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Hi Adam, 

> And recent computer or distributions is sitting their quietly waiting
> for it's IPv6 address to arrive - probably automatically, via auto
> discovery.  Clients are trivial.

... and that is EXACTLY the biggest problem with IPv6. 

'Introducing' IPv6 happens automatically in most cases, and inadvertently as 
well. The moment ISPs will start supporting IPv6 for their customers will be a 
security nightmare, because IPv6 firewalls will not be configured on most 
networks, and the pseudo-security of NAT will no longer be in effect. 

In fact, a very large number of networks (especially those currently relying on 
NAT 'security') will be completely exposed to the Internet without any 
protection, and the bad thing is that you just don't have to do anything to 
make it 'work'. From one day to the other, IPv6 connectivity will be there and 
most people won't even notice until it's too late. 

One may only hope that home router manufacturers will deliver standard 
configurations with all incoming IPv6 traffic (except answers to outgoing 
packets, obviously) blocked by default, but I'm not very optimistic :-(

So, before you do anything else, set up proper incoming and outgoing IPv6 port 
filtering rules on your perimeter routers. It will save you a hell of a 
headache. 

  Peter.
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