Maintained by: NLnet Labs

[Unbound-users] Unbound answering SERVFAIL

Ondřej Surý
Mon Mar 16 18:13:56 CET 2009


Hi Cédric,

does 192.168.2.2 serve . zone?

Ondrej

2009/3/16 Cédric Girard <girard.cedric at gmail.com>:
> Hello,
>
> I'm currently doing some testing on DNS. Thus my configuration is perhaps
> singular.
>
> I've an authoritative server set-up and working. This server zone is called
> "test.".
> I've tried to set up a caching server on another server with Unbound 1.2.1.
> This two servers are connected each other through a crossover cable and not
> connected to the Internet.
>
> When I try to do a dig from a client (directly connected to the caching
> server and not connected to the Internet) I get a SERVFAIL back. I must say
> that with BIND instead of Unbound and without any other changes to the
> configuration it was fully working.
>
> To have a better understanding of following files:
> - 192.168.1.1 is the client
> - 192.168.1.2 is the caching server on the client side
> - 192.168.2.1 is the caching server on the authoritative server side
> - 192.168.2.2 is the authoritative server
>
> Content of unbound.conf:
>
> server:
>         root-hints: "/root/conf/cache/db.root"
>         do-ip6: no
>         username: ""
>         verbosity: 3
>         logfile: ""
>         chroot: ""
>         module-config: "iterator"
>         access-control: 0.0.0.0/0 allow
>         port: 53
>         interface: 192.168.1.2
>         interface: 192.168.3.2
>         outgoing-interface: 192.168.2.1
>
>
> Content of db.root:
>
> ns.test.        36000   A       192.168.2.2
> .               36000   NS      ns.test.
>
>
> Log from Unbound (the request was "dig @192.168.1.2 test1.test. A")
>
> station24:~# unbound -c /etc/unbound.conf -d
> [1237215220] unbound[2605:0] debug: chdir to /usr/local/etc/unbound
> [1237215220] unbound[2605:0] debug: switching log to stderr
> [1237215220] unbound[2605:0] debug: module config: "iterator"
> [1237215220] unbound[2605:0] notice: init module 0: iterator
> [1237215220] unbound[2605:0] debug: target fetch policy for level 0 is 3
> [1237215220] unbound[2605:0] debug: target fetch policy for level 1 is 2
> [1237215220] unbound[2605:0] debug: target fetch policy for level 2 is 1
> [1237215220] unbound[2605:0] debug: target fetch policy for level 3 is 0
> [1237215220] unbound[2605:0] debug: target fetch policy for level 4 is 0
> [1237215220] unbound[2605:0] debug: Reading root hints from
> /root/conf/cache/db.root
> [1237215220] unbound[2605:0] info: DelegationPoint<.>: 1 names (1 missing),
> 0 addrs (0 result, 0 avail)
> [1237215220] unbound[2605:0] debug: cache memory msg=33040 rrset=33040
> infra=1312 val=0
> [1237215220] unbound[2605:0] info: start of service (unbound 1.2.1).
> [1237215271] unbound[2605:0] debug: iterator[module 0] operate:
> extstate:module_state_initial event:module_event_new
> [1237215271] unbound[2605:0] info: resolving <test1.test. A IN>
> [1237215271] unbound[2605:0] info: priming . IN NS
> [1237215271] unbound[2605:0] debug: iterator[module 0] operate:
> extstate:module_state_initial event:module_event_pass
> [1237215271] unbound[2605:0] info: iterator operate: query <. NS IN>
> [1237215271] unbound[2605:0] info: processQueryTargets: <. NS IN>
> [1237215271] unbound[2605:0] info: new target <ns.test. A IN>
> [1237215271] unbound[2605:0] debug: iterator[module 0] operate:
> extstate:module_state_initial event:module_event_pass
> [1237215271] unbound[2605:0] info: iterator operate: query <ns.test. A IN>
> [1237215271] unbound[2605:0] info: resolving <ns.test. A IN>
> [1237215271] unbound[2605:0] info: priming . IN NS
> [1237215271] unbound[2605:0] info: cycle detected <. NS IN>
> [1237215271] unbound[2605:0] debug: return error response REFUSED
> [1237215271] unbound[2605:0] debug: iterator[module 0] operate:
> extstate:module_wait_subquery event:module_event_pass
> [1237215271] unbound[2605:0] info: iterator operate: query <. NS IN>
> [1237215271] unbound[2605:0] info: processQueryTargets: <. NS IN>
> [1237215271] unbound[2605:0] debug: out of query targets -- returning
> SERVFAIL
> [1237215271] unbound[2605:0] debug: return error response SERVFAIL
> [1237215271] unbound[2605:0] debug: iterator[module 0] operate:
> extstate:module_wait_subquery event:module_event_pass
> [1237215271] unbound[2605:0] info: iterator operate: query <test1.test. A
> IN>
> [1237215271] unbound[2605:0] info: processQueryTargets: <test1.test. A IN>
> [1237215271] unbound[2605:0] debug: Failed to get a delegation, giving up
> [1237215271] unbound[2605:0] debug: return error response SERVFAIL
> [1237215271] unbound[2605:0] debug: cache memory msg=33141 rrset=33040
> infra=1312 val=0
>
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-- 
Ondřej Surý <ondrej at sury.org>
http://blog.rfc1925.org/