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From Rafael Weingartner <rafaelweingart...@gmail.com>
Subject Re: DNS service on VR not responding
Date Sun, 20 Jul 2014 17:17:11 GMT
Good day to you too,
Sure I guess I point a way, so you can start troubleshooting.


   1. Check if the VMs can reach the VR.
   2. Check if the VMs are really configured to use VR as the DNS server.
   3. Change the DNS server to be any other such as 8.8.8.8 and 8.8.4.4
   (just to see if there is nothing blocking the way), the name resolution
   should work with those servers.
   4. Enable the dnsmasq debug, and try to see if something interesting
   appears in dnsmasq.log.




On Sun, Jul 20, 2014 at 2:06 PM, Indra Pramana <indra@sg.or.id> wrote:

> Hi Rafael,
>
> Good day to you, and thank you for your reply.
>
> Can't find anything wrong on dnsmasq.log / daemon.log, just some log
> entries related to DHCP, nothing on DNS. I masked the IP addresses since
> they are public.
>
> ===
> Jul 20 16:21:51 r-2606-VM dnsmasq[3519]: DHCPDISCOVER(eth0) X.X.X.X
> 06:62:a8:01:13:37
> Jul 20 16:21:51 r-2606-VM dnsmasq[3519]: DHCPOFFER(eth0) X.X.X.X
> 06:62:a8:01:13:37
> Jul 20 16:21:51 r-2606-VM dnsmasq[3519]: DHCPREQUEST(eth0) X.X.X.X
> 06:62:a8:01:13:37
> Jul 20 16:21:51 r-2606-VM dnsmasq[3519]: DHCPACK(eth0) X.X.X.X
> 06:62:a8:01:13:37 yyyyyy
> Jul 20 16:23:53 r-2606-VM dnsmasq[3519]: DHCPINFORM(eth0) X.X.X.X
> 06:43:4a:01:12:65
> Jul 20 16:23:53 r-2606-VM dnsmasq[3519]: DHCPACK(eth0) X.X.X.X
> 06:43:4a:01:12:65 zzzzzz
> ===
>
> Yes, the guest VMs are having difficulties resolving domains into IP
> addresses because of the problem on the VR's DNS server.
>
> $ host www.google.com X.X.X.X (where X.X.X.X is the IP address of the VR)
> ;; connection timed out; no servers could be reached
>
> However, from within the VR, I am able to resolve domains just fine.
>
> Any advise where can I start troubleshooting this?
>
> Looking forward to your reply, thank you.
>
> Cheers.
>
>
>
> On Sun, Jul 20, 2014 at 11:26 PM, Rafael Weingartner <
> rafaelweingartner@gmail.com> wrote:
>
> > Have you taken a look at dnsmasq.log in the VR ?
> > What do you mean with not responding? The addresses are not being
> resolved
> > to ip addresses?
> >
> >
> > On Sun, Jul 20, 2014 at 11:53 AM, Indra Pramana <indra@sg.or.id> wrote:
> >
> > > Dear all,
> > >
> > > All our guest VMs are having our virtual router (VR)'s IP address on
> > > /etc/resolv.conf. In the past two weeks, I just realised that the DNS
> > > service on the VR is not working, and doesn't respond to DNS queries
> from
> > > the DNS clients on the guest VM.
> > >
> > > I have tried to stop and start back the VR, but the problem persists.
> > >
> > > DHCP services seems to be running fine, only DNS services are not
> > working.
> > > From what I understand, both services are provided by dnsmasq, correct?
> > >
> > > Any advice on how can I resolve the problem?
> > >
> > > Looking forward to your reply, thank you.
> > >
> > > Cheers.
> > >
> >
> >
> >
> > --
> > Rafael Weingärtner
> >
>



-- 
Rafael Weingärtner

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