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Re: Antw: Weird DNS round-robin issue
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On 02/18/2014 12:09 PM, Ulrich Windl wrote:
> Hi!
>
> Did you read the bind manual pages about "sortlist"?
The official Bind 9 reference guide says:
"The client resolver code should rearrange the RRs
as appropriate, that is, using any addresses on the *local net* in
preference to other addresses."
That is exactly what I am experiencing :(
Thanks for the pointer!
>
> Ulrich
>
>>>> Dennis Leeuw <D.Leeuw@umcutrecht.nl> schrieb am 18.02.2014 um
>>>> 10:33 in
> Nachricht <530328F0.4090903@umcutrecht.nl>: Hi all,
>
> I hope I am on the right list for the problem I am experiencing.
>
> We have two subnets 192.168.196. 192.168.222.
>
> Our main LDAP servers run in 192.168.196. and are load-balanced by
> round-robin DNS. The 192.168.196. network is exhausted, so we added
> a new LDAP slave to 192.168.222. and added the IP address to the
> round-robin pool. But it seems that it is only used by other
> servers in the 192.168.222 network and not by servers in the
> 192.168.196. network
>
> This setup has now been running for 6 days, with nscd.conf:
> enable-cache hosts yes positive-time-to-live hosts 3600
> negative-time-to-live hosts 20 suggested-size hosts 211
> check-files hosts yes persistent hosts yes shared hosts yes
> max-db-size hosts 33554432
>
> and nslcd.conf: uid nslcd gid ldap uri
> ldap://ldap.div.ourdomain.nl/ base dc=div,dc=ourdomain,dc=nl ssl
> no tls_cacertdir /etc/openldap/cacerts
>
> The LDAP server in the 192.168.222 range serves only 33
> connections all from the 192.168.222 range, and the 2 hosts in the
> 192.168.196 range serve 599 and 706 connections. The last 2 servers
> do serve the 143.121.222. network also. So might there be some
> caching issue?
>
> $ getent ahost ldap.div.ourdomain.nl 192.168.196.190 STREAM
> ldap.div.ourdomain.nl 192.168.196.190 DGRAM 192.168.196.190 RAW
> 192.168.196.151 STREAM 192.168.196.151 DGRAM 192.168.196.151 RAW
> 192.168.222.179 STREAM 192.168.222.179 DGRAM 192.168.222.179 RAW
>
> Is this the right list for this question? And if so can someone
> help me understand what is going on?
>
> With kind regards,
>
> Dennis Leeuw
>
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