I have created an installer for Linux DNS dig utility for Windows x64. it is extracted from BIND 9.10.2.x64.
It installs dig into system32 folder of Windows so it is already included in PATH and can be invoked from anywhere in command prompt.
Download : DIG_9.10.2.x64
Lets check microsoft.com NS glue records by dig command.
As it is a .com domain first we should check root servers for .com by the following command :
dig NS com
Result :
com. 22124 IN NS d.gtld-servers.net. com. 22124 IN NS f.gtld-servers.net. com. 22124 IN NS a.gtld-servers.net. com. 22124 IN NS c.gtld-servers.net. com. 22124 IN NS g.gtld-servers.net. com. 22124 IN NS i.gtld-servers.net. com. 22124 IN NS l.gtld-servers.net. com. 22124 IN NS m.gtld-servers.net. com. 22124 IN NS k.gtld-servers.net. com. 22124 IN NS e.gtld-servers.net. com. 22124 IN NS h.gtld-servers.net. com. 22124 IN NS b.gtld-servers.net. com. 22124 IN NS j.gtld-servers.net.
We can choose any root server for next query , I will choose m.gtld-servers.net :
dig NS microsoft.com @m.gtld-servers.net
Result :
;; AUTHORITY SECTION: microsoft.com. 172800 IN NS ns1.msft.net. microsoft.com. 172800 IN NS ns2.msft.net. microsoft.com. 172800 IN NS ns3.msft.net. microsoft.com. 172800 IN NS ns4.msft.net. microsoft.com. 172800 IN NS ns5.msft.net. ;; ADDITIONAL SECTION: ns1.msft.net. 172800 IN A 65.55.37.62 ns2.msft.net. 172800 IN A 64.4.59.173 ns3.msft.net. 172800 IN A 213.199.161.77 ns4.msft.net. 172800 IN A 207.46.75.254 ns5.msft.net. 172800 IN A 65.55.226.140
OK we are done , the ADDITIONAL SECTION in last query contains the glue records :
ns1.msft.net. 172800 IN A 65.55.37.62 ns2.msft.net. 172800 IN A 64.4.59.173 ns3.msft.net. 172800 IN A 213.199.161.77 ns4.msft.net. 172800 IN A 207.46.75.254 ns5.msft.net. 172800 IN A 65.55.226.140
I just noted my caching bind9 dns server is using 306MB of my precious memory ! what the hell is it doing !? go to hell bind !
/etc/init.d/bind9 stop apt-get remove bind9
so I decided to install another caching dns server , after some research I found PowerDNS. it uses MySQL for storing its zones , but hopefully its caching component doesnt need mysql , so great , lets go and install it.
My favourite OS is debian lenny , so I ran the following command :
apt-get install pdns-recursor
WOW , it was very simple ! it is already working on localhost , but I needed it to listen on all IPs on my box and accept queries from everyone 😀 I wanted to serve public :p so I went to /etc/powerdns and opened “recursor.conf” file and made the following changes :
allow-from= local-address=0.0.0.0
and restarted the service by :
/etc/init.d/pdns-recursor restart
it’s done 😀 now it is working as a public caching name server.
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