Re: Problem with NetBSd 5.1.2 / gethostbyname / nsswitch.conf or bind resolving chain of multiple cnames

[christos%astron.com@localhost (Christos Zoulas)]

In article 
<CAHKF-Au2FEVpEtG=fH0-W2KXGeGrSBzQkc4ZmYU=DX87mcFTdg%mail.gmail.com@localhost>,
matthew sporleder  <msporleder%gmail.com@localhost> wrote:
>On Sun, Sep 9, 2012 at 11:25 AM, matthew sporleder 
><msporleder%gmail.com@localhost> wrote:
>> On Sun, Sep 9, 2012 at 5:43 AM, thilo <thilo%nispuk.com@localhost> wrote:
>>> Hello everyone,
>>>
>>> I have an issue with my name resolving and I am not sure where the
>>> problem lies:
>>>
>>> On my server I can resolve an address with multiple cnames via nslookup
>>> to my local bind server.
>>> The clibrary gethostbyname  fails the lookup if the cname chain is
>>> greater than 2.
>>> I cannot seem to find anywhere a switch/define that would limit the
>>> number of recursive lookups.
>>>
>>> Changing the order in /etc/nsswitch.conf from     "files dns"  -> "dns
>>> file" changes the herror output from
>>> "Unknown server error" -> "Unknown host".
>>> Interesting enough windows and linux clients in my network do not have
>>> this problem, but another netbsd box does too.
>>>
>>> Does someone know what is wrong in my configuration?
>>> Thanks for the help
>>>  thilo
>>>
>>>
>>> == log from various tools  ==
>>> -bash-4.2$ nslookup dradio_mp3_dkultur_m.akacast.akamaistream.net
>>> Server:         127.0.0.1
>>> Address:        127.0.0.1#53
>>>
>>> Non-authoritative answer:
>>> dradio_mp3_dkultur_m.akacast.akamaistream.net   canonical name =
>>> out.icecast.akadns.net.
>>> out.icecast.akadns.net  canonical name = eu.ic.akadns.net.
>>> eu.ic.akadns.net        canonical name = edge13647.icecast.akadns.net.
>>> Name:   edge13647.icecast.akadns.net
>>> Address: 195.27.154.158
>>>
>>> ====== PING FIRST HOST==================================
>>> -bash-4.2$ ping -c 1  dradio_mp3_dkultur_m.akacast.akamaistream.net
>>> ping: Cannot resolve "dradio_mp3_dkultur_m.akacast.akamaistream.net"
>>> (Unknown host)
>>> ====== PING SECOND HOST==================================
>>> -bash-4.2$ ping -c 1 out.icecast.akadns.net
>>> PING edge14152.icecast.akadns.net (195.10.36.180): 56 data bytes
>>> 64 bytes from 195.10.36.180: icmp_seq=0 ttl=59 time=63.583 ms
>>>
>>> ----edge14152.icecast.akadns.net PING Statistics----
>>> 1 packets transmitted, 1 packets received, 0.0% packet loss
>>> round-trip min/avg/max/stddev = 63.583/63.583/63.583/0.000 ms
>>> =========UNAME=======================================
>>> -bash-4.2$ uname -a
>>> NetBSD maggi 5.1.2 NetBSD 5.1.2 (GENERIC) #0: Thu Feb  2 12:12:28 UTC
>>> 2012
>>>
>builds%b7.netbsd.org@localhost:/home/builds/ab/netbsd-5-1-2-RELEASE/amd64/201202021012Z-obj/home/builds/ab/netbsd-5-1-2-RELEASE/src/sys/arch/amd64/compile/GENERIC
>>> amd64
>>>
>>> ============= NAMED versions =============
>>> I tried bind 9.7.3 and 9.9.1 :
>>> -bash-4.2$ /usr/sbin/named -v
>>> BIND 9.7.3-P3
>>> -bash-4.2$  /usr/pkg/sbin/named -v
>>> BIND 9.9.1-P2
>>> -bash-4.2$
>>>
>>> ================================
>>
>>
>> This is true on my box too.
>>
>> getent hosts dradio_mp3_dkultur_m.akacast.akamaistream.net
>
>This is an issue with netbsd resolving hosts with _ (underscore) in the name.

Yes, cvs update, build and then "options no-check-names" in resolv.conf.

christos