Re: IPv6 certification - IPv6 Router Advertisement Lifetime 0 and Reachable time 10 seconds
Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 26 January 2021 15:31 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> <c95b5952-3299-2700-2643-43c4e71620fe@gmail.com> <9b0e6247-37e3-69d7-b461-588e8f5463f2@foobar.org>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Tue, 26 Jan 2021 16:30:47 +0100
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Nick, Le 25/01/2021 à 20:30, Nick Hilliard a écrit : > Alex, > > I've read the link you cited, but maybe am missing something here. Can > you be clearer about situations where Router Lifetime = 0 means > something other than "do not install this router address in the routing > table"? I agree with you - no I can not be clearer. When router lifetime == 0 it means that it must not be a default router. It could be used for other things, but certainly it's not a default router. These other things vary. > The limits you note in rfc 4861 seem to refer to this value not being > equal to zero. > > 6275 only mentions AdvDefaultLifetime to say that it should be at least > one second. > > The VRRP situation requires that the backup routers use the same RA > options, which would presumably not be zero, because then no routers > would be active. YEs. Alex > > Nick > > Alexandre Petrescu wrote on 25/01/2021 15:39: >> >> >> 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
- IPv6 certification - IPv6 Router Advertisement Li… Isaac
- Re: IPv6 certification - IPv6 Router Advertisemen… Nick Hilliard
- Re: IPv6 certification - IPv6 Router Advertisemen… Alexandre Petrescu
- Re: IPv6 certification - IPv6 Router Advertisemen… Isaac
- Re: IPv6 certification - IPv6 Router Advertisemen… Ole Troan
- Re: IPv6 certification - IPv6 Router Advertisemen… Nick Hilliard
- Re: IPv6 certification - IPv6 Router Advertisemen… Isaac
- Re: IPv6 certification - IPv6 Router Advertisemen… Ole Troan
- Re: IPv6 certification - IPv6 Router Advertisemen… Timothy Winters
- Re: IPv6 certification - IPv6 Router Advertisemen… Isaac
- Re: IPv6 certification - IPv6 Router Advertisemen… Ole Troan
- Re: IPv6 certification - IPv6 Router Advertisemen… Isaac
- RE: [EXTERNAL] Re: IPv6 certification - IPv6 Rout… Manfredi (US), Albert E
- Re: [EXTERNAL] Re: IPv6 certification - IPv6 Rout… Isaac
- Re: [EXTERNAL] Re: IPv6 certification - IPv6 Rout… Mark Smith
- Re: IPv6 certification - IPv6 Router Advertisemen… Alexandre Petrescu
- Re: IPv6 certification - IPv6 Router Advertisemen… Nick Hilliard
- Re: IPv6 certification - IPv6 Router Advertisemen… Alexandre Petrescu
- Re: IPv6 certification - IPv6 Router Advertisemen… Nick Hilliard
- Re: IPv6 certification - IPv6 Router Advertisemen… Alexandre Petrescu
- Re: [EXTERNAL] IPv6 certification - IPv6 Router A… Bob Hinden
- Re: IPv6 certification - IPv6 Router Advertisemen… Nick Hilliard
- Re: IPv6 certification - IPv6 Router Advertisemen… Ted Lemon
- Re: IPv6 certification - IPv6 Router Advertisemen… Mark Smith
- Re: IPv6 certification - IPv6 Router Advertisemen… Ted Lemon
- Re: IPv6 certification - IPv6 Router Advertisemen… Alexandre Petrescu