[Dnsmasq-discuss] DHCPv6 hostname resolving
Simon Kelley
simon at thekelleys.org.uk
Thu Apr 3 18:38:51 UTC 2014
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On 03/04/14 16:47, Quintus wrote:
> Hi Simon,
>
> Am 02.04.2014 20:34, schrieb Simon Kelley:
>> Please could you do the following?
>>
>> 1) Check the dnsmasq leases file (normally
>> /var/lib/misc/dnsmasq.leases) to see if the name "atlantis"
>> appears in the relevant DHCPv6 lease?
>
> It only appears for DHCPv4 leases, but not DHCPv6 ones. Here?s the
> full contents of the lease file: http://pastie.org/8991576
OK, that explains why no hostname resolution. I can also explain why
the name is not being associated with the lease, it's because you're
asking a temporary address lease.
I'm not entirely sure why naming is disabled for temporary address
leases. I probably thought that it's inherently not sensible to give
emphemeral and ever-changing addresses entries in the DNS.
Certainly, if there's no other reason not to, you can solve this
problem by reconfiguring your client to ask for a non-temporary address.
Cheers,
Simon.
>
>> 2) See if the plain name (not FQDN) resolves
>>
>> dig atlantis AAAA
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis AAAA ;; global options: +cmd ;; Got answer: ;;
> ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13397 ;; flags: qr
> rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;atlantis. IN AAAA
>
> ;; Query time: 1 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:31:02 2014 ;; MSG SIZE rcvd: 26
> -----------------------------------------
>
>> 3) See if atlantis.internal.xxx.eu resolves.
>>
>> dig atlantis.internal.xxx.eu AAAA
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.internal.xxx.eu AAAA ;; global options: +cmd ;; Got
> answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 55319
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL:
> 0
>
> ;; QUESTION SECTION: ;atlantis.internal.xxx.eu. IN AAAA
>
> ;; AUTHORITY SECTION: xxx.eu. 2560 IN SOA ns.yyy.de.
> hostmaster.xxx.eu. 1391783412 16384 2048 1048576 2560
>
> ;; Query time: 56 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;;
> WHEN: Thu Apr 3 17:35:04 2014 ;; MSG SIZE rcvd: 124
> -----------------------------------------
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.cable.internal.xxx.eu AAAA ;; global options: +cmd ;; Got
> answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33135
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0,
> ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4000 ;;
> QUESTION SECTION: ;atlantis.cable.internal.xxx.eu. IN AAAA
>
> ;; Query time: 100 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;;
> WHEN: Thu Apr 3 17:31:22 2014 ;; MSG SIZE rcvd: 75
> -----------------------------------------
>
> Normal A records resolve just fine.
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis A ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<-
> opcode: QUERY, status: NOERROR, id: 31147 ;; flags: qr aa rd ra ad;
> QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;atlantis. IN A
>
> ;; ANSWER SECTION: atlantis. 0 IN A 10.37.59.42
>
> ;; Query time: 9 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:30:55 2014 ;; MSG SIZE rcvd: 42
> -----------------------------------------
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.cable.internal.xxx.eu A ;; global options: +cmd ;; Got
> answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10528
> ;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0,
> ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;atlantis.cable.internal.xxx.eu. IN A
>
> ;; ANSWER SECTION: atlantis.cable.internal.xxx.eu. 0 IN A
> 10.37.59.42
>
> ;; Query time: 1 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:31:15 2014 ;; MSG SIZE rcvd: 80
> -----------------------------------------
>
> This one (of course) does not:
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.internal.xxx.eu A ;; global options: +cmd ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 27999 ;;
> flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;atlantis.internal.xxx.eu. IN A
>
> ;; AUTHORITY SECTION: xxx.eu. 2389 IN SOA ns.yyy.de.
> hostmaster.xxx.eu. 1391783412 16384 2048 1048576 2560
>
> ;; Query time: 35 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;;
> WHEN: Thu Apr 3 17:37:54 2014 ;; MSG SIZE rcvd: 124
> -----------------------------------------
>
> I have however discovered a strange thing. If I send the same
> queries from another computer (which is in the same subnet and
> domain), dnsmasq doesn?t resolve the unqualified name:
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> altantis A ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<-
> opcode: QUERY, status: NOERROR, id: 34618 ;; flags: qr rd ra;
> QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;altantis. IN A
>
> ;; Query time: 1 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:39:40 2014 ;; MSG SIZE rcvd: 26
> -----------------------------------------
>
> The FQDN is OK:
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.cable.internal.xxx.eu A ;; global options: +cmd ;; Got
> answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6200 ;;
> flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0,
> ADDITIONAL: 0
>
> ;; QUESTION SECTION: ;atlantis.cable.internal.xxx.eu. IN A
>
> ;; ANSWER SECTION: atlantis.cable.internal.xxx.eu. 0 IN A
> 10.37.59.42
>
> ;; Query time: 1 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:39:53 2014 ;; MSG SIZE rcvd: 80
> -----------------------------------------
>
> And this one errors as expected:
>
> ----------------------------------------- ; <<>> DiG 9.9.2-P2 <<>>
> atlantis.internal.xxx.eu A ;; global options: +cmd ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 54270 ;;
> flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL:
> 0
>
> ;; QUESTION SECTION: ;atlantis.internal.xxx.eu. IN A
>
> ;; Query time: 1 msec ;; SERVER: 10.37.59.2#53(10.37.59.2) ;; WHEN:
> Thu Apr 3 17:40:06 2014 ;; MSG SIZE rcvd: 58
> -----------------------------------------
>
> AAAA records are never resolved.
>
>> Cheers,
>>
>> Simon.
>
> Vale, Quintus
>
>
>
> _______________________________________________ Dnsmasq-discuss
> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk
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>
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