Re: [v6ops] out-of-focus: why DHCPv6 breaks Android computers?
Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 30 October 2019 15:51 UTC
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To: Jen Linkova <furry13@gmail.com>, "Rajiv Asati (rajiva)" <rajiva@cisco.com>
Cc: Ted Lemon <mellon@fugue.com>, "v6ops@ietf.org" <v6ops@ietf.org>
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Wed, 30 Oct 2019 16:51:43 +0100
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Subject: Re: [v6ops] out-of-focus: why DHCPv6 breaks Android computers?
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Le 30/10/2019 à 05:26, Jen Linkova a écrit : > On Wed, Oct 30, 2019 at 2:35 PM Rajiv Asati (rajiva) > <rajiva@cisco.com> wrote: >> Yes, same prefix can be specified in DHCPv6 server and router RA >> PIO. If ever a conflict between the IPv6 addresses at a host, then >> the host could use DAD to resolve the conflict (and recycle the >> SLAAC derived address). Standard machinery. > > Well, I guess the more tricky case is 'a host got an address from > DHCP, DAD is failing because another host already assigned the same > IP (manually or via SLAAC)'. What's next (besides sending DECLINE > back to the server)? Split-brain condition in address assignments is > hard. The more I read this thread the less I see the point of having > DHCPv6 (for address assignment) when we have SLAAC. > > Oh...I think I'm breaking the promise I made to myself ("never get > involved into SLAAC vs DHCP discussion ever') again...;)) I dont want to discuss a vs b either. Alex > > >> -----Original Message----- From: Alexandre Petrescu >> <alexandre.petrescu@gmail.com> Date: Tuesday, October 29, 2019 at >> 2:32 PM To: Rajiv Asati <rajiva@cisco.com>, Ted Lemon >> <mellon@fugue.com> Cc: "v6ops@ietf.org" <v6ops@ietf.org> Subject: >> Re: [v6ops] out-of-focus: why DHCPv6 breaks Android computers? >> >> >> >> Le 29/10/2019 à 13:38, Rajiv Asati (rajiva) a écrit : >>> >>> Indeed. CPE router should allow keeping both M and A flags, to >>> allow simultaneous usage of DHCPv6 and SLAAC by the hosts. >> >> At high level, it makes sense to require to allow simultaneous DHCP >> and SLAAC usage on a same subnet; a private email suggests the >> same. With that, Android and Windows would live ok side-by-side on >> same subnet. >> >> Further, thinking about how to implement the req, one would wonder >> whether the prefix in PIO with A flag set in an RA with M set, >> would be the same as the prefix used by the DHCP Server to form and >> deliver addresses? >> >> (if yes, I think that is difficult to achieve: (1) difficult to put >> same prefix in the software implementing RA sending, and in the >> DHCP server connfig files and (2) difficult to make sure the Server >> does not form an address for a Client, address that a Host has >> already formed in the same prefix). >> >> (because of that reason, I think that trying to implement that >> requirement would lead to designating a prefix for SLAAC and >> another prefix for DHCP; that may sound a little bit as a waste). >> >> Alex >> >>> >>> About time to update RFC7084 - >>> https://tools.ietf.org/html/rfc7084#section-4.3 >>> >>> >>> >>> Cheers, Rajiv >>> >>> >>>> On Oct 29, 2019, at 7:22 AM, Ted Lemon <mellon@fugue.com> >>>> wrote: >>>> >>>> On Oct 29, 2019, at 6:37 AM, Alexandre Petrescu >>>> <alexandre.petrescu@gmail.com >>>> <mailto:alexandre.petrescu@gmail.com>> wrote: >>>>> Well no. After activating DHCPv6 on CPE the CPE sent three >>>>> RAs changing the Lifetime and flipping the M(anaged) and >>>>> A(utonomous) flags. >>>>> >>>>> Packet dumps available upon request. >>>> >>>> That’s the problem. It should turn on the managed bit but >>>> not turn off the autonomous bit. The two can validly be on at >>>> the same time. >>>> >>>> Of course, since their meanings are deprecated, it’s not too >>>> surprising that implementations get this wrong. >>>> >>>> _______________________________________________ v6ops mailing >>>> list v6ops@ietf.org >>>> https://www.ietf.org/mailman/listinfo/v6ops >> >> >> _______________________________________________ v6ops mailing list >> v6ops@ietf.org https://www.ietf.org/mailman/listinfo/v6ops > > >
- [v6ops] out-of-focus: why DHCPv6 breaks Android c… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Eric Vyncke (evyncke)
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… JORDI PALET MARTINEZ
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… JORDI PALET MARTINEZ
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Simon Hobson
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Scott Morizot
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Jen Linkova
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Ted Lemon
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Rajiv Asati (rajiva)
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… STARK, BARBARA H
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Ted Lemon
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Ole Troan
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Ted Lemon
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Jen Linkova
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Rajiv Asati (rajiva)
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Jen Linkova
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Ted Lemon
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu
- Re: [v6ops] out-of-focus: why DHCPv6 breaks Andro… Alexandre Petrescu