Ian,
> Thanks for that. So we actually aren't too far apart. There needs to be a DMR
> (or equivalent) that has the IPv6 address of the BR.
>
> But, this is one thing that's been confusing me since the publication of (I
> think v03), where the DMR is no longer described, or mentioned anywhere in
> the MAP base draft. However it does still exist in the MAP DHCP option draft.
> But neither of the drafts actually describes what it is and how to use it.
> The current map 05 draft only discusses the use of an IPv4 route, which I
> think is misleading – the IPv6 address of the BR is also needed (as Ole's
> pointed out in his mail).
>
> A DMR, or something functionally equivalent is necessary, but this is not
> just an IPv4 route. It has to have the v6 address of the BR, used to build a
> tunnel. The v4 route points then to that tunnel.
>
> So, the reason that I said it's incompatible is that the current text in the
> MAP base draft doesn't describe any way of getting the v6 address of the BR
> other than those that can be provided with a BMR and FMRs. I.e. An IPv4
> default route with an IPv4 next hop which is in a map domain which the CPE
> has an FMR for. lw4o6, which doesn't use mapping rules cannot calculate the
> v6 address of the concentrator from a v4 next hop address.
>
> I realise that this is not how it is meant to work (and you've confirmed
> that), but this is the only way that you could make it work given the text
> that is actually in the draft and that's what I think needs to be changed.
> This would bring the MAP/lw4o6 & unified CPE drafts back in line…
>
> … then we can have the discussion about what the best DHCP mechanism to
> provision the client with the v6 address of the concentrator is :-)
please propose text.
the MAP base document does not specify the provisioning mechanism itself.
but it does specify which parameters need to be provisioned.
section 7 states:
For a given MAP domain, the BR and CE MUST be configured with the
following MAP elements. The configured values for these elements are
identical for all CEs and BRs within a given MAP domain.
o The Basic Mapping Rule and optionally the Forwarding Mapping
Rules, including the Rule IPv6 prefix, Rule IPv4 prefix, and
Length of EA bits
o The IPv6 address of the MAP BR.
o Hub and spoke mode or Mesh mode. (If all traffic should be sent
to the BR, or if direct CE to CE traffic should be supported).
section 5.4 states:
To reach IPv4 destinations outside of the MAP domain, traffic is sent
to the configured address of the MAP BR. On the CE, the default can
be represented as a point to point IPv4 over IPv6 tunnel [RFC2473] to..
would it help you if section 5.4 states the "configured IPv6 address of the MAP
BR"?
cheers,
Ole
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