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As speed Internet surfing with a local DNS cache with dnsmasq

To speed up web browsing, speeding up the name resolution will create a local DNS cache, we will install dnsmasq DNS Server will use as our network, we can also install dnsmasq on our team and use it as a "single user"

Server Configuration

apt-get install dnsmasq

To avoid losing your settings of "manufacture" of dnsmasq will make a copy of the configuration file of the program

cp / etc / dnsmasq.conf / etc / dnsmasq.conf.original

Edit the configuration file and we like the following example of basic configuration of dnsmasq

nano / etc / dnsmasq.conf

# port that will operate the service
port = 53 # this will
dnsmasq say, not to pass higher servers,
# names without periods, or part domain, thus avoiding the burden
# unnecessary on dns servers root.
domain-needed
# This will prevent the re-shipment to the main DNS server
# address space without routing
bogus-priv # Size
domain ip address to be stored in cache
cache-size = 1000 #
will use DNS to resolve names dnsmasq
; resolv-file = / etc / dnsmasq-servers-parent

Editarmos the DNS Hosts file to use dnsmasq

nano / etc / dnsmasq-servers-parent

and write the main DNS that we use, the format is identical to the file "/ etc / resolv.conf "

nameserver 8.8.8.8 nameserver 4.2.2.2


it is finished, edit the file" / etc / resolv.conf "and delete all servers DNS and leave a line like this:

nano / etc / resolv.conf


nameserver 127.0.0.1 Now, we configure our computer to use it as a DNS server, we do this by copying the following line in the file "/ etc/dhcp3/dhclient.conf "

nano / etc / resolv.conf
prepend domain-name-servers 127.0.0.1;

With everything configured, restart the dnsmasq

, / etc / init.d / dnsmasq restart

In the client computers, we replace the servers name displayed in the file "/ etc / resolv.conf" with the IP of our new Local DNS Server

For example:

nano / etc / resolv.conf
; namserver

192.168.1.2 to verify that we are using the new server, do a check using the command "dig" dig google.es

and would

that if a response something like the following:

, \u0026lt;\u0026lt;>> DiG 9.7.0-P1 \u0026lt;\u0026lt;>> google.es
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60378
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;google.es.            IN    A

;; ANSWER SECTION:
google.es.        142    IN    A    74.125.230.80
google.es.        142    IN    A    74.125.230.81
google.es.        142    IN    A    74.125.230.83
google.es.        142    IN    A    74.125.230.82
google.es.        142    IN    A    74.125.230.84

;; Query time: 39 msec
;; SERVER: 192.168.1.2#53(192.168.1.2)
;; WHEN: Tue Jan 11 11:09:02 2011
;; MSG SIZE rcvd: 107

and as you can see the lines of "SERVER" We are using it as local DNS server to our server and not an external DNS .

Based on the HowTo's from Go2Linux and Linux Guide

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