A key infrastructure of internet DNS (Domain name System) resolution service is available with must less resolution time from Google. Though traditionally it has been the infrastructure of Internet Service Provider (One who gives internet to you), It makes lot of sense to use resolution service from search engine giant like Google. A report says the average Internet user ends up performing hundreds of DNS lookups each day, and some complex pages require multiple DNS lookups before they start loading. This can slow down the browsing experience, We the internet users prefer faster or nothing. Google crawls lakhs and lakhs of websites every day, they invested huge money and infrastructure man power to maintain large lookup system. Google Public DNS is a recursive DNS resolver, similar to other publicly available services. Now they leverage this to internet users as free service as part of their Speer project, which works on improving internet speed.

Google Public DNS Helps in 3 important aspects of DNS,

SPEED: Resolver-side cache misses,Clever caching techniques, prefetching: before the TTL on a record expires. Google does this asychronously and independently of user requests for a large number of popular domains. This allows Google Public DNS to serve many DNS requests in the round trip time it takes a packet to travel to our servers and back.

It will work well for users with short reach like US, Europe, i doubt about asia. A simple latency to DNS server will touch an average 250 ms. Which will have significant impact on Resolution. Unless they do it as anycast system with multiple distributed servers, bounded to region,with different IP, 2 DNS as listed in the code.google.com will not help.

Security: DNS is vulnerable to spoofing attacks that can poison the cache of a nameserver and can route all its users to a malicious website. Google Public DNS makes it more difficult for attackers to spoof valid responses by randomizing the case of query names and including additional data in its DNS messages.

Validity: Google Public DNS complies with the DNS standards and gives the user the exact response his or her computer expects without performing any blocking, filtering, or redirection that may hamper a user’s browsing experience.

Google Public DNS IP addresses

The Google Public DNS IP addresses are as follows:

• 8.8.8.8
• 8.8.4.4

Google has been doing many works to implement internet speed. Public DNS service is one of them. Coming out of your ISP for DNS makes lot of sense, because most of them are not so keen to maintain them properly. It will also affect ISP revenue, Many of them have been making money by redirecting non-existing domain to advertisement websites with Google DNS they no longer have any control. It would be nice if Google comes out with region specific DNS solution model.

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My Friend Rakes Called me and said

“My web page hosted in my new hosting provider is not loading fast like my previous provider. It is slow and sluggish to load. They are cheating me. I am gonna withdraw my hosting service from them”

This is my lesson to him.

In Worl Wide Wep (WWW) i.e Internet, Very critical parametr is Speed. Like a 350 kmph F1 Cars, Higher the speed you get through your ISP more you go crazy, More is the wastage. Can i call it as a “E-Wastage” in real it is a Resource wastage. Mostly internet service providers use a term called concurrency, even though you subscribed for 5 Mbps,It is not dedicated across a globe to every hop. Because they understand the Technology and limitations behind Internet speed.

A Network connection is controlled by TCP (Transmit Control Protocol), Data transfer to the same is limited to TCP window size of 64kBytes. Time taken to reach your hosting provider, and back (latency) limits no of windows that can be tranfered in a second, and hence your throughput.

For example: A latency of 200 Milli second to your hosting server will limit your single session throughput or bandwidth to 2560 kbps. Since the across the globe internet connectivity is through submarine cables latency of this magnitude is normal between continents. Even though your speed availability is 5 mbps, you can not establish 5 mbps connection to every host. Bandwidths are shared, physical mediums are share. After all we share this sphere called Globe, Why not Internet.

Internet Speed available to you from Points across the globe can be measured by running a speed test. It will create virtual TCP sessions and report you the reading. so many websites offer this service, one such web site is http://speedtest.net/

Latency or time taken to reach your domain or Hosting provider can be identified by doing a simple ping from your PC/Server/Device. command “ping yourdomain.com” in linux “ping yourdomain.com -c 3”

Certainly internet speed isn’t a Rocket Science. Happy Surfing!

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