Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements

Bjørn Mork <bjorn@mork.no> Fri, 09 October 2020 08:01 UTC

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To: Ole Troan <otroan@employees.org>
Cc: "Templin \(US\)\, Fred L" <Fred.L.Templin@boeing.com>, dhcwg <dhcwg@ietf.org>, v6ops list <v6ops@ietf.org>, 6man <ipv6@ietf.org>, "Bernie Volz \(volz\)" <volz@cisco.com>
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Date: Fri, 09 Oct 2020 10:01:31 +0200
In-Reply-To: <36C7513E-BDF1-4189-89F6-5BB46797FB99@employees.org> (Ole Troan's message of "Fri, 9 Oct 2020 09:43:07 +0200")
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Subject: Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
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Ole Troan <otroan@employees.org> writes:
>> On 9 Oct 2020, at 09:37, Bjørn Mork <bjorn@mork.no> wrote:
>> 
>> I don't know anything about hardware implementations or scaling in
>> general, but this seems easy to implement using the Linux kernel routing
>> facilities:
>> 
>> ip -6 rule add pref 1234 iif if_A to prefix_A blackhole
>> 
>> where 'if_A' is the interface connecting A to R and 'prefix_A' is the
>> prefix assigned to A.
>
> I think the premise here is that it’s a multiaccess interface. So
> wouldn’t that rule break traffic from B to A? If the premise here is
> that both customer A and B are on the same interface.
>
> If it was one l3 interface per customer then sure it’s easy. 

Right.  The requirement is impossible with that premise. So that surely
cannot be the intention?  I agree that this should be clarified.



Bjørn