IPv6 Multihoming???

[901563ravi]

Hi,
Few concepts that I want to clarify on IPv6 multi homing-

Scenario- I am an enterprise network and depend on ISPs for my internet
I currently own a class B IPv4 address space from APNIC.
I currently multi home with 2 ISPs for IPv4 www

|WWW|
| ISP1 | |ISP2|

| |
| |

|Company ABC|

Problem Statement- What will be my new world with IPv6.

Option 1

PA from the ISP
==============

If I am assigned PA address space from both the ISPs , will that mean I will have 2 IPv6 addresses for all hosts.How would DNS work for the web servers that I will want to advertise? How to address- session persistency if the primary service provider is offline thinking that I am e-commerce shop?

Option 2

PI from APNIC
============

Should I ask APNIC to assign a PI address space?

If APNIC assigns /48 PI ; as I am implementing multihoning - How will multihoming work if every one wants to implement the same?

1. Address Hierarchy model
   
2. Hardware constraint
   
3. Software constraint
   
4. Some ISPs only accept /32 (ingress filtering)
   

Option 3

NPTv6

Is NPTv6 currently supported on Cisco IOS and is it the way forward to implement Multihoming? (using ULA or PI for networks south of the internet edge)

Option 4

Is LISP being used for multihoming?

Can some one please point to configuration example or implementation guidelines when your edge is dual stacked?

Option 5

Is Shim6 practical to implement condsidering end host OS support etc?

Thanks
Ramu

[Phillip Remaker]

Have you already read:

http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_14-2/142_multihoming.html

[901563ravi]

Hi Phillip,

               I have read the document.

But still from an Enterprise point how would IPv6 multihoming articulate to the way as to how it is currently implemented with IPv4.

Options to go forward and what would be the current BCP on IPv6 Multihoming?

Thanks for you time.

Ramu

[Phillip Remaker · Accepted solution]

It's still being hammered out in the IETF.  Being able to announce a PI address is the best way to go, but very hard since most providers will only accept announcements for short prefixes.

For smaller enterprises, NPTv6 seems the best bet for multihoming.

You might want to look at

http://tools.ietf.org/html/draft-bonica-v6-multihome-02

You might even address your issues to the authors :-)

[901563ravi]

Thanks Phil

Ramu