Paul Brooks pbrooks-ausnog at layer10.com.au
Sat Oct 9 09:21:54 EST 2010

  On 8/10/2010 9:54 PM, pritam.ghosh at wipro.com wrote:
> Dear Roland,
> Thanks for the reply. No, I don't have any V4 space.
> Also, If I publish a Web-portal to an IPv6 address through DNS AAAA
> record, will I be able to access the portal from Ipv4 only machines .i.e
> without enabling dual-stack in the end-user system?

Pritam - there are some commercial gateway products that claim to translate between 
IPv4 and IPv6 networks, acting as a form of proxy.
You could try putting one of these (or maybe you'll need more if your IPv6 network is 
large) at the edge of your network, with your IPv6 network on the inside, and the IPv6 
+ IPv4 Internet on the outside.
Depending on how you have built your BGP link, you may need to locate this gateway 
within your provider's datacentre, at the Airtel end of the BGP link, since you have 
no IPv4 routing information passing across the BGP link . I expect you will need an 
IPv4 address from your provider's space to allocate to the interface facing your provider.

This may solve the ability for your user machines accessing IPv4 locations as well as 
IPv6 locations.

To make your IPv6-only web-portal accessable from the rest of the IPv4 world, you will 
need to advertise it in DNS with IPv4 A records. You may be able to get away with a 
single IPv4 address, which your provider may be able to allocate to you.
If you can't get even one real IPv4 address, then perhaps you can host your website on 
a commercial hosting platform outside your network, or rent a dedicated server in an 
outsourced datacentre offering, which will have real IPv4 addresses that can be 
published in DNS, and real IPv4 connectivity.

Here are links to a couple of products that claim to be able to do the translation - I 
haven't used them, don't know if they will work for you, I expect you are facing a lot 
of testing and trialling.


To access IPv4 websites, you could try the DNS suffix trick described at SixXS 
<http://www.sixxs.net/tools/gateway/> adding '.sixxs.org' to every website address. 
This won't help you with inbound IPv4 traffic though.

Hope this helps a little.


Paul Brooks               |         Mob +61 414 366 605
Layer 10 Advisory         |         Ph  +61 2 9402 7355
Layer 10 - telecommunications strategy&  network design

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