RE: [v6ops] draft-ietf-6man-grand : saving lookups
"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Mon, 17 August 2020 15:01 UTC
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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
CC: IPv6 List <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>
Subject: RE: [v6ops] draft-ietf-6man-grand : saving lookups
Thread-Topic: [v6ops] draft-ietf-6man-grand : saving lookups
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Date: Mon, 17 Aug 2020 15:01:42 +0000
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Pascal, I think our discussion is diverging. I think where we differ is you seem to be assuming a host model for the end system, whereas I am assuming a multi-addressed mobile node (MN) that does link-local-only on the access network. The OMNI interface allows the MN to interact with the routing system by signing its RS messages with a coded LLA that prompts the receiving router to inject a Mobile Network Prefix (MNP) for the MN into the BGP routing system. But, the MN itself does not participate in BGP. Again, the only multicast aspects of ND that need managing are Solicited-Node multicast for NS(AR), All-Nodes multicast for RA and unsolicited NA, and All-Routers multicast for RS. In each case, the multicasts are serially-unicast to exactly that (very) small set of nodes that needs to receive them and no others. So, the NBMA multicast domain can be as large as the number of nodes on the link. Fred From: Pascal Thubert (pthubert) [mailto:pthubert@cisco.com] Sent: Monday, August 17, 2020 7:41 AM To: Templin (US), Fred L <Fred.L.Templin@boeing.com> Cc: IPv6 List <ipv6@ietf.org>; v6ops@ietf.org Subject: [EXTERNAL] Re: [v6ops] draft-ietf-6man-grand : saving lookups Hello Fred Le 17 août 2020 à 16:09, Templin (US), Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> a écrit : Hi Pascal, See below for inlines: From: Pascal Thubert (pthubert) [mailto:pthubert@cisco.com] Sent: Monday, August 17, 2020 2:39 AM To: Templin (US), Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> Cc: IPv6 List <ipv6@ietf.org<mailto:ipv6@ietf.org>>; v6ops@ietf.org<mailto:v6ops@ietf.org> Subject: [EXTERNAL] RE: [v6ops] draft-ietf-6man-grand : saving lookups Hello Fred: 100% agree. If the size of the multicast table is roughly that of the routing table, it looks particularly inefficient to maintain a multicast table for the sole purpose of DAD and lookup. We take great care in hiding that simple truth under the carpet by saying that’s a L2 problem. But it does not seem that L2 has taken the bait, has it. It depends on the L2. If the L2 is a physical media like a fabric of Ethernet switches then penetration down to L2 may not be happening. But, if the L2 is a virtual topology that is manifested by encapsulation (e.g., and overlay) then the point may be moot. Not sure what you mean. As it goes, the host does not participate to the encapsulation. This is done at the ingress router that needs to resolve the egress router. If it is known to the fabric we obtain it from tables that are maintained by the likes of BGP or LISP. Trouble is if not. If there was a multicast state then we could send the lookup to only the routers that face the SNMA group. But that would pretty much double the size of our tables, and though it is better, the MLD games still do not match the needs. So we have to broadcast. Till the hosts implement a better host to router protocol as I described in the text quoted below. As another case of what you’re describing, fabrics are optimized to use a routing protocol (e.g., BGP with eVPN) and broadcast is the last resort, but there is no multicast in between. Sadly it is still there, because the fabric is lacking a clear view of what’s there. Note also that the routing protocol is better suited to announce reachability than to perform DAD. This is where some help from the host would be needed in place of the useless IGMP games. The host can help the fabric by providing accurate information on the addresses it is effectively using, a sense of duration, a sense of order in movements, and a proof of ownership. This information should be enough to differentiate a case of multihoming / anycast with a movement. You seem to be assuming that the end system is a host that does SLAAC. I am assuming an end system model that does link-local-only with unique LLAs where no SLAAC nor DAD are necessary. True, though LLA have nothing to do there. The bottom line is that if an address is globally unique by construction then it does not need DAD. We leverage that in IoT (6LoWPAN). But you still need to announce the address to the routing system. If your host participâtes to the routing you are all set. We also leverage that in IoT (RPL). But none of that applies to classical hosts that connect to your WiFi or your campus fabric. Until the hosts implement something more suited there will be broadcast. This is quite detrimental to the perception of IPv6, even vs. IPv4. Keep safe, Thanks – Fred All the best Pascal On Aug 11, 2020, at 12:48 PM, Templin (US), Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> wrote: That is more or less the principle for NBMA, yes. But take a conservatively-sized NBMA link with 1M nodes on the link but only 2-3 of them need to receive the multicast then serially unicasting seems pretty efficient and does not disturb the vast majority of nodes that don’t care.
- I-D Action: draft-ietf-6man-grand-01 - additional… Vasilenko Eduard
- Re: I-D Action: draft-ietf-6man-grand-01 - additi… Jen Linkova
- RE: I-D Action: draft-ietf-6man-grand-01 - additi… Vasilenko Eduard
- Re: I-D Action: draft-ietf-6man-grand-01 - additi… Jen Linkova
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Nick Hilliard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Nick Hilliard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … joel jaeggli
- RE: I-D Action: draft-ietf-6man-grand-01 - additi… Vasilenko Eduard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Pascal Thubert (pthubert)
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Owen DeLong
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- RE: [EXTERNAL] Re: [v6ops] I-D Action: draft-ietf… Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Bob Hinden
- Improving ND security Ted Lemon
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [EXTERNAL] Improving ND security Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Tony Finch
- draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: Improving ND security Ted Lemon
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [EXTERNAL] Improving ND security Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- RE: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Improving ND security Fernando Gont
- Re: [v6ops] [EXTERNAL] Improving ND security Bjoern A. Zeeb
- RE: [v6ops] [EXTERNAL] Improving ND security Templin (US), Fred L
- RE: [v6ops] Improving ND security Templin (US), Fred L
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [v6ops] [EXTERNAL] Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Owen DeLong
- Re: [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Philip Homburg
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Christian Huitema
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Michael Richardson
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Michael Richardson
- Re: [EXTERNAL] Re: [v6ops] I-D Action: draft-ietf… Michael Richardson
- Re: [EXTERNAL] Improving ND security Michael Richardson
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Pascal Thubert (pthubert)
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Mark Smith
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- distributed vs centralized approaches to ND secur… Michael Richardson
- Re: distributed vs centralized approaches to ND s… Nick Hilliard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Mark Smith
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Nick Hilliard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Michael Richardson
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- RE: [EXTERNAL] Re: [v6ops] draft-ietf-6man-grand … Templin (US), Fred L
- Re: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Ted Lemon
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- RE: [EXTERNAL] Re: [v6ops] draft-ietf-6man-grand … Templin (US), Fred L
- Re: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Warren Kumari
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Templin (US), Fred L
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Manfredi (US), Albert E
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Fred Baker
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Lorenzo Colitti
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Gyan Mishra
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)