Re: [netlmm] Review of LMA Discovery document

Hi Christian,

Thank you for the review.

On Apr 30, 2010, at 12:53 AM, Christian Vogt wrote:

> Folks,
> 
> Jouni asked me to review the LMA Discovery document.  I did this, and
> found that the document is mature and well written, and should be
> progressed further as soon as possible.  I have just one comment on
> section 4:
> 
> Section 4 gives two classes of reasons not to use the DNS for LMA
> discovery.  The first class is related to update propagation latencies
> caused by caching.  The second class is related to update latencies
> caused by primary-to-secondary server synchronization.  My comment
> relates to the first class of reasons:
> 
> Can't the issues described be well avoided?  In deployments where the
> DNS is to be used for LMA discovery, make sure you have DNS
> implementations that accept low TTLs, and set your TTLs low -- that
> seems to be it.  I agree that the issues you are describing do need to
> be considered, and hence it is very important to document them.  But I
> personally don't see them as show-stoppers.

Agree that they are not show-stoppers. Maybe the document could emphasize more clearly that the DNS administrator just has to know what he's doing. Enhancing the first paragraph slightly.

   A number of LMA discovery solutions described in Section 2 and
   Section 3 eventually depend on the DNS.  This section discusses
   impacts of the DNS response caching and issues related to the Dynamic
   DNS [RFC2136] updates. The impacts and related issues can mostly be
   avoided by a proper DNS administration that takes PMIPv6 domain
   deployment aspects into consideration.

> 
> This said, your second class of reasons may be more intractable.
> 
> Hope this helps.  Best regards,

- JOuni

> 
> - Christian
> 
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