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Re: [dhcwg] I-D Action: draft-ietf-dhc-dhcpv6-pd-relay-requirements-00.txt

"Bernie Volz (volz)" <volz@cisco.com> Wed, 08 April 2020 14:24 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: "otroan@employees.org" <otroan@employees.org>
CC: Timothy Winters <tim@qacafe.com>, "draft-ietf-dhc-dhcpv6-pd-relay-requirements@ietf.org" <draft-ietf-dhc-dhcpv6-pd-relay-requirements@ietf.org>, "dhcwg@ietf.org" <dhcwg@ietf.org>
Thread-Topic: [dhcwg] I-D Action: draft-ietf-dhc-dhcpv6-pd-relay-requirements-00.txt
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Date: Wed, 08 Apr 2020 14:24:19 +0000
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Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-dhcpv6-pd-relay-requirements-00.txt
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> A more specific rule for that is in 7084 and possibly in 3633, requiring a blockhole route on the requesting router for the delegated prefix.

But Tim is talking about BEFORE the PD is assigned?

Do you know which requirement that is in 7084? My quick glance/search at the document did not turn up such a requirement? 

I doubt 3633 applies because that is only about PD and not what happens before PDs are assigned?

And as Tim raised it, seems likely that it must be happening frequently enough that whatever may be there is not clear enough?

Is there ever a case where a CPE should forward a packet received on the WAN interface back out the WAN interface? Probably not as it is designed to be router between the WAN and LAN interfaces only.

- Bernie

-----Original Message-----
From: otroan@employees.org <otroan@employees.org> 
Sent: Wednesday, April 8, 2020 10:13 AM
To: Bernie Volz (volz) <volz@cisco.com>
Cc: Timothy Winters <tim@qacafe.com>; draft-ietf-dhc-dhcpv6-pd-relay-requirements@ietf.org; dhcwg@ietf.org
Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-dhcpv6-pd-relay-requirements-00.txt

> Sounds like a useful issue to try to address – the DHC connection is because of the DHCP issues.
>  
> And, I assume looping occurs because packets cycle between SP router and CPE until TTL/HOP expires?
>  
> Do you have a suggestion as to what the CPE should do in this case? For example, are you suggesting that the CPE drop received traffic (except for DHCP and perhaps some other limited traffic addressed to it)?

A CPE should never provide transit.
I.e it should never forward a packet received on it's WAN interface back out the WAN interface.

A more specific rule for that is in 7084 and possibly in 3633, requiring a blockhole route on the requesting router for the delegated prefix.

Ole

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