[AusNOG] FW: [Ap-ipv6tf] official shutdown date for IPv4. The date he is pushing for is April 4, 2024. "IPv4 can't go on forever, " Latour said. "
Mark ZZZ Smith
markzzzsmith at yahoo.com.au
Fri Nov 7 14:44:15 EST 2014
----- Original Message -----
> From: Mark ZZZ Smith <markzzzsmith at yahoo.com.au>
> To: "Beeson, Ayden" <ABeeson at csu.edu.au>; 'Paul Gear' <ausnog at libertysys.com.au>; "'ausnog at lists.ausnog.net'" <ausnog at lists.ausnog.net>
> Cc:
> Sent: Friday, 7 November 2014, 13:11
> Subject: Re: [AusNOG] FW: [Ap-ipv6tf] official shutdown date for IPv4. The date he is pushing for is April 4, 2024. "IPv4 can't go on forever, " Latour said. "
>
> Violates specs and isn't scalable, likely to overload control plane.
>
>
To elaborate further,
- Neighbor Unreachability Discovery (NUD) will detect the failure of a default router much quicker than RA expiry, as a default router is also a neighbor, and the NUD timers are much smaller than the RA defaults. Further more, NUD only probes for continuing neighbor existence when there is no other indication that the neighbor still exists. For example, a 'continuing' TCP connection to or through the neighbor (to when the neighbor is another host, or through when the neighbor is a router) is evidence that the neighbor still exists, so NUD doesn't need to probe for unreachability. (And this is a good example of why you shouldn't play with default parameters when you don't know how everything works - you may not actually solve your problem, and you may create other hidden ones that burn you badly when something else goes wrong.)
- VRRP and similar are much better than playing with NUD or RA timers because the operation of VRRP only involves the default routers on the link, and is therefore transparent to the hosts. The load on the routers' control plane is therefore only proportional to the number of routers running VRRP on the link, rather than proportional to the number of hosts, and there will usually be a small and fixed number of routers.
>
>
> ----- Original Message -----
>> From: "Beeson, Ayden" <ABeeson at csu.edu.au>
>> To: 'Paul Gear' <ausnog at libertysys.com.au>;
> "'ausnog at lists.ausnog.net'" <ausnog at lists.ausnog.net>
>> Cc:
>> Sent: Thursday, 6 November 2014, 16:22
>> Subject: Re: [AusNOG] FW: [Ap-ipv6tf] official shutdown date for IPv4. The
> date he is pushing for is April 4, 2024. "IPv4 can't go on forever,
> " Latour said. "
>>
>> It is a good question, if anybody here has tried it at scale I'd like
> to
>> know as well.
>>
>> I've spent long enough around all sorts of client device support issues
> to
>> know the results are likely to vary wildly, especially with the relatively
> new
>> support for IPv6 most devices have.
>>
>> Thanks,
>> Ayden Beeson
>>
>> -----Original Message-----
>> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Paul
> Gear
>> Sent: Thursday, 6 November 2014 4:19 PM
>> To: ausnog at lists.ausnog.net
>> Subject: Re: [AusNOG] FW: [Ap-ipv6tf] official shutdown date for IPv4. The
> date
>> he is pushing for is April 4, 2024. "IPv4 can't go on forever,
> "
>> Latour said. "
>>
>> Nice little lab test, but I'd like to see some more real-world
> examples.
>> I'm curious to know how many clients will actually honour that 1 second
> RA
>> lifetime and/or what sort of load or other symptoms it might create. It
> also
>> means troubleshooting routing tables on every client rather than on the
> first
>> hop gateways.
>>
>> Paul
>>
>> On 06/11/14 15:01, Beeson, Ayden wrote:
>>> If I'm understanding the question correctly, this might answer
> that
>> question:
>>> http://packetlife.net/blog/2011/apr/18/ipv6-neighbor-discovery-high-av
>>> ailability/
>>>
>>> Thanks,
>>> Ayden Beeson
>>>
>>> -----Original Message-----
>>> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of
>>> James Andrewartha
>>> Sent: Thursday, 6 November 2014 3:39 PM
>>> To: Mark Andrews
>>> Cc: ausnog at lists.ausnog.net
>>> Subject: Re: [AusNOG] FW: [Ap-ipv6tf] official shutdown date for IPv4.
> The
>> date he is pushing for is April 4, 2024. "IPv4 can't go on
> forever,
>> " Latour said. "
>>>
>>> On Thu, 6 Nov 2014, Mark Andrews wrote:
>>>
>>>> There is nothing preventing the router sending out revised
>>>> advertisements the moment loss of connectivity is detected.
>>>> Similarly when it is restored. Just because the normal state is
> to
>>>> send these every 30 minutes doesn't mean that they are not
> sent
>>>> sooner. Remember they are also sent in response to a router
>>>> solicitation whenever a new node connects to the network.
>>> The default announcement interval is 10 minutes, the
>>> AdvDefaultLifetime is
>>> 3 * that, ie 30 minutes. Is there an RA packet that withdraws an
> existing
>> route? Again, I ask if you've actually tried this in practice.
>>
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