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Re: New Version Notification for draft-jiang-v6ops-incremental-cgn

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Hi

A document such as this is very helpful and I thank the authors.
One concern I have about this kind of model is the widespread
ICMP filtering in IPv4 networks. I see many ISPs that filter ICMPv6
just as they do with IPv4 and has been causing problmes. This
is especially important in a tunnel based solution such as this.

> As soon as a certain critical amount of networks and network traffic 
> are using IPv6, maintaining IPv4 is extra cost with doubtful benefit.  
> 
> This alone is a reason to abandon IPv4.

IMHO, maintaining a fully dual stacked
network is very expensive. How expensive? would depend
on the size of your network, or what equipment you are using,
or what kind of services you provide, but some day when
IPv6 does spread, the "extra cost" will need to be charged
to customers and that's probably when we may start to see a
motivation by the end users.

As far as my network goes, configurations are 1.5 times
longer, maintenance time is slightly longer, and all automation
and management tools need be developed and maintained to
support both stacks.

Regards,
Seiichi Kawamura
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