Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
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Date: Thu, 05 Nov 2020 15:47:46 +0100
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, v6ops list <v6ops@ietf.org>, dhcwg <dhcwg@ietf.org>
To: Timothy Winters <tim@qacafe.com>, "Bernie Volz (volz)" <volz=40cisco.com@dmarc.ietf.org>, Jen Linkova <furry13@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dhcwg/YR39AxY56K0cdJrykPqOe1ZTZUM>
Subject: Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements
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Hi, Just to be clear, are we talking about Michael’s proposed rewording/restructuring of the requirement text (here with Bernie’s link-layer wording change): R-4 To prevent routing loops, the relay SHOULD implement a configurable policy to drop potential looping packets received on any DHCP-PD client facing interfaces. The policy SHOULD be configurable on a per-client or per-destination basis. Looping packets are those with a destination address in a prefix delegated to a client connected to that interface, as follows: 1) For point-to-point links (e.g., PPPoE), when the packet’s ingress and egress interfaces match. 2) For multi-access links (e.g., ethernet), when the packet’s ingress and egress interface match, and the source link-layer and next-hop link-layer addresses match. An ICMPv6 Type 1, Code 6 (Destination Unreachable, reject route to destination) error message MAY be sent as per [RFC4443], section 3.1. The ICMP policy SHOULD be configurable. Thanks, Ian > On 4. Nov 2020, at 14:01, Timothy Winters <tim@qacafe.com> wrote: > > > I agree with Bernie, link-layer address would be an improvement to the Mac Address. > > ~Tim > > On Wed, Nov 4, 2020 at 7:15 AM Bernie Volz (volz) <volz=40cisco.com@dmarc.ietf.org <mailto:40cisco.com@dmarc.ietf.org>> wrote: > Hi ... looks good but perhaps MAC address is too Ethernet specific and just link-layer address would be better? > > - Bernie > >> On Oct 29, 2020, at 12:24 PM, "ianfarrer@gmx.com <mailto:ianfarrer@gmx.com>" <ianfarrer@gmx.com <mailto:ianfarrer@gmx.com>> wrote: >> >> >> Hi, >> >> Sorry for the delay in reply, I’ve been out of the office for the last few weeks for various reasons. >> >> Here’s a new wording proposal incorporating Jen & Bernie’s suggestions: >> >> R-4 >> To prevent routing loops, the relay SHOULD implement a configurable policy to drop packets >> received on a DHCP-PD client facing interface with a destination address in a prefix delegated >> to a client connected to that interface, as follows: For point-to-point links, when the packet’s >> ingress and egress interfaces match. For multi-access links, when the packet’s ingress and >> egress interface match, and the source MAC and next-hop MAC addresses match. An >> ICMPv6 Type 1, Code 6 (Destination Unreachable, reject route to destination) error message MAY >> be sent as per [RFC4443], section 3.1. The ICMP policy SHOULD be configurable. >> >> Thanks, >> Ian >> >>> On 15. Oct 2020, at 03:51, Jen Linkova <furry13@gmail.com <mailto:furry13@gmail.com>> wrote: >>> >>> On Wed, Oct 14, 2020 at 12:44 AM Bernie Volz (volz) <volz@cisco.com <mailto:volz@cisco.com>> wrote: >>>> If not, perhaps we just say: >>>> >>>> R-4 >>>> To prevent routing loops, the relay SHOULD implement a configurable policy to drop traffic received from an uplink interface as follows: >>> >>> I'm not sure 'from an uplink interface' makes sense. In the case of a >>> routing loop caused by an amnesiac DHCP-PD client it would be a >>> downstream interface. >>> The scenario when such traffic arrives from an uplink interface is >>> 'the uplink router believes the prefix is delegated to the client but >>> the relay does not have a route pointing to the client so it sends >>> traffic back' - so more likely 'an amnesiac relay' case. >>> >>>> For point-to-point links, when the packet's ingress and egress interfaces match. For multi-access links, when the packet's ingress and egress interface match, and the source MAC and next-hop MAC addresses match. An ICMPv6 Type 1, Code 6 (Destination Unreachable, reject route to >>>> destination) error message MAY be sent as per [RFC4443], section 3.1. The ICMP policy SHOULD be configurable. >>>> >>>> - Bernie >>>> >>>> -----Original Message----- >>>> From: ianfarrer@gmx.com <mailto:ianfarrer@gmx.com> <ianfarrer@gmx.com <mailto:ianfarrer@gmx.com>> >>>> Sent: Tuesday, October 