Hi
Our company will prepare ipv6. I have the following questions
We will apply ipv6 from ARIN and try to use it in hosting business
1/ Can we use it in our current AS which is using ipv4? If not. Do we
have to apply new AS?
2/ Can arin not allow us to apply ipv4 for the future after we apply ipv6?
3/ Any advices to do ipv6 in hosting business
Thank you for your help
We will apply ipv6 from ARIN and try to use it in hosting business
1/ Can we use it in our current AS which is using ipv4? If not. Do we
have to apply new AS?
No, you can route IPv6 & IPv4 from the same ASN.
2/ Can arin not allow us to apply ipv4 for the future after we apply ipv6?
If you need IPv4, apply for it. You might have a *better* chance if you
already have a plan to implement IPv6, than if you have not considered
it.
3/ Any advices to do ipv6 in hosting business
Software. Plesk barely has IPv6 support (>10.2) and I'm yet to hear
about it from CPanel.
Furthermore connection tracking in RHEL/CentOS 5 is totally broken for
IPv6 if you're using it for IPv4 also...
But mostly: you just have to dive in and see what works/what doesn't.
Just don't test it on your live servers!
Tom
1/ Can we use it in our current AS which is using ipv4?
Yes.
2/ Can arin not allow us to apply ipv4 for the future after we apply ipv6?
They're going to do that anyway once they run out, but it's not like "you have v6 so you don't need more v4".
3/ Any advices to do ipv6 in hosting business
Read a good book. 
There's also tons of informatin out there on the web and in meetings.
For hosting you really want to think about how to set up your VLANs. Each customer in their own VLAN is ideal but not always possible, mostly depending on how IPv4 is set up.
http://fengnet.com/book/Definitive%20MPLS%20Network%20Designs/ch01lev1sec6.html
http://www.armware.dk/RFC/rfc/rfc4798.html
http://www.net.t-labs.tu-berlin.de/teaching/ss09/RL_labcourse/docs/05_juniper.pdf
Standards and Technologies:
* RFC 4271 Border Gateway Protocol 4
* RFC 4456 BGP Route Reflection
* RFC 5065 Autonomous System Confederations for BGP
* RFC 1997 BGP Communities Attribute
* RFC 2385 TCP MD5 Authentication for BGPv4
* RFC 5492 Capabilities Advertisement with BGP-4
* RFC 2918 Route Refresh Capability
* RFC 4760 Multiprotocol Extensions for BGP-4
* RFC 2545 Use of BGP-4 Multiprotocol Extensions for IPv6 Inter-Domain Routing
* RFC 4893 BGP Support for Four-octet AS Number Space
http://www.ipv6-es.com/03/documents/cisco/IPv6_over_MPLS.pdf