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

[matthew sporleder <msporleder%gmail.com@localhost>]

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.