From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Baptiste Jonglez <baptiste@bitsofnetworks.org>
Cc: Juliusz Chroboczek <jch@irif.fr>,
WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: [RFC] Multicast and IPv6 Link Local Addresses
Date: Mon, 17 Apr 2017 18:55:46 +0200 [thread overview]
Message-ID: <87r30r3re5.fsf@alrua-x1> (raw)
In-Reply-To: <20170417141107.GA10609@tuxmachine.polynome.dn42> (Baptiste Jonglez's message of "Mon, 17 Apr 2017 16:11:07 +0200")
Baptiste Jonglez <baptiste@bitsofnetworks.org> writes:
> Hi Jason,
>
> On Fri, Apr 07, 2017 at 04:02:49PM +0200, Jason A. Donenfeld wrote:
>> Various networking people have been poking and prodding about
>> supporting IPv6 Link Local addresses and about supporting special
>> multicast addresses. *I MAY VERY WELL NEVER CHOOSE TO IMPLEMENT THIS*
>> but in case I do, I wanted to start spec'ing out what this might look
>> like in order to think about it better. There are a lot of odd
>> concerns to take into account, so I doubt that the below will wind up
>> as a final solution.
>
> This is good news! I can't wait to see Babel running on a wireguard
> interface with several peers, or even what OSPF would look like on such a
> network.
>
> That being said, for the purpose of a routing protocol like Babel, I think
> it still makes more sense to use only *point-to-point* wireguard links.
> Link-local and multicast communication solves the problem of discovering
> remote routing daemon, but the AllowedIPs list is still static, which does
> not make sense for a routing protocol. With point-to-point links, you can
> bypass this limitation by simply setting AllowedIPs to ::/0. Of course,
> once we have dynamic AllowedIPs, this will change :)
Yeah, for the use case I'm envisioning, I would teach the routing daemon
to update wireguard's route tables...
> There is just the minor issue of subnets that encompass both unicast and
> multicast addresses, the simplest one being ::/0. Such subnets could be
> automatically split by wireguard, or just have the "moving" semantic of
> unicast subnets. With this last option, a user would have to explicitly
> add a subnet which is *within* a multicast prefix to trigger the "cloning"
> semantic.
I agree that the least confusing would be to only treat prefixes
entirely contained in the known multicast prefixes as having "cloning"
semantics.
-Toke
prev parent reply other threads:[~2017-04-17 16:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-07 14:02 Jason A. Donenfeld
2017-04-07 14:31 ` Jason A. Donenfeld
[not found] ` <03B23E99-75C4-4598-AC0A-3C65F346675F@gmail.com>
2017-04-07 20:42 ` Jason A. Donenfeld
2017-04-08 12:43 ` Toke Høiland-Jørgensen
2017-04-08 15:44 ` George Walker
2017-04-08 9:39 ` Dan Lüdtke
2017-04-08 17:15 ` Juliusz Chroboczek
2017-04-08 19:05 ` Juliusz Chroboczek
2017-04-17 14:11 ` Baptiste Jonglez
2017-04-17 16:55 ` Toke Høiland-Jørgensen [this message]
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