Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
Bob Hinden <bob.hinden@gmail.com> Wed, 14 October 2020 21:46 UTC
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From: Bob Hinden <bob.hinden@gmail.com>
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Date: Wed, 14 Oct 2020 14:46:44 -0700
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Cc: Bob Hinden <bob.hinden@gmail.com>, Michael Richardson <mcr+ietf@sandelman.ca>, dhcwg <dhcwg@ietf.org>, IPv6 List <ipv6@ietf.org>, v6ops list <v6ops@ietf.org>
To: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
References: <5f119ffbb67245a9b9d34a0d8f7398f4@boeing.com> <10487.1602608586@localhost> <378d3420690246bbae253fb15be8c9a7@boeing.com> <19627.1602701863@localhost> <1b34b9bec59e4a00af8b9d8f182d23ff@boeing.com>
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Subject: Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
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With my chair hat on, is there a reason why this discussion is being copied to the 6MAN w.g.? 6MAN doesn’t maintain DHCP related items. Please remove ipv6@ietf.org from this thread. Bob > On Oct 14, 2020, at 12:19 PM, Templin (US), Fred L <Fred.L.Templin@boeing.com> wrote: > > Hi Michael, > >> -----Original Message----- >> From: Michael Richardson [mailto:mcr+ietf@sandelman.ca] >> Sent: Wednesday, October 14, 2020 11:58 AM >> To: Templin (US), Fred L <Fred.L.Templin@boeing.com> >> Cc: ianfarrer@gmx.com; Jen Linkova <furry13@gmail.com>; dhcwg <dhcwg@ietf.org>; v6ops list <v6ops@ietf.org>; 6man >> <ipv6@ietf.org> >> Subject: Re: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay- >> requirements >> >> >> Templin (US), Fred L <Fred.L.Templin@boeing.com> wrote: >>> Michael, what I was referring to below as "failure" is the proxy case when >>> there is an L2 proxy P between the client and relay (e.g., >>> RFC489). There >> >> RFC4389 describes an ND Proxy. >> Is that really an L2 proxy? > > Yes, I believe it is an L2 proxy. > >> It seems like it also must be contain either an L2-bridge, or must have the >> L3-routing table entries if it would really be capable of passing DHCPv6-PD >> prefixes through it. > > The only thing it has that includes L3 information is neighbor cache entries that > keep track of the client's actual L2 address on the downstream link segment, > but rewrites the client's L2 address to its own L2 address when forwarding > onto an upstream link segment. (In the reverse direction, it receives packets > destined to its own L2 address but the client's L3 address on the upstream > link segment, then rewrites the L2 address to the client's L2 address when > forwarding onto the downstream link segment.) > >> Can you explain how such a device would normally work for a client device >> A,B,C,D doing DHCPv6-PD through it? > > Sure. A sends a DHCPv6 Solicit using its IPv6 link-local address as the source, > and its L2 address as the link-layer source. The proxy converts the link-layer > source to its own L2 address when forwarding the DHCPv6 solicit onto the > upstream link. When the DHCPv6 Reply comes back, the IPv6 destination is > that of client A, but the link-layer destination is the L2 address of the proxy. > The proxy then converts the L2 destination to the address of client A and > forwards it on to the client. > >> And is the failure one where the router "R" fails to drop traffic it should, >> one where the router "R" drops traffic that it shouldn't? > > I was thinking more along the lines of the latter; if the only way that A has > for talking to B, C, D, etc. is by going through R, it wouldn't work if R was > unconditionally dropping everything. > > Thanks - Fred > >> -- >> Michael Richardson <mcr+IETF@sandelman.ca> . o O ( IPv6 IøT consulting ) >> Sandelman Software Works Inc, Ottawa and Worldwide >> >> >> > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > --------------------------------------------------------------------
- [dhcwg] Question to DHCPv6 Relay Implementors reg… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Alexandre Petrescu
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… otroan
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… otroan
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Question to DHCPv6 Relay I… Templin (US), Fred L
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Michael Richardson
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Alexandre Petrescu
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… Templin (US), Fred L
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… ianfarrer
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Ole Troan
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bjørn Mork
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Ole Troan
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bjørn Mork
- Re: [dhcwg] [EXTERNAL] Re: Question to DHCPv6 Rel… Jen Linkova
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … ianfarrer
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Michael Richardson
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Philip Homburg
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Michael Richardson
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Michael Richardson
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Michael Richardson
- [dhcwg] how do routers with DHCPv6 relays learn w… Michael Richardson
- Re: [dhcwg] [EXTERNAL] [v6ops] Re: Question to DH… Bob Hinden
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … otroan
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Timothy Winters
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Ted Lemon
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ms. Li HUANG
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Michael Richardson
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Jen Linkova
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Timothy Winters
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… Bernie Volz (volz)
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer
- Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DH… ianfarrer