Re: IPv6 certification - IPv6 Router Advertisement Lifetime 0 and Reachable time 10 seconds

Alexandre Petrescu <alexandre.petrescu@gmail.com> Mon, 25 January 2021 15:40 UTC

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Subject: Re: IPv6 certification - IPv6 Router Advertisement Lifetime 0 and Reachable time 10 seconds
To: Nick Hilliard <nick@foobar.org>
Cc: ipv6@ietf.org
References: <CAGeZV=Q=awxFd=vsfBiBC2vt7o3Wkm9ECMSi+UU90ATKmHY32Q@mail.gmail.com> <BAB67E82-9BE8-4E7A-8548-5475E93FD137@employees.org> <CAGeZV=T4B5m7RYrKL4a4peQjZAoJiUqNv7V=0iaz5VdWeSTKng@mail.gmail.com> <08841dc2-9a4e-dacb-174a-a8f4cdfca1c7@gmail.com> <b0b05fa4-532f-98cd-ac41-28cc716a23df@foobar.org> <9ea964a1-4722-c8b4-5c95-e0883b162bf1@gmail.com> <482bac5f-6f8f-5a93-ac2a-e537bd5a2c93@foobar.org>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Mon, 25 Jan 2021 16:39:57 +0100
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Le 25/01/2021 à 16:09, Nick Hilliard a écrit :
> Alexandre Petrescu wrote on 25/01/2021 14:44:
>> YEs, it means to not install rhis router now as a default router, but 
>> maybe do it later.
> 
> it means:
> 
>>     A Lifetime of 0 indicates that the router is not a
>>     default router and SHOULD NOT appear on the default
>>     router list. >
> + other stuff like:
> 
>>    Note that system management may disable a router's IP forwarding
>>    capability (i.e., changing the system from being a router to being a
>>    host), a step that does not necessarily imply that the router's
>>    interfaces stop being advertising interfaces.  In such cases,
>>    subsequent Router Advertisements MUST set the Router Lifetime field
>>    to zero.
> 
> Can you point the bit where RA Lifetime = 0 means "maybe do it later"?

In RFC 4861 it is there:> "AdvDefaultLifetime
>                      The value to be placed in the Router Lifetime field
>                      of Router Advertisements sent from the interface,
>                      in seconds.These limits may be overridden
>                      by specific documents that describe how IPv6
>                      operates over different link layers."

In RFC 6275 "Mobile IPv6" it is something about multiple Home Agents
(routers), using Router Lifetime fields in Router Advertisements, that
might dynamically take a main role there:

>       In addition, the sending home agent MAY
>       dynamically set the Home Agent Preference value, for example,
>       basing it on the number of mobile nodes it is currently serving or
>       on its remaining resources for serving additional mobile nodes;
>       such dynamic settings are beyond the scope of this document.

In RFC 5798 "VRRP" there is something about Master and Backup VRRP 
routers there:
> 8.2.3.  Router Advertisements
> 
>    When a Backup VRRP router has become Master for a virtual router, it
>    is responsible for sending Router Advertisements for the virtual
>    router as specified in Section 6.4.3.  The Backup routers must be
>    configured to send the same Router Advertisement options as the
>    address owner.
Alex

> 
> Nick