1.7.3 - root zone transfer and resolving SLD of delegated TLD
Wouter Wijngaards
wouter at nlnetlabs.nl
Wed Nov 28 13:42:08 UTC 2018
Hi,
On 28/11/2018 13:46, ѽ҉ᶬḳ℠ via Unbound-users wrote:
> Hi Wouter,
>
> thanks for looking into it and the response. Unfortunately with the
> below setting the /second-level domain does not resolve/
It is configured to forward to the root zone that you have mirrored.
The root zone only contains delegations, so you get servfail or
referrals out of that. What you want is that it performs full recursion
with the copy of the root zone, that is the stub-zone behaviour. You
should change your config to have stub-zone for the name: "." zone and
not a forward-zone for that; or remove the forward-zone definition.
These two log lines contained the info:
debug: forwarder, ignoring referral from auth zone
debug: auth zone lookup failed, no fallback, servfail
Best regards, Wouter
>
>> auth-zone:
>> name: .
>> zonefile: /etc/unbound/root
>> for-downstream: no
>> for-upstream: yes
>> master: 198.41.0.4
>> master: 199.9.14.201
>> master: 192.33.4.12
>> master: 199.7.91.13
>> master: 192.203.230.10
>> master: 192.5.5.241
>> master: 192.112.36.4
>> master: 198.97.190.53
>> master: 192.36.148.17
>> master: 192.58.128.30
>> master: 193.0.14.129
>> master: 199.7.83.42
>> master: 202.12.27.33
>
> The debug log (unbound 1.7.3):
>
>> info: validator operate: query bbc.com. A IN
>> debug: validator: pass to next module
>> debug: mesh_run: validator module exit state is module_wait_module
>> debug: iterator[module 1] operate: extstate:module_state_initial
>> event:module_event_pass
>> debug: process_request: new external request event
>> debug: iter_handle processing q with state INIT REQUEST STATE
>> info: resolving bbc.com. A IN
>> debug: request has dependency depth of 0
>> debug: forwarding request
>> debug: iter_handle processing q with state QUERY TARGETS STATE
>> info: processQueryTargets: bbc.com. A IN
>> debug: processQueryTargets: targetqueries 0, currentqueries 0 sentcount 0
>> info: DelegationPoint<.>: 0 names (0 missing), 10 addrs (0 result, 10
>> avail) parentNS
>> info: auth_zone . query bbc.com. A, domain ns.amarshallinc.com.
>> notexact notexist, ce com., rrset NS
>> info: msg from auth zone ;; ->>HEADER<<- opcode: QUERY, rcode:
>> NOERROR, id: 0
>> ;; flags: qr ; QUERY: 1, ANSWER: 0, AUTHORITY: 15, ADDITIONAL: 26
>> ;; QUESTION SECTION:
>> bbc.com. IN A
>>
>> ;; ANSWER SECTION:
>>
>> ;; AUTHORITY SECTION:
>> com. 172800 IN NS a.gtld-servers.net.
>> com. 172800 IN NS b.gtld-servers.net.
>> com. 172800 IN NS c.gtld-servers.net.
>> com. 172800 IN NS d.gtld-servers.net.
>> com. 172800 IN NS e.gtld-servers.net.
>> com. 172800 IN NS f.gtld-servers.net.
>> com. 172800 IN NS g.gtld-servers.net.
>> com. 172800 IN NS h.gtld-servers.net.
>> com. 172800 IN NS i.gtld-servers.net.
>> com. 172800 IN NS j.gtld-servers.net.
>> com. 172800 IN NS k.gtld-servers.net.
>> com. 172800 IN NS l.gtld-servers.net.
>> com. 172800 IN NS m.gtld-servers.net.
>> com. 86400 IN DS 30909 8 2
>> E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CFC41A5766
>> com. 86400 IN RRSIG DS 8 1 86400 20181211050000
>> 20181128040000 2134 .
