Re: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
Michael Richardson <mcr+ietf@sandelman.ca> Thu, 15 October 2020 00:09 UTC
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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
cc: "ianfarrer@gmx.com" <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
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Date: Wed, 14 Oct 2020 20:08:56 -0400
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Templin (US), Fred L <Fred.L.Templin@boeing.com> wrote: >> 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. But, how does the proxy know how to forward the prefix that A gets on to A? The router, having seen A's L2 address on the DHCPv6-PD, and/or having done a ND on A and receiving L2's address, will punt the traffic to the proxy. Wouldn't the proxy have to observe the DHCPv6-PDs to know what prefixes are being delegated? I didn't think that was a thing. I think that it just doesn't work. If it is a thing, then the Proxy will have an L3 route for the prefix that was delegated so that it can forward traffic from R on to A. >> 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. If A and B are behind the same Proxy, and each has a prefix delegated to them, and they have to go all the way to R to get traffic forwarded because they see R's RAs, not ones that the Proxy has made up, then indeed, R would see the Proxy's L2 address as src/dst, and it should drop traffic. But, I would claim that the Proxy should have seen the traffic to R, intercepted it, and used it's routing table to get the Prefix-A/Prefix-B traffic to B. -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [ -- Michael Richardson <mcr+IETF@sandelman.ca> . o O ( IPv6 IøT consulting ) Sandelman Software Works Inc, Ottawa and Worldwide
- Question to DHCPv6 Relay Implementors regarding d… ianfarrer
- RE: [EXTERNAL] [dhcwg] 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: Question to DHCPv6 Relay Implementors regardi… Michael Richardson
- Re: [dhcwg] Question to DHCPv6 Relay Implementors… Jen Linkova
- Re: Question to DHCPv6 Relay Implementors regardi… ianfarrer
- RE: [EXTERNAL] Re: [dhcwg] Question to DHCPv6 Rel… Templin (US), Fred L
- Re: [EXTERNAL] Re: [dhcwg] Question to DHCPv6 Rel… ianfarrer
- Re: Question to DHCPv6 Relay Implementors regardi… Michael Richardson
- RE: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Bernie Volz (volz)
- RE: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Ole Troan
- RE: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Templin (US), Fred L
- RE: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: [dhcwg] Question to DH… Bernie Volz (volz)
- Re: [v6ops] [EXTERNAL] Re: [dhcwg] 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: [v6ops] [EXTERNAL] Re: Question to DHCPv6 Rel… Bjørn Mork
- Re: [v6ops] [EXTERNAL] Re: Question to DHCPv6 Rel… Ole Troan
- Re: [v6ops] [EXTERNAL] Re: Question to DHCPv6 Rel… Bjørn Mork
- Re: [EXTERNAL] Re: [dhcwg] Question to DHCPv6 Rel… Jen Linkova
- RE: [dhcwg] Question to DHCPv6 Relay Implementors… Vasilenko Eduard
- RE: [dhcwg] Question to DHCPv6 Relay Implementors… Vasilenko Eduard
- 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: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Michael Richardson
- RE: [EXTERNAL] Re: [dhcwg] [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: [v6ops] [dhcwg] Re: Question to DHCPv6 Relay … Philip Homburg
- RE: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Templin (US), Fred L
- Re: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Michael Richardson
- RE: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Templin (US), Fred L
- Re: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Bob Hinden
- RE: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Bob Hinden
- RE: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Templin (US), Fred L
- Re: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Bob Hinden
- Re: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Michael Richardson
- Re: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Michael Richardson
- how do routers with DHCPv6 relays learn when they… Michael Richardson
- Re: [EXTERNAL] [dhcwg] [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: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Templin (US), Fred L
- RE: [EXTERNAL] [dhcwg] [v6ops] Re: Question to DH… Vasilenko Eduard
- RE: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Templin (US), Fred L
- RE: [dhcwg] [v6ops] Re: Question to DHCPv6 Relay … Vasilenko Eduard
- 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: [EXTERNAL] Re: [dhcwg] [v6ops] Re: Question t… Templin (US), Fred L
- Re: [dhcwg] [EXTERNAL] Re: [v6ops] Re: Question t… Ms. Li HUANG