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

otroan@employees.org Fri, 16 October 2020 18:30 UTC

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Subject: Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
From: otroan@employees.org
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Date: Fri, 16 Oct 2020 20:30:31 +0200
Cc: Vasilenko Eduard <vasilenko.eduard@huawei.com>, Michael Richardson <mcr+ietf@sandelman.ca>, v6ops list <v6ops@ietf.org>, 6man WG <ipv6@ietf.org>, dhcwg <dhcwg@ietf.org>
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To: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
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> 
> We are talking past each other, and one of us does not have a clear understanding
> of the issue at the heart of the discussion which I see as a forwarding plane issue
> having nothing to do with the control plane.

Well, the forwarding plane just does what it's told.
When you set up DHCP with static routes at both ends, which are maintained by snooping on a protocol. It's not inconceivable that there are cases where you'd get a routing loop. Good thing we have the HLIM field. ;-)

Markus' draft is still the most authorative document discussion the solution space:
https://tools.ietf.org/html/draft-stenberg-v6ops-pd-route-maintenance-00

The CPE requirements document could have had a requirement that it should never forward a packet received on the WAN interface back out the WAN interface.

Cheers,
Ole

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