v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space (IPv6-MW)]
sethm at rollernet.us
Thu Feb 5 01:35:08 UTC 2009
Mark Andrews wrote:
> In message <498A3CA5.6060801 at internode.com.au>, Matthew Moyle-Croft writes:
>> Anthony Roberts wrote:
>>> On Thu, 05 Feb 2009 11:08:44 +1030, Matthew Moyle-Croft
>>> <mmc at internode.com.au> wrote:
>>>> Let's face it - the current v6 assignment rules are to solve a 1990s set
>>>> of problems. A /64 isn't needed now that we have DHCP(v6).
>>> It's needed to prevent people from NATing in v6, as they'll still want
>>> their stuff behind a firewall, and some of them will want subnets.
>> Why do we want to prevent people using NAT? If people choose to use
>> NAT, then I have no issue with that.
>> This anti-NAT zealotism is tiring and misplaced.
> NAT's break lots of things and increase the development
> costs of every piece of network based software being written.
> If we could get a true accounting of the extra cost imposed
> by NAT's I would say it would be in the trillions of dollars.
> NAT's are a necessary evil in IPv4. If every node that
> currently communicates to something the other side of a NAT
> was to have a global address then we would have already run
> out of IPv4 addresses.
> NAT's are not a necessary evil in IPv6. Just stop being
> scared to renumber. Addresses are not forever and when you
> design for that renumbering get easier and easier.
> For everything else there are alternate solutions.
Far too many people see NAT as synonymous with a firewall so they think
if you take away their NAT you're taking away the security of a firewall.
A *lot* of these problems we face are conceptual rather than technological.
More information about the NANOG