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Re: [lvs-users] DNS not working

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] DNS not working
Cc: Neil Aggarwal <neil@xxxxxxxxxxxxxxxxxx>
From: David Coulson <david@xxxxxxxxxxxxxxxx>
Date: Mon, 11 Apr 2011 11:02:55 -0400
Is your named service listening on 204.61.221.44:53?

David

On 4/11/11 10:55 AM, Neil Aggarwal wrote:
> Hello:
>
> I have a DNS server running on my load balancer.
> I have ldirectord set up to send incoming requests
> on the virtual IP to it.
>
> Here is my ldirectord.cf entry:
>
> # DNS Service
> virtual=204.61.221.44:53
>          real=127.0.0.1:53 masq
>          service=dns
>          scheduler=wlc
>          protocol=udp
>          checkport=53
>          request="sandalisland.com"
>          receive="204.61.221.44"
>
> ipvsadm -L -n gives me this:
>
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Scheduler Flags
>    ->  RemoteAddress:Port           Forward Weight ActiveConn InActConn
> UDP  204.61.221.44:53 wlc
>    ->  127.0.0.1:53                 Local   1      0          0
>
> > From the load balancer, dns queries work fine.
> Both of these give me a response:
> dig @204.61.221.44 sandalisland.com
> dig @127.0.0.1 sandalisland.com
>
> But, when I go to a remote server to try the
> dig on 204.61.221.44, it can't connect to the server:
>
> ;<<>>  DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2<<>>  @204.61.221.44
> sandalisland.com
> ; (1 server found)
> ;; global options:  printcmd
> ;; connection timed out; no servers could be reached
>
> I checked the firewalls.  I don't think it is that.
> Also, the remote machine can perform a dig on the
> public IP of the load balancer and get a response.
>
> DNS seems to work when I restart the machine, but then
> stops working after I leave it alone for a long time.
>
> Any ideas what is happening here?
>
> Thanks,
>       Neil
>
> --
> Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net/centos
> Virtual private server with CentOS 5.5 preinstalled
> Unmetered bandwidth = no overage charges
>
>
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>
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