>> FeSgJRqqq/LY82e1pAM38Eiu07pepp53zIY23OlA65VDqA4ynhKWb8OvOKiWzHhWbM6KSs/4oXoTPMKn9x3EiWR0L170uKLloALiqbiVi9hJf/fYyRQB9QQPgxUqkkUnDdU7+zfK78BjBlEXgjd+5SfNiE32WKU9i5bP8crQg7J7tC/9FQwcn+eh/kz6pUJ5NVBG6YKkG2Y8YYCsOusOpa67WiRk3bf7DwJUAV6zD6v16TLr0GZesXokZbiwdIqPeJVjLumzLFxVHa+agDb3G2kv2qIjpFw7VPl1Nh/nADyJLdk6tvH5V9xu3MbkUgNcQeAoQG+BrEoRr7xfjKJhTA==
>> ;{id = 2134}
>>
>> ;; ADDITIONAL SECTION:
>> a.gtld-servers.net. 172800 IN A 192.5.6.30
>> a.gtld-servers.net. 172800 IN AAAA 2001:503:a83e::2:30
>> b.gtld-servers.net. 172800 IN A 192.33.14.30
>> b.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30
>> c.gtld-servers.net. 172800 IN A 192.26.92.30
>> c.gtld-servers.net. 172800 IN AAAA 2001:503:83eb::30
>> d.gtld-servers.net. 172800 IN A 192.31.80.30
>> d.gtld-servers.net. 172800 IN AAAA 2001:500:856e::30
>> e.gtld-servers.net. 172800 IN A 192.12.94.30
>> e.gtld-servers.net. 172800 IN AAAA 2001:502:1ca1::30
>> f.gtld-servers.net. 172800 IN A 192.35.51.30
>> f.gtld-servers.net. 172800 IN AAAA 2001:503:d414::30
>> g.gtld-servers.net. 172800 IN A 192.42.93.30
>> g.gtld-servers.net. 172800 IN AAAA 2001:503:eea3::30
>> h.gtld-servers.net. 172800 IN A 192.54.112.30
>> h.gtld-servers.net. 172800 IN AAAA 2001:502:8cc::30
>> i.gtld-servers.net. 172800 IN A 192.43.172.30
>> i.gtld-servers.net. 172800 IN AAAA 2001:503:39c1::30
>> j.gtld-servers.net. 172800 IN A 192.48.79.30
>> j.gtld-servers.net. 172800 IN AAAA 2001:502:7094::30
>> k.gtld-servers.net. 172800 IN A 192.52.178.30
>> k.gtld-servers.net. 172800 IN AAAA 2001:503:d2d::30
>> l.gtld-servers.net. 172800 IN A 192.41.162.30
>> l.gtld-servers.net. 172800 IN AAAA 2001:500:d937::30
>> m.gtld-servers.net. 172800 IN A 192.55.83.30
>> m.gtld-servers.net. 172800 IN AAAA 2001:501:b1f9::30
>> ;; MSG SIZE rcvd: 1156
>>
>> debug: forwarder, ignoring referral from auth zone
>> debug: auth zone lookup failed, no fallback, servfail
>> debug: return error response SERVFAIL
>> debug: mesh_run: iterator module exit state is module_finished
>> debug: validator[module 0] operate: extstate:module_wait_module
>> event:module_event_moddone
>> info: validator operate: query bbc.com. A IN
>> debug: validator: nextmodule returned
>> debug: cannot validate non-answer, rcode SERVFAIL
>> debug: mesh_run: validator module exit state is module_finished
>> debug: query took 0.000000 sec
>> info: mesh_run: end 0 recursion states (0 with reply, 0 detached), 0
>> waiting replies, 13 recursion replies sent, 0 replies dropped, 0
>> states jostled out
>
> Tried on another node with unbound 1.8.1
>
>> info: subnet operate: query cnn.com. A IN
>> debug: subnet: not found in cache. pass to next module
>> debug: mesh_run: subnet module exit state is module_wait_module
>> debug: validator[module 1] operate: extstate:module_state_initial
>> event:module_event_pass
>> info: validator operate: query cnn.com. A IN
>> debug: validator: pass to next module
>> debug: mesh_run: validator module exit state is module_wait_module
>> debug: iterator[module 2] operate: extstate:module_state_initial
>> event:module_event_pass
>> debug: process_request: new external request event
>> debug: iter_handle processing q with state INIT REQUEST STATE
>> info: resolving cnn.com. A IN
>> debug: request has dependency depth of 0
>> debug: forwarding request
>> debug: iter_handle processing q with state QUERY TARGETS STATE
>> info: processQueryTargets: cnn.com. A IN
>> debug: processQueryTargets: targetqueries 0, currentqueries 0 sentcount 0
>> info: DelegationPoint<.>: 0 names (0 missing), 10 addrs (0 result, 10
>> avail) parentNS
>> info: auth_zone . query cnn.com. A, domain
>> ns-tld5.charlestonroadregistry.com. notexact notexist, ce com., rrset NS
>> [1543408434] unbound[28177:2] info: msg from auth zone ;;
>> ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 0
>> ;; flags: qr ; QUERY: 1, ANSWER: 0, AUTHORITY: 15, ADDITIONAL: 26
>> ;; QUESTION SECTION:
>> cnn.com. IN A
>>
>> ;; ANSWER SECTION:
>>
>> ;; AUTHORITY SECTION:
>> com. 172800 IN NS a.gtld-servers.net.
