Re: [v6ops] FW: Can you please review and comment on draft-xiao-v6ops-nd-deployment-guidelines
Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 24 October 2021 19:29 UTC
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To: Xipengxiao <xipengxiao@huawei.com>, Gert Doering <gert@space.net>
Cc: "v6ops@ietf.org" <v6ops@ietf.org>, "gyan.s.mishra@verizon.com" <gyan.s.mishra@verizon.com>
References: <5e866a598eab4d48bdcbe8b7d566866f@huawei.com> <a158b8aa-9507-e134-9b95-d0aacb63123c@gmail.com> <4e5d07b50df549b3965e02d61446a2ae@huawei.com> <YXUUVdN61Ks2od+/@Space.Net> <b1faefbcea414771b0d91b1b0dd21649@huawei.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Mon, 25 Oct 2021 08:29:14 +1300
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Subject: Re: [v6ops] FW: Can you please review and comment on draft-xiao-v6ops-nd-deployment-guidelines
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> But the fact is we give each mobile phone is /64 today, and each RG (resident gateway) a /56. So giving a host a /64 is already a widely existed current practice. Note that if a mobile device (maybe not a phone!) is acting as a local hotspot, it needs a prefix, not an address, and /64 is the longest prefix that respects the current addressing architecture. Even that does not allow subnetting. Regards Brian Carpenter Thinking of the IETF standards process: https://xkcd.com/2530/ On 25-Oct-21 05:04, Xipengxiao wrote: > Hi Gert, > > Thank you for your time to review and comment. Please see my response in line. > >> -----Original Message----- >> From: Gert Doering [mailto:gert@space.net] >> Sent: Sunday, October 24, 2021 10:08 AM >> To: Xipengxiao <xipengxiao@huawei.com> >> Cc: v6ops@ietf.org; gyan.s.mishra@verizon.com >> Subject: Re: [v6ops] FW: Can you please review and comment on draft-xiao- >> v6ops-nd-deployment-guidelines >> >> Hi, >> >> On Sat, Oct 23, 2021 at 07:26:12PM +0000, Xipengxiao wrote: >>>> 2. I expect a lot of objections to UPPH. It really is a ridiculous >>>> waste of address space, unless we can reduce the subnet size with a >>>> prefix greater than /64, and that seems very difficult in the IETF. >>> >>> [XX] While I acknowledge that giving each host a /64 may seem >>> wasteful, in reality it may not be so bad, for 2 reasons (1) I heard >>> that RIR will give /29 to an applicant without requiring special >>> justification. This will provide 2**35=32 billion /64's - more than >>> enough I would think >> >> The /29 is intended to number many individual customers. ISPs are giving /56s >> out of this to "SOHO" customers, and /48s to "business customers". > > [XX] A business Wi-Fi deployment can be considered as a " business customer", and be given a /48 as you suggest. This will allow 64K hosts if each host gets a /64. Seems like a reasonable arrangement to me. > >> You can't assume that these are all free to be burned in arbitrary numbers of >> /64s on wifi deployments. >> >> (I, for one, will never ever deploy technology that will require me to allocate >> something like a /54 to a wifi network, just to be able to serve 1000 mobile >> clients [/54 = 2^10 = 1024 /64s] - which is not even very large for a corp wifi) > > [XX] Your opinion is respected. But the fact is we give each mobile phone is /64 today, and each RG (resident gateway) a /56. So giving a host a /64 is already a widely existed current practice. > >>> (2) We are giving a /64 to each mobile phone. If we can afford that >>> in this scenario (with by far the largest number of hosts), we should >>> be able to afford that in other scenarios (with smaller number of >>> hosts). Do you agree? >> >> This is totally not comparable, as there are many layers of address not involved >> here. Mobile ISPs get the /29 "all for themselves", and the way stuff attaches >> to the mobile network is way different from the way wifi segments are >> attached to normal building networks. > > [XX] First our draft is not specific to Wi-Fi. Second, why giving a host a /64 or not depends on " the way stuff attaches > to the network"? > >> >> (I like the idea of being able to delegate a /96 with DHCPv6-PD to each device, >> to appease Lorenzo and finally be done with the everlasting >> DHCPv6 vs. Android discussion - but the numbers for /64 are really not working >> out) > > [XX] I have no problem with what you suggested, but that's a different discussion. Please note that our draft didn't prescribe any new solution (or advocate giving each host a /64). All it did was reviewing the existing ND issues and solutions, and suggested how to select a solution based on the deployment scenario. > > Thanks again for your time. It's appreciated! > > XiPeng > > _______________________________________________ > v6ops mailing list > v6ops@ietf.org > https://www.ietf.org/mailman/listinfo/v6ops >
- [v6ops] FW: Can you please review and comment on … Xipengxiao
- Re: [v6ops] FW: Can you please review and comment… Gert Doering
- Re: [v6ops] FW: Can you please review and comment… Xipengxiao
- Re: [v6ops] FW: Can you please review and comment… Brian E Carpenter