Changes (by bernard_aboba@…):
* status: new => closed
* resolution: => fixed
Comment:
Recommended resolution:
Change Section 2.2.1.2 to the following:
2.2.1.2. Server Version Selection
DHCPv6 servers implementing this specification MUST send
version 1 responses. A DHCPv4 server implementing this specification
MUST support sending version 1 responses and SHOULD support sending
version 0 responses. A DHCPv4 server that provides location
information cannot provide options with both version 0 and version 1
formats in the same response. This is not useful since receiving two
copies of the same Option (either in the same response or a separate
response) causes a DHCPv4 client to replace the information in the
old Option with the information in the new Option.
A DHCPv4 server uses configuration to determine which version to send
in a response. For example, where a mixture of version 0 and version
1 clients are expected, the DHCPv4 server could be configured to send
version 0 or version 1 depending on configuration (possibly making
the choice based on information such as the client MAC address).
Where few version 0 clients are expected, the DHCPv4 server could be
configured to send only version 1 responses. Version 0 options will
provide resolution, while version 1 options will provide an area of
uncertainty.
An RFC 3825 DHCPv4 client that receives a version 1 option
defined in this document will either reject the Option, or will not
understand the additions to the Datum field and will misinterpret the
LongUnc, LatUnc, and AltUnc values. If the RFC 3825 DHCPv4 client
does not reject the option and utilizes the location data it will
most likely assume a datum. Assuming one of the RFC 3825 datums
causes correct interpretation of Latitude/Longitude/Altitude values.
The values for LongUnc/LatUnc/AltUnc are mistakenly interpreted as
representing significant digits. The resultant location value will
be in error up to a full degree of latitude and longitude, and a full
increment of altitude.
This results in a version 0-only DHCPv4 client either not obtaining
location information (with no ability to indicate to the server that
version 1 was unsupported), or misinterpreting the option.
Therefore, if it is not known whether all DHCPv4 clients support
version 1,
and it is not possible for the DHCPv4 server to distinguish between
version 0
and version 1 DHCPv4 clients by some means, by default the DHCPv4
server
SHOULD send a version 0 response.
--
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Reporter: bernard_aboba@… | Owner: bernard_aboba@…
Type: defect | Status: closed
Priority: minor | Milestone: draft-ietf-geopriv-3825bis
Component: rfc3825bis | Version: 1.0
Severity: Submitted WG Document | Resolution: fixed
Keywords: |
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Ticket URL: <https://trac.tools.ietf.org/wg/geopriv/trac/ticket/40#comment:1>
geopriv <http://tools.ietf.org/geopriv/>
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