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Re: ULAs [Re: draft-ietf-v6ops-ipv6-cpe-router-03.txt WGLC]
I'm fine with your suggested text.
On 2010-01-06 09:16, Dan Wing wrote:
>> -----Original Message-----
>> From: Brian E Carpenter [mailto:firstname.lastname@example.org]
>> Sent: Tuesday, January 05, 2010 11:48 AM
>> To: Dan Wing
>> Cc: 'Fred Baker'; email@example.com; firstname.lastname@example.org;
>> email@example.com; firstname.lastname@example.org
>> Subject: ULAs [Re: draft-ietf-v6ops-ipv6-cpe-router-03.txt WGLC]
>> On 2010-01-06 08:00, Dan Wing wrote:
>>> Section 3.1 should additionally mention that an end-network
>>> IPv4 CPE that incorporates a NAT also incorporates a DHCPv4
>>> server. The inclusion of a DHCP server in the CPE is implied,
>>> but should be explicitly stated. The DHCP server in the CPE
>>> allows the in-home network to be self-sufficient (for IP
>>> addressing, if not naming).
>> Sure, for IPv4, you need DHCP, but...
>>> This is relevant to IPv6 because, I have been told, ULAs
>>> provide a similar "LAN only" address. This should be
>>> mentioned or a pointer to how hosts inside the home should
>>> use ULAs mentioned. We do not want streaming between an
>>> in-home NAS and an in-home television to rely on the
>>> WAN link's availability. This is mentioned (insufficiently)
>>> in Section 4.2 and some of the L-* requirements.
>> I don't understand what you're getting at here. Whether the
>> LAN uses a ULA prefix is orthogonal to whether it uses
> Agreed; but I didn't say DHCPv6 was needed to assign ULAs (you did).
>> It can be set up by RAs and SLAAC (or even manually,
>> but that's unlikely).
>> I think the L-* requirements for ULAs are necessary and sufficient.
> I agree the L-* requirements for ULAs are sufficient.
> I am asking for more explanatory text about the value and purpose
> of ULAs (or a pointer to such explanatory text), in Section 3.2
> "IPv6 end-user network architecture", because Section 3.2's only
> mention of ULA is that the CE Router is a "ULA boundary".
> We're in WGLC, so my suggested text for Section 3.2 is along
> the lines of something like this:
> Unique Local IPv6 Unicast Addresses (ULA) [RFC4193] are used
> by hosts communicating within the End-user Network; this is
> functionally similar to RFC1918 addresses used within an
> IPv4 End-user Network.
> and place that sentence immediately prior to the sentence in Section
> 3.2 starting with "The IPv6 CE router defaults to acting as
> the demarcation point ...".
>> Despite the problems with RFC3484, I think the provision of a ULA
>> prefix by the CPE will bring about local streaming automatically.
>> That was certainly the intention behind ULAs.
> I'm asking for text to provide motivation for the existing L-1
> requirement (which reads "The IPv6 CE router MUST support ULA
> addressing [RFC4193]").