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

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Thu, 08 October 2020 22:08 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Ole Troan <otroan@employees.org>
CC: "Bernie Volz (volz)" <volz@cisco.com>, "ianfarrer@gmx.com" <ianfarrer@gmx.com>, dhcwg <dhcwg@ietf.org>, v6ops list <v6ops@ietf.org>, 6man <ipv6@ietf.org>
Thread-Topic: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
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Date: Thu, 8 Oct 2020 22:08:37 +0000
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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,

> -----Original Message-----
> From: Ole Troan [mailto:otroan@employees.org]
> Sent: Thursday, October 08, 2020 3:00 PM
> To: Templin (US), Fred L <Fred.L.Templin@boeing.com>
> Cc: Bernie Volz (volz) <volz@cisco.com>om>; ianfarrer@gmx.com; dhcwg <dhcwg@ietf.org>rg>; v6ops list <v6ops@ietf.org>rg>; 6man
> <ipv6@ietf.org>
> Subject: Re: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-
> requirements
> 
> 
> > On 8 Oct 2020, at 23:55, Templin (US), Fred L <Fred.L.Templin@boeing.com> wrote:
> >
> > Now, client B sends packets destined to an address in A to R, and R forwards the
> > packets to client A since it still has a route for A. When the packets arrive at A,
> > however, A forwards them back to R since it has "forgotten" that it holds the
> > prefix A. When R receives the packets from A with destination address also
> > from prefix A, it must drop them instead of forwarding them back to A to
> > avoid looping.
> 
> This is indeed what the requirement in the draft says.
> This isn’t quite obvious how to implement, which why I brought up the question if anyone had implemented this. And if it’s supported
> in hw etc.

I can tell you how we will do it in AERO/OMNI. R will have an OMNI interface
neighbor cache entry (NCE) for A that links the prefix A with the link-layer
address of A. Then, when R receives a packet from A's link-layer address it
consults its NCE to see that A is the holder of prefix A and therefore not a
valid source of packets with destination address in A. We will have this in
our code soon - thanks for the catch!

Fred

> Ole=