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

[Alexandre Petrescu <[e-mail]>]

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