[Ndn-interest] About Must Be Fresh

[Lixia Zhang]

> On Jan 10, 2017, at 8:30 AM, Matteo Bertolino <Matteo.Bertolino at eurecom.fr> wrote:
> 
> On the packet specification section of the website (here: http://named-data.net/doc/ndn-tlv/interest.html#mustbefresh), there is written:
> 
> The FreshnessPeriod carried in each Data packet (Data Section) is set by the original producer. It starts counting down when the Data packet arrives at a node. Consequently if a node is N hops away from the original producer, it may not consider the Data stale until N X FreshnessPeriod after the Data is produced.

this is the theoretical upper bound.

> Then, I do not completely agree with the last sentence. I would write [...]  it may not consider the Data stale until N x T after the Data is produced, where T is the average time requested to send the requested Data packet between two nodes on the path producer-consumer.

this is the expected period.

> 
> What do you think about it?
> 
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