"Roland Perry" wrote in message
news:tYpxTU3BVMOKFA3f@perry.co.uk...
> In message
> <47a2d567-3e6f-4ac0-ac31-ad2bd4667de6@y7g2000yqa.googlegroups.com>, at
> 03:07:01 on Wed, 17 Jun 2009, Boltar remarked:
>>On Jun 17, 10:14 am, "Mortimer" wrote:
>>> Oh, doesn't it work in the same way as IPv4, in that all PCs on a
>>> network
>>> send packets that just quote the router's public IP address. Does the
>>> concept of NAT not work in the same way for IPv6?
>>
>>IP6 doesn't need NAT. NAT is only used because of the shortage of IP4
>>addresses. And yes , all PCs do send packets with a public IP
>>address , but the point is with IP4 that address changes
>
> Only if the ISP has failed to give the user a static (or fixed -
> dynamically assigning the same each time) IP address.
>
>>and its impossible to identify which actual machine they came from - the
>>best you could do with home broadband would be the house itself.
>
> Only restricted in that case because of NAT.
>
>> With IP6 you can identify the actual machine - and that goes for when
>> you're supposedly using "anonymous" public wifi.
>
> What makes you think your ipv6 address is portable between ISPs like that?
The same dynamic versus static argument could apply to a PC's IP6 address in
the same way that it currently applies to the public address of a NAT router
for IP4.
In other words, either the ISP assigns a static or fixed address or else it
assigns a dynamic address each time the PC connects, in the same way that it
either assigns a static/fixed or else dynamic address to the router's public
address each time the router connects.
The PC needs to be allocated an IP address via the ISP, rather than being
set to a static address, if it is to be able to roam between networks.
How does subnetting work in IP6? With a NAT router, all the PCs on the
private side are allocated different addresses inthe same subnet and so they
can ping and communicate with each other. If IP6 doesn't use NAT, what
guarantee will there be that several PCs on the same LAN connected to the
internet via a (non-NAT) router will be able to communicate? Or is the
subnet set to 0.0.0.0 (or the IP6 equivalent) so that all IP addresses are
able to communicate?
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