13, 2020 9:16 AM >>>> To: Michael Richardson <mcr+ietf@sandelman.ca <mailto:mcr+ietf@sandelman.ca>>; Jen Linkova <furry13@gmail.com <mailto:furry13@gmail.com>> >>>> Cc: Bernie Volz (volz) <volz@cisco.com <mailto:volz@cisco.com>>; dhcwg <dhcwg@ietf.org <mailto:dhcwg@ietf.org>>; 6man <ipv6@ietf.org <mailto:ipv6@ietf.org>>; v6ops list <v6ops@ietf.org <mailto:v6ops@ietf.org>> >>>> Subject: Re: [dhcwg] [v6ops] [EXTERNAL] Re: Question to DHCPv6 Relay Implementors regarding draft-ietf-dhc-dhcpv6-pd-relay-requirements >>>> >>>> Hi, >>>> >>>> Thanks for all of the discussion on this. We’ve reworked the requirement as follows: >>>> >>>> R-4 >>>> To prevent routing loops, the relay SHOULD implement a configurable policy to drop client traffic as follows: For point-to-point links, when the packet's ingress and egress interfaces match. For multi-access links, when the packet's ingress and egress interface match, and the source MAC and next-hop MAC addresses match. An ICMPv6 Type 1, Code 6 (Destination Unreachable, reject route to >>>> destination) error message MAY be sent back to the client. The ICMP policy SHOULD be configurable. >>>> >>>> Thanks, >>>> Ian >>>> >>>>> On 9. Oct 2020, at 17:41, Michael Richardson <mcr+ietf@sandelman.ca <mailto:mcr+ietf@sandelman.ca>> wrote: >>>>> >>>>> >>>>> Jen Linkova <furry13@gmail.com <mailto:furry13@gmail.com>> wrote: >>>>>> I think there is confusion re: the scenario we are talking about. >>>>>> I've attached the diagram for the case which concerns me. >>>>>> So: >>>>>> - The Relay R has an interface eth0 connected to a switch S. >>>>>> - Devices A and B are connected to the same switch and using R as a >>>>>> default gateway. >>>>>> - The prefix 2001:db8::/56 was delegated to a client A via the relay R. >>>>> >>>>> a friendly amendment to your example to aid in human comprehension: >>>>> } - The prefix 2001:db8:0000:0123:/64 was delegated to a client A via the relay R. >>>>> } - R installs a route for 2001:db8:0000:0123:/64 towards A via eth0. >>>>> >>>>>> - The device B (which has an address NOT from the delegated prefix, >>>>>> but from another /64 assigned to that common link, let's sat >>>>>> 2001:db8:cafe::/64) sends a packet to an address from the delegated >>>>> >>>>> now, my brain can more clearly see that 2001:db8:cafe::/64 is not >>>>> within 2001:db8:0000:0123:/64, while I had to use a few extra brain >>>>> cells to see that it wasn't in that ::/56 :-) >>>>> >>>>>> What I'd expect to happen (with DHCP-PD or without - e.g. if R has a >>>>>> static route towards A, not a dynamic route produced by PD): >>>>>> - the packet is sent to A. Well, if A does not have a route to >>>>>> 2001:db8::42 then indeed a routing loop might happen. But if A does >>>>>> have a route, the packet will be delivered. >>>>> >>>>>> What seems to be required by R4: >>>>>> - R detects that the packet is received via eth0 and needs to be sent >>>>>> back to eth0. R4 seems to require such packets to be dropped. >>>>>> So if B would never be able to communicate to any address in the >>>>>> delegated prefix, right? >>>>> >>>>>> Am I missing anything? >>>>> >>>>> I think that you got it right. >>>>> >>>>>>> Perhaps the missing piece of the rule is don’t send it back to where it came from, based on link layer addresses (or link if point-to-point). >>>>> >>>>>> Yes. If R4 was saying 'drop the packet if it comes from the same >>>>>> link-layer address you are going to send it back' - it would make >>>>>> total sense. But I don't think routers do *that*. >>>>> >>>>> Yes, if we made the check on L2 address, then it would work. >>>>> And I agree that routers are exactly doing that. >>>>> >>>>> I think that it also works if B is a router with additional interfaces >>>>> downstream, unless there are multiple paths. >>>>> >>>>> -- >>>>> Michael Richardson <mcr+IETF@sandelman.ca <mailto: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 <mailto:ipv6@ietf.org> >>>>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 <https://www.ietf.org/mailman/listinfo/ipv6> >>>>> -------------------------------------------------------------------- >>>> >>> >>> >>> -- >>> SY, Jen Linkova aka Furry >> > _______________________________________________ > v6ops mailing list > v6ops@ietf.org <mailto:v6ops@ietf.org> > https://www.ietf.org/mailman/listinfo/v6ops <https://www.ietf.org/mailman/listinfo/v6ops>
- [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