Ipv6 and DNS
am Imran working in a software development firm. Your
interview with Chandan Menderitta called 'New Addresses
for your Network' in the May issue was very interesting
and informative. It certainly is a good idea to be prepared
in advance for any IP address crunch that may happen.
I have a few queries. Will you respond to them please?
Suppose I connect to an ISP's DNS where all the devices
have IPV4 addresses. What will happen if I send an IPv6
request, how will the DNS resolve the request?
2. Do you think that IPv6 is the complete IP solution?
After around 30 years don't you think we will need an
3. Who has designed IPv6?
am happy that you find the article interesting and informative.
I had forwarded your queries to Chandan, and he has
got back to me with replies.
1. IPv6 has to be end-to-end. If you send an IPv6 query,
it has to be understood by the end station. Since IPv6
uses its own DNS system, the end station and the DNS
server will need to have v6. Though there are possibilities
of having v6-v4 translation mechanisms, one has to make
sure that the DNS server acting from the v6 side should
have the knowledge of the same. For
more information please refer to RFC# 2874 and 3056.
2. The total number of addresses in v6 is 340, 282,
366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456.
Looking at such a large address space and the history
of IP, one can safely assume that this will be good
enough for the next 30 years.
3. IPv6 is being developed/designed by IETF and they
have various working groups handling different aspects
of v6. You can refer to www.ietf.org/html.charters/ipv6-charter.html
for more on this.
Thanks for writing.
VoIP for every one
'Net calls: There's room for every one' in the May issue
of the Network Magazine was a very informative and well-written
piece. I work at NISIET which is an autonomous body
of the Ministry of SSI, Government of India. It has
a premier training institution and we had conducted
a national level seminar called 'VOIP - Techno-legal
challenges in India' in the second week of June.
We also plan to conduct Post Graduate Diploma courses
on VOIP. I seek your help in locating expert paper presenters,
solution providers, developers and members of faculty.
I will be grateful if you mail me the contact details
of the people who you got in touch when writing the
Dear Mr Prasad,
you for appreciating the article. I hope your seminar
was a grand success. The people I interacted with have
been quoted in the article. You can let me know if you
want to contact any one among them.
www.ispai.com also lists the contact details of all
3.) Net Calls
Your article 'Net Calls: There's room for Everyone'
in the May issue of Network Magazine is very good. I
have a couple of queries.
In India there are many ISPs that
hope to start IP Telephony services.
International companies like
Net2Phone, DialPad.com, Mediaring.com have also started
similar service. But is it legal for a home user to
use an international card to make overseas calls? Can
a user purchase a calling card with a credit card?
Aastha Network Solution
Dear Mr Mankad,
you for appreciating the article.
Answering to your doubts, Net telephony services are
now offered by most ISPs in India. All these service
providers have tied up with companies like Net2Phone,
DialPad.com, and Mediaring.com. Purchasing these cards
is legal and can be availed by both home and corporate
Using a credit card is perfectly fine because it is
only a payment medium.
Broadband at home
I read your article on Broadband in Network Magazine
May 2002. Your forecast about the future Broadband scenario
was interesting. As a domestic consumer I would like
to know if Broadband can be used in the household for
Internet connectivity. Will it be too costly? Will the
cost of Internet connectivity come down if Broadband
connectivity services become popular?
Dear Dr Raju,
In India, the various forms of Broadband Access for
the home are:
1. Cable (TV)
Fiber Optic Broadband
Cable TV operators in your area may offer Internet access
over the cable connection. The advantage of this method
is that you can use the same connection for both regular
TV and Internet access. It is a cost-effective method
and the costs are mainly for the Cable modem and splitter.
DishNet offers DSL broadband connectivity. The advantage
of this method is that it uses the existing phone line.
Like cable, the costs are mainly for equipment at the
customers premises (the hub and DSL modem).
The third form of Internet access, which is yet to catch
up is fiber optic connectivity. Right now this is not
cost-effective for the home user. So you can explore
the first two options. Speak to the service provider
and ask about the various plans offered. You can also
get this information from the service provider's website.