India Broadband Forum

rajan17_88

BSNL completely sucks and i would like to know weather i can use airtel dns server instead of bsnl or open dns?

hexwiz

You sure can use any working DNS server for your connection as long as that DNS server does not drop/deny your request. But I'd suggest you check the latency first. Ideally your own ISP's DNS response should be faster since you are basically within the same segment and even when you are not, definitely closer than one on a totally different network. If you are using XP you can configure multiple DNS servers for your connection. So you could have a long list of DNS servers including BSNL, Airtel and even OpenDNS servers. You can change the order/priority of the servers and see which of them works for you best

rajan17_88

From yesterday the connection is too slow and open dns is not working. Whem i ping open dns i get request timed out. Any one facing the same problem? What is the airtel dns sever ips?

Gary4gar

airtel DNS Server

203.145.184.13
202.56.250.5
-----------------------------
Simply change your dns and try pinging a site like google.com
Choose the one which has least latency

just4kix

DNS does not play much part apart from IP address resolution. It will help in speeding up speed only to a small extent. The quicker the IP address is resolved, the faster your page will load.

But all this also depends upong server ping time. Consider this example:

a) Suppose you wish to login to indiabraodband.net (this forum). Then you will type this URL in your browser address bar.
b) The DNS will resolve www.indiabroadband.net to 69.162.110.114.
c) Suppose you are using default BSNL provided DNS and it takes 100 ms to resolve this.
d) If you are using OpenDNS, it may be quicker and suppose OpenDNS takes only 30 ms to resolve the name.
e) So, effectively, you have saved 70 ms, and page will load 70ms quicker by using openDNS.

But ...

a) If BSNL DNS server ping time is 200 ms whereas openDNS server ping time is 300 ms.
b) Then BNSL DNS will save you 100 ms in ping time. Substract 70 ms from this and BSNL DNS still works 30 ms faster.
c) It all depends upon your location. Check the DNS ping times. Switch the DNS and check destination IP ping times.

In my case, I found that BSNL DNS works faster.

__________________

rajan17_88

I tried airtel dns but its not working. I am from chennai do anyone else facing the same problem. I am able to downlosd but not able to browse any site.
When i use open dns, i am getting page load error. Even with airtel i get the same.
What may be the problem?

I tried airtel dns but its not working. I am from chennai do anyone else facing the same problem. I am able to downlosd but not able to browse any site.
When i use open dns, i am getting page load error. Even with airtel i get the same.
What may be the problem?

gsin

I have a question. When I request an URL in my browser, my machine sends out a DNS querry to the nameserver. Is this request sent direct to the nameserver or is it routed through the default gateway configured on my end. If it is sent directly then how does it find the route to that nameserver, since the routing features are configured on the gateway and not on my machine? If it is the latter, then how does it matter what DNS settings I have on my end? Since my request is going through a gateway, the DNS settings on the gateway should take effect. Also if this is the case then how is it possible to have DNS settings of a nameserver outside my network, since the gateway can restrict you to use only your ISP's nameservers

Thanks

hitler517

When the bsnl dns server is up and running, itz the one offering the best speeds..
No doubt about that...
But due to congestion on holidays and so on, they do go down..
better stick to bsnl dns and when it breaks down, shift to open dns or airtel dns or whatever...

just4kix

All network requests (local/intranet or internet) always go thru the respective gateway. Nothing goes to internet directly. Gateway IP is also the router of that circuit that does the NAT.

gsin

Agreed.
Presuming normal home based broadband settings with a modem.
1. My pc ip 192.168.1.2 gets translated to 139.158.14.1 (example). Am I right is saying that this NAT is done by the modem/router at my end?
2. Taking the case of a dns querry, when this request hits the gateway(the router of the circuit) which then routes it to the nameserver, does the nameserver address come pre-specified as the one set at my modem/router? If not, then can the gateway specify the nameserver address?

Also if my assumption no. 1 is true, then does that mean that after i cross the modem at my end, I have a public ip and can i point to a gateway over the internet instead of the default gateway?

Thanks

@just4kix

any ideas?

just4kix

Consider this scenario.

1. You are having a modem and a PC connected to internet.
2. Your modem's internal IP address is 192.168.1.1 and your PC has the IP address as 192.168.1.10.
3. Your ISP has given assigned the IP address to your modem as 117.196.96.108.
4. Your ISP's default gateway is 117.196.96.1.
5. You have set the DNS in your modem as
   Primary: 208.67.222.222
   Secondary: 208.67.220.220
6. You are trying to reach IBF at 69.162.110.114.

This is what will happen:

• Your net (http) request originating from 192.168.1.10 will be sent as a request originating from 117.196.96.108.
• This is NAT and is done by your router.
• BSNL gateway server (117.196.96.1) will receive this request. There is a router on the BSNL network also.
• It will convert the request originating from 117.196.96.108 as a request originating from 117.196.81.22 (as an example). This is NAT done by BSNL router.
• It will then try to locate the Primary DNS, 208.67.222.222.
• Once located, the primary DNS will resolve the http URL to 69.162.110.114.
• Then thru a series of hops from one gateway to another, you will reach the destination.

Hope this is clear. Try the command:

gsin

Thanks, that explains everything.
One question:
The bsnl router will locate this DNS because it was configured on my modem/router.
Can the bsnl router have a different Primary DNS configured? and can it enforce that configuration on the http request made by me?

Thanks

just4kix

BSNL will not enforce policies.

Your DNS settings are taken from your router. If you have left them as "Use Default", then BSNL will use the BSNL DNS.

gsin

Understood. Thanks

ajji23

i hv bsnl500c plan....and os: window7 ultimate......
now when i click on connect button to connect internet...mu pc is forcelly turned off.....then again at startup.....msg...is there...
ur pc is recovered from an unexcepted shut down
event name: Blue screeen
DNS SERVER ERROR


SO I M UNABLE TO CONNECT TO INTERNET....WHAT SHOULD I DO...PLZ REPLY FAST!

//Moderator note: You have not activated your account. Please click on the link in the mail you received from the forum admin in your mailbox. Failure to do so will cause all your posts go into moderation. - just4kix

essbebe

@ajit123
INFO required:
1.mention your modem/router model

ACTION:
2. Without trying to connect to Internet

START Network LAN properties
TCP/IP
properties
check obtain Ip address automatically
obrtain DNS automatically.
APPLY SAVE

REPORT

START run
type cmd type ipconfig /all

Post screen shot or copy/Paste the page.

Para two:
OR
try in SAFE MODE with internet connection.
( Key F7 or F8 when you start computer )

eruptionjoojo

@ajji23

How come you be using window7 ultimate as it is yet to be offically released ...........
though it's beta version is out .................

superprash2003

mostly a virus/spyware.. check with an antivirus and antispyware..