>> com. 172800 IN NS b.gtld-servers.net.
>> com. 172800 IN NS c.gtld-servers.net.
>> com. 172800 IN NS d.gtld-servers.net.
>> com. 172800 IN NS e.gtld-servers.net.
>> com. 172800 IN NS f.gtld-servers.net.
>> com. 172800 IN NS g.gtld-servers.net.
>> com. 172800 IN NS h.gtld-servers.net.
>> com. 172800 IN NS i.gtld-servers.net.
>> com. 172800 IN NS j.gtld-servers.net.
>> com. 172800 IN NS k.gtld-servers.net.
>> com. 172800 IN NS l.gtld-servers.net.
>> com. 172800 IN NS m.gtld-servers.net.
>> com. 86400 IN DS 30909 8 2
>> E2D3C916F6DEEAC73294E8268FB5885044A833FC5459588F4A9184CFC41A5766
>> com. 86400 IN RRSIG DS 8 1 86400 20181211050000
>> 20181128040000 2134 .
>> FeSgJRqqq/LY82e1pAM38Eiu07pepp53zIY23OlA65VDqA4ynhKWb8OvOKiWzHhWbM6KSs/4oXoTPMKn9x3EiWR0L170uKLloALiqbiVi9hJf/fYyRQB9QQPgxUqkkUnDdU7+zfK78BjBlEXgjd+5SfNiE32WKU9i5bP8crQg7J7tC/9FQwcn+eh/kz6pUJ5NVBG6YKkG2Y8YYCsOusOpa67WiRk3bf7DwJUAV6zD6v16TLr0GZesXokZbiwdIqPeJVjLumzLFxVHa+agDb3G2kv2qIjpFw7VPl1Nh/nADyJLdk6tvH5V9xu3MbkUgNcQeAoQG+BrEoRr7xfjKJhTA==
>> ;{id = 2134}
>>
>> ;; ADDITIONAL SECTION:
>> a.gtld-servers.net. 172800 IN A 192.5.6.30
>> a.gtld-servers.net. 172800 IN AAAA 2001:503:a83e::2:30
>> b.gtld-servers.net. 172800 IN A 192.33.14.30
>> b.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30
>> c.gtld-servers.net. 172800 IN A 192.26.92.30
>> c.gtld-servers.net. 172800 IN AAAA 2001:503:83eb::30
>> d.gtld-servers.net. 172800 IN A 192.31.80.30
>> d.gtld-servers.net. 172800 IN AAAA 2001:500:856e::30
>> e.gtld-servers.net. 172800 IN A 192.12.94.30
>> e.gtld-servers.net. 172800 IN AAAA 2001:502:1ca1::30
>> f.gtld-servers.net. 172800 IN A 192.35.51.30
>> f.gtld-servers.net. 172800 IN AAAA 2001:503:d414::30
>> g.gtld-servers.net. 172800 IN A 192.42.93.30
>> g.gtld-servers.net. 172800 IN AAAA 2001:503:eea3::30
>> h.gtld-servers.net. 172800 IN A 192.54.112.30
>> h.gtld-servers.net. 172800 IN AAAA 2001:502:8cc::30
>> i.gtld-servers.net. 172800 IN A 192.43.172.30
>> i.gtld-servers.net. 172800 IN AAAA 2001:503:39c1::30
>> j.gtld-servers.net. 172800 IN A 192.48.79.30
>> j.gtld-servers.net. 172800 IN AAAA 2001:502:7094::30
>> k.gtld-servers.net. 172800 IN A 192.52.178.30
>> k.gtld-servers.net. 172800 IN AAAA 2001:503:d2d::30
>> l.gtld-servers.net. 172800 IN A 192.41.162.30
>> l.gtld-servers.net. 172800 IN AAAA 2001:500:d937::30
>> m.gtld-servers.net. 172800 IN A 192.55.83.30
>> m.gtld-servers.net. 172800 IN AAAA 2001:501:b1f9::30
>> ;; MSG SIZE rcvd: 1156
>>
>> debug: forwarder, ignoring referral from auth zone
>> debug: auth zone lookup failed, no fallback, servfail
>> debug: return error response SERVFAIL
>> debug: mesh_run: iterator module exit state is module_finished
>> debug: validator[module 1] operate: extstate:module_wait_module
>> event:module_event_moddone
>> info: validator operate: query cnn.com. A IN
>> debug: validator: nextmodule returned
>> debug: cannot validate non-answer, rcode SERVFAIL
>> debug: mesh_run: validator module exit state is module_finished
>> debug: subnet[module 0] operate: extstate:module_wait_module
>> event:module_event_moddone
>> info: subnet operate: query cnn.com. A IN
>> debug: mesh_run: subnet module exit state is module_finished
>> debug: query took 0.000000 sec
>> info: mesh_run: end 0 recursion states (0 with reply, 0 detached), 0
>> waiting replies, 21 recursion replies sent, 0 replies dropped, 0
>> states jostled out
>
> On 26.11.2018 09:57, Wouter via Unbound-users wrote:
>> Hi,
>>
>> On 10/28/18 7:08 PM, ѽ҉ᶬḳ℠ via Unbound-users wrote:
>>>> the following configuration is known to work with unbound 1.8.x
>>> Seems it does not make a difference whether it is 1.7.3 or 1.8.x
>>>
>>>> auth-zone:
>>>> name: "."
