[Dnsmasq-discuss] Long nslookup times

[Geert Stappers]

On Wed, Feb 21, 2018 at 05:03:34PM +0000, Donald Muller wrote:
> bounces at lists.thekelleys.org.uk] On Behalf Of Geert Stappers
> Sent: Wednesday, January 31, 2018 5:33 PM
> > On Wed, Jan 31, 2018 at 04:44:03PM +0000, Donald Muller wrote:
> > > bounces at lists.thekelleys.org.uk] On Behalf Of Geert Stappers
> > > Sent: Wednesday, January 31, 2018 4:56 AM
> > > > On Wed, Jan 31, 2018 at 10:22:53AM +0100, Geert Stappers wrote:
> > > > > On Tue, Jan 30, 2018 at 05:08:05PM +0000, Donald Muller wrote:
> > > > > >
> > > > > > Using Microsoft DNS server
> > > > > > [~] # time nslookup www.microsoft.com 192.168.22.200 Address 1:
> > > > > > 192.168.22.200 djmfs1.djmuller.com
> > > > >
> > > > > Programm nslookup did a reverse lookup on used DNS address and got
> > > > > back a FQDN
> > > > >
> > > > > > Using dnsmasq
> > > > > > [~] # time nslookup www.microsoft.com 192.168.22.220 Address 1:
> > > > > > 192.168.22.220 DJMFS2
> > > > >
> > > > > Non Fully Qualified Domain Name for the used DNS address
> > > > >
> > > > > >
> > > > > > real    0m40.057s
> > > > >
> > > > > Wow, a full forty seconds ...
> > > > >
> > 
> > I'm not convinced that the culprit is in  dnsmasq.
> > Please continue to find proof  ...
> > 
> > > > > > What additional information do you need?
> > > > > The connection between the r2012 server and the router.
> > > > > The connection between the dnsmasq and the router.
> > > > And
> > > > the connection between the nslookup client and the r2012 server the
> > > > connection between the nslookup client and the dnsmasq server
> > > All devices, including the router, are connected at 1GB to a switch.
> > 
> > The testclient what does it have in /etc/resolv.conf while testing?
> > Other tools for `nslookup`, such as `dig` and `host`, what timing results have
> > those?
> > The QNAP NAS with dnsmasq, how much traffic must it handle?
> 
> The test client has the following in reslov.conf
> 
> [~] # cat /etc/resolv.conf
> nameserver 192.168.22.220
> nameserver 192.168.22.242
> 
> host shows the following:
> 
> [~] # time host www.microsoft.com 192.168.22.220
> Using domain server:
> Name: 192.168.22.220
> Address: 192.168.22.220#53
> Aliases:
> 
> www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
> www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
> www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dspb.akamaiedge.net.
> e13678.dspb.akamaiedge.net has address 104.88.47.193
> e13678.dspb.akamaiedge.net has IPv6 address 2001:418:143c:19e::356e
> e13678.dspb.akamaiedge.net has IPv6 address 2001:418:143c:1a9::356e
> 
> real    0m0.050s
> user    0m0.001s
> sys     0m0.001s
> 
> dig is not installed.
> 
> The QNAP NAS is not handling much traffic. If is a home file server with minimal traffic.
> 
> I also set up dnsmasq on a second NAS with just DNS running, no DHCP. This NAS is used for backups so normally has no traffic. I get the same long times
> 
> [~] # time nslookup www.microsoft.com 192.168.22.242
> Server:    192.168.22.242
> Address 1: 192.168.22.242 djmfs3.djmuller.com
> 
> Name:      www.microsoft.com
> Address 1: 104.88.47.193 a104-88-47-193.deploy.static.akamaitechnologies.com
> Address 2: 2001:418:143c:19e::356e
> Address 3: 2001:418:143c:1a9::356e
> 
> real    0m40.071s
> user    0m0.000s
> sys     0m0.001s
> 
> What times do you get if you do a nslookup on www.microsoft.com?

| $ time nslookup www.microsoft.com 172.24.0.7
| Server:		172.24.0.7
| Address:	172.24.0.7#53
| 
| Non-authoritative answer:
| www.microsoft.com	canonical name = www.microsoft.com-c-3.edgekey.net.
| www.microsoft.com-c-3.edgekey.net	canonical name = www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
| www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net	canonical name = e13678.dspb.akamaiedge.net.
| Name:	e13678.dspb.akamaiedge.net
| Address: 104.73.152.80
| 
| 
| real	0m0,261s
| user	0m0,006s
| sys	0m0,006s
| $ time host www.microsoft.com 172.24.0.7
| Using domain server:
| Name: 172.24.0.7
| Address: 172.24.0.7#53
| Aliases: 
| 
| www.microsoft.com is an alias for www.microsoft.com-c-3.edgekey.net.
| www.microsoft.com-c-3.edgekey.net is an alias for www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net.
| www.microsoft.com-c-3.edgekey.net.globalredir.akadns.net is an alias for e13678.dspb.akamaiedge.net.
| e13678.dspb.akamaiedge.net has address 104.73.152.80
| e13678.dspb.akamaiedge.net has IPv6 address 2a02:26f0:f4:196::356e
| e13678.dspb.akamaiedge.net has IPv6 address 2a02:26f0:f4:19f::356e
| 
| real	0m0,096s
| user	0m0,008s
| sys	0m0,004s