[Dnsmasq-discuss] Kind request regarding Dnsmasq's Dns response auto caching feature not working
richardvoigt at gmail.com
richardvoigt at gmail.com
Sun May 31 03:12:05 BST 2015
Because of your configuration, none of those packets are going to dnsmasq
at all. The problem is this line.
listen-address=127.0.0.1
On Sat, May 30, 2015 at 5:21 PM, Joyabrata Ghosh <joy.career at gmail.com>
wrote:
> Dear Dnsmasq Experts,
>
> Myself new to Dnsmasq and facing issues in personally evaluating Auto
> Caching feature of very popular Dnsmasq product.
>
> Followed the recommended links inline, however unable to resolve the
> caching issue, kindly share some expertise advice/pointer to resolve the
> caching problem, setup details inline:
>
>
> Thanks & Regards,
> JGhosh
> Networking developer, Bangalore, India
>
> ==
> ==
>
> references official:
> http://www.thekelleys.org.uk/dnsmasq/doc.html
> http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html
>
> references other:
> https://help.ubuntu.com/community/Dnsmasq
> http://www.cyberciti.biz/faq/caching-dns-server/
>
> http://www.georgestarcher.com/splunk-dns-lookup-performance-and-caching-with-dnsmasq/
>
> http://unix.stackexchange.com/questions/162973/how-to-measure-dns-cache-efficiency-cached-items/206403#206403
>
> http://serverfault.com/questions/695441/dnsmasqs-dns-response-auto-caching-feature-not-working
>
> http://www.devshed.com/c/a/braindump/managing-a-linux-wireless-access-point/
>
> *Problem Description:*
>
> Dnsmasq Cache and Internal Log on USR1 signal dump (when running with or
> without --no-daemon and --log-queries for analysis) it always shows: 0/0
> cache, meaning caching feature of Dnsmasq not working.
>
> It is also observed that although repetitive DNS A?(host query) and
> A(response) records are populated successfully over the same listening
> interface continuously, but cache count still remains 0.
>
> Any one having any idea how to solve/debug this Dnsmasq Cache Not Working
> problem ?
>
> Alternatively, please suggest another Ubuntu linux supported DNS Caching
> tool which can be configured for targeted interface.
>
> > **dnsmasq: cache size 150, 0/0 cache insertions re-used unexpired cache
> entries**
>
>
>
> root at host1:~# sudo pkill -USR1 dnsmasq
> dnsmasq: query[AAAA] host1 from 127.0.0.1
> dnsmasq: query[AAAA] host1 from 127.0.0.1
> dnsmasq: query[A] host1 from 127.0.0.1
> dnsmasq: query[A] host1 from 127.0.0.1
> sudo: unable to resolve host host1
> dnsmasq: time 1432979095
> dnsmasq: cache size 150, 0/0 cache insertions re-used unexpired cache
> entries.
> dnsmasq: queries forwarded 0, queries answered locally 4
> dnsmasq: Host Address Flags Expires
> dnsmasq: ip6-loopback ::1 6F I H
> dnsmasq: pep 127.0.1.1 4FRI H
> dnsmasq: ip6-mcastprefix ff00:: 6FRI H
> dnsmasq: ip6-allrouters ff02::2 6FRI H
> dnsmasq: ip6-localhost ::1 6FRI H
> dnsmasq: localhost 127.0.0.1 4FRI H
> dnsmasq: ip6-allnodes ff02::1 6FRI H
> dnsmasq: ip6-localnet fe00:: 6FRI H
> [1]- User defined signal 1 /etc/init.d/dnsmasq restart
> root at host1:~#
>
> TCPDUMP ON DNSMASQ Interface:
>
> 05:40:47.555213 IP 172.20.20.10.52592 > 172.20.20.2.53: 8856+ A?
> app.host2.com. (45)
> 05:40:47.558364 IP 172.20.20.2.53 > 172.20.20.10.52592: 8856* 1/0/0 A
> 10.60.60.190 (61)
> 05:41:52.875128 IP 172.20.20.10.60448 > 172.20.20.2.53: 11981+ A?
> app.host2.com. (45)
> 05:41:52.878377 IP 172.20.20.2.53 > 172.20.20.10.60448: 11981* 1/0/0 A
> 10.60.60.190 (61)
> 05:42:44.241724 IP 172.20.20.10.65300 > 172.20.20.2.53: 6667+ A?
> app.host2.com. (45)
> 05:42:44.244808 IP 172.20.20.2.53 > 172.20.20.10.65300: 6667* 1/0/0 A
> 10.60.60.190 (61)
>
> Dnsmasq setting: /etc/dnsmasq.conf
>
> log-facility=/var/log/dnsmasq.log
> log-queries
> log-dhcp
> no-daemon
> listen-address=127.0.0.1
> port=53
> interface=eth0
> bind-interfaces
> cache-size=1000
> neg-ttl=3600
>
> Dnsmasq Running as inline from default:
>
> root at host1:~# /etc/init.d/dnsmasq restart
> * Restarting DNS forwarder and DHCP server dnsmasq
>
> dnsmasq: started, version 2.68 cachesize 1000
> dnsmasq: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP
> DHCPv6 no-Lua TFTP conntrack ipset auth
> dnsmasq: reading /etc/resolv.conf
> dnsmasq: using nameserver 11.45.45.9#53
> dnsmasq: read /etc/hosts - 7 addresses
> User defined signal 1
> root at host1:~# dnsmasq: time 1433019086
> dnsmasq: cache size 1000, 0/0 cache insertions re-used unexpired cache
> entries.
> dnsmasq: queries forwarded 0, queries answered locally 0
> dnsmasq: queries for authoritative zones 0
> dnsmasq: Host Address
>
> Flags Expires
> dnsmasq: ip6-allnodes ff02::1
>
> 6FRI H
> dnsmasq: ip6-localnet fe00::
>
> 6FRI H
> dnsmasq: ip6-localhost ::1
>
> 6FRI H
> dnsmasq: pep 127.0.1.1
>
> 4FRI H
> dnsmasq: ip6-mcastprefix ff00::
>
> 6FRI H
> dnsmasq: localhost 127.0.0.1
>
> 4FRI H
> dnsmasq: ip6-loopback ::1
>
> 6F I H
> dnsmasq: ip6-allrouters ff02::2
>
> 6FRI H
>
> Dnsmasq process status:
>
> root at host1:~# ps aux | grep dnsmasq
> dnsmasq 23437 0.0 0.0 27636 936 ? S 16:36 0:00
> /usr/sbin/dnsmasq -x /var/run/dnsmasq/dnsmasq.pid -u dnsmasq
> -r /var/run/dnsmasq/resolv.conf -7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-
> old,.dpkg-new
>
> Dnsmasq package status:
>
> root at host1:~# dpkg -l | grep dnsmasq
> ii dnsmasq 2.68-1
> all Small caching DNS proxy
> and DHCP/TFTP server
> ii dnsmasq-base 2.68-1
> amd64 Small caching DNS proxy and
> DHCP/TFTP server
> ii dnsmasq-utils 2.68-1
> amd64 Utilities for
> manipulating DHCP leases
>
> ==
> ==
>
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>
>
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