Re: [lisp] draft-ermagan-lisp-nat-traversal question

Hi Albert,

³Map Register TTL² in the referenced paragraph is indeed the TTL for which
a Map Register stays valid in a Map Server. Suggested time in the RFC for
periodic Map Registers is 1 minute. And MS will expire the registration
after 3 minutes if it does not receive a renewal. So this TTL in RTR
should be set no larger than 3 minutes, and no smaller than 1 minute.
Unfortunately NAPT devices don¹t have a standard TTL for expiring their
address associations; some use 2 minutes as the threshold. So the 3 minute
recommendation for expiring a Map Register seems suitable here.

Hope this clarifies it.

Best,
Vina

On 11/6/17, 1:01 AM, "lisp on behalf of Albert López"
<lisp-bounces@ietf.org on behalf of alopez@ac.upc.edu> wrote:

>In that case, I think that It would be better if the validation time /
>expiration time of the locator associated with the ECM-ed Map Register &
>ECM-ed Map Notify is related with the periodic time of sending ECM-ed
>Map Registers.
>Usually a hole in the nat box is less than two minutes so we send
>periodic ECM Mag register to maintain this hole opened apart from
>maintaining the status in the Map Server. If we use the TTL of the
>record to maintain an entry in the Map Cacahe of the RTR, it is possible
>we maintain an entry which is no longer valid or send packets to an
>invalid rloc.  What do you think?
>
>Regards
>
>Albert
>
>El 03/11/17 a les 18:38, Dino Farinacci ha escrit:
>> The TTL in the Map-Register is the TTL returned in Map-Replies. So it
>>is the expiry time for a map-cache entry. Note it is the ³Record TTL² in
>>the EID-record which both appear in Map-Register and Map-Reply messages.
>>
>> Dino
>>
>>> On Nov 3, 2017, at 1:35 AM, Albert López <alopez@ac.upc.edu> wrote:
>>>
>>> Dear all,
>>>
>>> In section 5.3 of the draft  draft-ermagan-lisp-nat-traversal which
>>>describe the RTR processing, it says that when the RTR receive and
>>>ECM-ed Map Notify, once it is validated, it changes the state of the
>>>associated map-cache entry to verified for the duration of the Map
>>>Register TTL.  What does it mean by Map Register TTL?  it means the TTL
>>>of the record of the Map Register or it is the same concept of the Map
>>>Register TTL of the Map Server which is 3 minutes? If I understand
>>>correctly, if we don't receive more Encap Map Register / Map Notify to
>>>renew this verified period, the map-cache entry of the RTR expires, at
>>>least the locator of the map-cache entry associated with the Encap Map
>>>register.
>>>
>>>    "Once the authenticity of the message is verified,
>>>    RTR can confirm that the Map-Register message for the ETR with the
>>>    matching xTR-ID was accepted by the Map-Server.  At this point the
>>>    RTR can change the state of the associated map-cache entry to
>>>    verified for the duration of the Map-Register TTL"
>>>
>>> Thank you in advance.
>>>
>>> Albert López
>>>
>>>
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>
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