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my inquiry consists of two questions as follows:
1- Is it possible to use root DNS servers instead of the authoritative DNS servers of the ISP that I am connected too?
2- If yes, then why my machine can not access these root DNS servers?
to be clear, I am in Malaysia and I am connected to the main ISP and their DNS server IP address are (18.104.22.168 and 22.214.171.124), I changed the DNS IP address of my machine to one of the root DNS server (like the one operated by IANA 126.96.36.199 or by RIP NCC 188.8.131.52), but unfortunately I am not able to get any response when I request any URL.
Take note that I am able to ping these root DNS servers.
Later I changed the DNS IP address settings in my machine to the one of the DNS server of a local company in Malaysia, and I succeeded to get the URLs that I requested.
Does that mean that the DNS requests over port 53 to outside Malaysia have denied and blocked: by the ISP peolpe whoes I am connected to??
1 - no. DNS root servers are consulted by Internet Name servers. these are queried for the domain name that you are trying to acces based from the Internet DNS server that you are using.
2 - what you can do is stick with your ISP's DNS servers OR setup your own DNS service (if you are using a commercial IP - ie. the one from your ISP). u might need to update your named.ca file. search for some DNS howto's for a clearer explanation.
if you feel you won't get blocked by that company who's DNS server you are using, well, maybe u can stick to it.
if you dont' want to setup your own DNS service, use your ISP's DNS server IP addresses - that's the most recommended solution for first time cases like this.
if u feel u want something more, go search in www.google.com/linux for some "DNS howtos" and try setting up your own DNS server. if it still fails, go back to your ISP's DNS server setup and search for more howto's that will help u in setting up your own DNS server.
I think my inquiry has mixed with Rak's one
Any way born4linux, do you mean that normal clients can not cnosult the root DNS servers directly? Do you mean that the only Local, Authoritative or other Root DNS servers can only consult the root DNS servers???
sorry Bassam, i just noticed there were two of you here. No. clients shouldn't use the root servers directly (though they can) but that would be useless and a waste of time/bandwidth. each name server consults another higher level name server for it to locate a domain that you are trying to access. it works out like some kind of hierarchial structure. better check out the DNS admin howto for a better explanation. i'm not good at explaining things.