:fe41:b297: ICMP6, neighbor solicitation, who has
>> fe80::f816:3eff:fe41:b297, length 24
>> 04:02:04.234124 IP6 fe80::f816:3eff:fe41:b297 >
>> fe80::d046:83ff:fec3:cd10: ICMP6, neighbor advertisement, tgt is
>> fe80::f816:3eff:fe41:b297, length 24
>> 04:02:04.331231 IP6 fe80::d046:83ff:fec3:cd10.dhcpv6-server >
>> fe80::f816:3eff:fe41:b297.dhcpv6-client: dhcp6 advertise
>> 04:02:05.301072 IP6 fe80::f816:3eff:fe41:b297.dhcpv6-client >
>> ff02::1:2.dhcpv6-server: dhcp6 solicit
>> 04:02:05.301173 IP6 fe80::d046:83ff:fec3:cd10.dhcpv6-server >
>> fe80::f816:3eff:fe41:b297.dhcpv6-client: dhcp6 advertise
>>
>> It seems the network request have been sent from vm instance, and 
dhcpv6
>> server also got the message, but the vm instance still can not get the
>> special IPv6 address, also from /var/log/message, I saw the dsnmasq
>> error message:
>>
>> dnsmasq-dhcp[24313]: read
>> /var/lib/neutron/dhcp/a5d2bd6f-4509-483d-97df-66582e86b661/host
>> dnsmasq-dhcp[24313]: read
>> /var/lib/neutron/dhcp/a5d2bd6f-4509-483d-97df-66582e86b661/opts
>> dnsmasq-dhcp[24313]: DHCPSOLICIT(tap1a82f5d5-e9)
>> 00:01:00:01:1a:8f:54:b6:fa:16:3e:41:b2:97
>> dnsmasq-dhcp[24313]: DHCPADVERTISE(tap1a82f5d5-e9)
>> 00:01:00:01:1a:8f:54:b6:fa:16:3e:41:b2:97 no addresses available
>> dnsmasq-dhcp[24313]: DHCPSOLICIT(tap1a82f5d5-e9)
>> 00:01:00:01:1a:8f:54:b6:fa:16:3e:41:b2:97
>> dnsmasq-dhcp[24313]: DHCPADVERTISE(tap1a82f5d5-e9)
>> 00:01:00:01:1a:8f:54:b6:fa:16:3e:41:b2:97 no addresses available
>>
>> I do not know how to fix this issue, so can you give me some help about
>> it, thanks!
>>
>>
> 
> 
> Your configuration has the dhcp-range configured as "static", which
> tells dnsmasq to only give addresses to hosts which are configured with
> a static address. My guess is the "no addresses available" error is
> because dnsmasq is not recognising the client.
> 
> Set --log-dhcp and see if there's a tag called "known" in the list of
> tags, and let us know how you're configuring host addresses in dnsmasq
> to do static address allocation.
> 
>>I found the dnsmasq dhcp client id is generated by client MAC address,
>>but the dhcp server id is not generated by the binding tap
>>interface(tap1a82f5d5-e9) MAC address. Base on the server id (
>>00:03:00:01:00:0a:f7:1d:70:5c), I found it is generated by another
>>network device, the MAC address(0a:f7:1d:70:5c) is matched with eth4
>>in my env, and also eth4 device is in "inactive" status, I do not know
>>the root cause.
> 
> That's fine. The MAC address of any interface is allowed to be used,
> it's just to make sure the server-id is unique. Same for client-ids.
> 
> Cheers,
> 
> Simon.
> 
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> 
> 
> 
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