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DHCP option

https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml

Option 55 sub 144 Geo Location

datatracker

ietf

doc

/rfc6225#section-2.2

https://community.polycom.com/t5/VoIP-SIP-Phones/FAQ-Utilizing-VLAN-s-with-Polycom-phones/td-p/38100

Code Block

title	option 55 sub-option 144
collapse	true

2

9.

2.2

8. Parameter

DHCPv4

Request

GeoLoc

List

Option


   This

The

option

format

is

of

used

the

by

DHCPv4

GeoLoc

DHCP

Option

client

is

to

as

request

follows:

values for specified
   configuration

0

parameters.  The list of requested parameters is
   specified as n octets, where each octet is

1

a valid DHCP option code
   as defined in this document.

   The client

2

MAY list the options in order of preference.  The DHCP
   server is not required to

3

return the options in the requested

0

order,

1

2

3

4

but

5

MUST

6

try

7

to

8

insert

9

the

0

requested

1

options

2

in

3

the

4

order

5

requested

6

7

8

9

by

0

the

1

client.

2

3

4

5

6

The

7

code

8

for

9

this

0

option

1

is 55.  Its

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |

minimum length is 1.

    Code

144

Len

|

Length | LatUnc |

Option Codes

Latitude +

+-

+

-+-

+

-+-

+

-+-

+

-+-

+-+-+-+-+-+-+-+-+

+

+-+

Latitude (cont'd)

55 |

LongUnc

n  |

+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Longitude | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | AType | AltUnc | Altitude + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Alt.(cont'd) |Ver| Res |Datum| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Code: 8 bits. The code for the DHCPv4 GeoLoc Option (144). Length: 8 bits. The length of the option, in octets. For version 1, the option length is 16. LatUnc: 6 bits. When the Ver field = 1, this field represents latitude uncertainty. The contents of this field are undefined for other values of the Ver field. Latitude: A 34-bit fixed-point value consisting of 9 bits of integer and 25 bits of fraction, interpreted as described in Section 2.3. LongUnc: 6 bits. When the Ver field = 1, this field represents longitude uncertainty. The contents of this field are undefined for other values of the Ver field. Longitude: A 34-bit fixed-point value consisting of 9 bits of integer and 25 bits of fraction, interpreted as described in Section 2.3. AType: 4 bits. Altitude Type, defined in Section 2.4. AltUnc: 6 bits. When the Ver field = 1, this field represents altitude uncertainty. The contents of this field are undefined for other values of the Ver field. Altitude: A 30-bit value defined by the AType field, described in Section 2.4. Ver: The Ver field is 2 bits, providing for four potential versions. This specification defines the behavior of version 1. The Ver field is always located at the same offset from the beginning of the option, regardless of the version in use. Res: 3 bits. The Res field is reserved. These bits have been used by [IEEE-802.11y], but are not defined within this specification. Datum: 3 bits. The Map Datum used for the coordinates given in this option.

c1 |  c2 | ...
   +-----+-----+-----+-----+---

Router > Device > Network interface > DHCP server > Address-pool config

“Custom Options”.

https://datatracker.ietf.org/doc/html/rfc6225#section-2.2

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