>>> The syntax *""* for *name: *is not stipulated in the online
>>> documentation, that is for *auth-zone:*. Why is it being used then?
>>> unbound-checkconf does not report an error either way, i.e. whether it
>>> reads *name: "."* or *name: .*, and the outcome of the query is the same.
>>>
>>>> for-downstream: no
>>> That does not make sense to me considering the purpose of transferring
>>> the root zone-> "If enabled, unbound serves authority responses to
>>> downstream clients for this zone. This option /makes unbound
>>> behave/, for the queries with names in this zone,/like one of the
>>> authority servers for that zone/."
>> You need the for-downstream: no setting. Because unbound has to be a
>> mirror for looking up root zone information in the contents. It has the
>> information, but is not a copy of a root server to its clients, but uses
>> the information as a copy of the root server information for its own
>> purposes. Subtly different in wording, but very different in responses.
>>
>> With for-downstream: yes, you got a referral for .com when queries for
>> somename.com. And that is exactly what that option does, serve a copy
>> of that zone.
>>
>> With for-downstream: no (and for-upstream: yes), unbound should use the
>> information when recursing to answer user queries. It uses it in
>> preference to making internet queries, and this means it uses the local
>> copy to speed up the look ups. That seems to be the option you wanted.
>>
>>> Setting it to *no* is defeating that purpose as a query does not resolve
>>> the SLD either:
>> This does not work either? Is that because you turned off for-upstream
>> with for-upstream: no? It should be working, with for-downstream: no
>> and for-upstream: yes, I wonder what went wrong. If the config fixes do
>> not work for you could you tell me the verbose log of that lookup? The
>> first result (the .com referral answer you got) tells me that mostly
>> things a fine, the zone is loaded and data is looked up correctly. But
>> I thought this would have worked?
>>
>> Best regards, Wouter
>>
>>>> # dig bbc.com
>>>>
>>>> ; <<>> DiG 9.11.2-P1 <<>> bbc.com
>>>> ;; global options: +cmd
>>>> ;; Got answer:
>>>> ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 34029
>>>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
>>>>
>>>> ;; OPT PSEUDOSECTION:
>>>> ; EDNS: version: 0, flags:; udp: 4096
>>>> ;; QUESTION SECTION:
>>>> ;bbc.com. IN A
>>>>
>>>> ;; Query time: 5 msec
>>>> ;; SERVER: 127.0.0.1#53(127.0.0.1)
>>>> ;; WHEN: Sun Oct 28 18:40:37 CET 2018
>>>> ;; MSG SIZE rcvd: 36
>>>> for-upstream: yes
>>> According to the online documentation this is a default setting and thus
>>> redundant to my understanding.
>>>
>>>
>>>> fallback-enabled: yes
>>> Only then the SLD resolves but that renders the transfer of the root
>>> zone redundant, i.e. means there is no apparent benefit/advantage of
>>> having a local the root zone with its delegated TLDs.
>>>
>>> The purpose of featuring a local copy of the root zone was that TLD
>>> queries are served locally rather than generating upstream queries to
>>> the NS of the TLD and thus mitigating the amount of upstream queries to
>>> authoritative servers and speed up lookups but also to enhance privacy
>>> for client queries.
>>>
>>>
>
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