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

> 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.

Hi, Seiichi, thanks for your reply. I understand your concern. Yes, ICMP fliter is a problem. We will take this in count later.

> > 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.

Fully agreed. Actually, I am very much concern about this. Many ISPs seem have accepted the concept of dual-stack network with really understanding the complication and costs of it. I guess we need to do something to expose this. Otherwise, the whole industry may be misleaded.

Best regards,

Sheng

> Regards,
> Seiichi Kawamura
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