turning off IPv6

[ubuntu at rio.vg]

Derek Broughton wrote:
> John DeCarlo wrote:
> 
>>
>> It should be made clear that IPv4 is deprecated.
> 
> It's only deprecated by the technophiles who know what they're doing. 
> Unfortunately, there are countless ISPs that don't provide IPv6 (mine
> doesn't).

It should be noted that most ISPs don't offer IPv6 because of legacy
equipment.  Virtually all the older routers and even some of the new
ones have no or untrusted IPv6 support.  If your business is providing a
network, IPv6 currently isn't an option for most ISPs at this point in time.

>> In fact, the argument is the same if you said "why support routable IPv4
>> addresses?  no one uses them any more, they all use NAT routers and
>> private addresses"
> 
> My only _routeable_ address is IPv4 both on my network and at my client's.

You _have_ to support routable IP addresses.  How do you think the data
is going to get to your nat gateway?  Additionally, nat is a significant
load.  You'd need an awfully big device to run the nat through, and
that's one hell of a single point of failure.

Business ISPs also have customers that run servers.  Typically, business
ISPs will give their customers a /29, so they can run a nat gateway and
a couple of servers.  Certainly not enough to make all their desktops
routable, unless it's a _very_ small company.

Only legacy networks still run routable IP addresses to the desktop.  I
don't know of any businesses that still do, but I know some universities do.