Re: [sidr] Suresh Krishnan's No Objection on draft-ietf-sidr-rpki-rtr-rfc6810-bis-08: (with COMMENT)

Randy Bush <randy@psg.com> Wed, 15 February 2017 03:53 UTC

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Date: Wed, 15 Feb 2017 12:53:25 +0900
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From: Randy Bush <randy@psg.com>
To: "Suresh Krishnan" <suresh.krishnan@ericsson.com>
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Cc: draft-ietf-sidr-rpki-rtr-rfc6810-bis@ietf.org, Chris Morrow <morrowc@ops-netman.net>, sidr-chairs@ietf.org, The IESG <iesg@ietf.org>, sidr@ietf.org
Subject: Re: [sidr] Suresh Krishnan's No Objection on draft-ietf-sidr-rpki-rtr-rfc6810-bis-08: (with COMMENT)
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> I have read through the document and I still was unable to figure out
> what the Max Len field for the IPvX PDUs is being used for. It is defined
> as 
> 
> Max Length:  An 8-bit unsigned integer denoting the longest prefix
> allowed by the Prefix element.
> 
> but I was not able to find any processing rules for this. i.e. what it is
> actually used for. An example would greatly help.

wrong document.  6810 does not define prefix or prefix len either :)

you want 6482 3.3, which i do not think you want to repro here, even if
tersified

   Within a ROAIPAddress structure, the addresses field represents
   prefixes as a sequence of type IPAddress.  (See [RFC3779] for more
   details).  If present, the maxLength MUST be an integer greater than
   or equal to the length of the accompanying prefix, and less than or
   equal to the length (in bits) of an IP address in the address family
   (32 for IPv4 and 128 for IPv6).  When present, the maxLength
   specifies the maximum length of the IP address prefix that the AS is
   authorized to advertise.  (For example, if the IP address prefix is
   203.0.113/24 and the maxLength is 26, the AS is authorized to
   advertise any more specific prefix with a maximum length of 26.  In
   this example, the AS would be authorized to advertise 203.0.113/24,
   203.0.113.128/25, or 203.0.113.0/25, but not 203.0.113.0/27.)  When
   the maxLength is not present, the AS is only authorized to advertise
   the exact prefix specified in the ROA.