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Understanding Location Configuration Protocols for Network Geolocation

This document discusses the importance of Location Configuration Protocols (LCPs) in enabling end hosts to obtain location information from a Location Information Server (LIS) within the access network. It highlights the role of layer 2 in determining local network location through protocols such as DHCP, LLDP, and CDP. The analysis addresses whether a layer 7 mechanism is necessary, showcasing that while it can enhance functionality, it may also introduce complexity and risks. This exploration emphasizes the critical elements of network design and effectiveness in location services.

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Understanding Location Configuration Protocols for Network Geolocation

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  1. Location Configuration Protocols: How many more do we need? “This protocol aims to allow an end host to obtain location information, by value or by reference, from a Location Information Server (LIS) that is located in the access network.” http://www.ietf.org/internet-drafts/draft-ietf-geopriv-l7-lcp-ps-00.txt Marc Linsner

  2. Location Configuration • Network based vs. host determined • Location is a layer 2 problem • Layer 1 & 2 attributes dictate that location is derived here • Location is *local* network pertinent information • Network hosts are advised of local information via configuration protocols • DHCP, LLDP, and CDP are protocols used to advise hosts of local network parameters

  3. Layer 2 is involved • Regardless of whether there is a static wiremap database or exotic rf measurement technology, layer 2 is involved in discovering the physical location of a host. • Layer 2 media access control protocols are being modified to pass location information to a host within it’s control plane (LLDP-MED, 802.11tgv??)

  4. Is a layer 7 mechanism required? • A layer 7 LCP is a business issue, not a technical issue. • A layer 7 LCP can mask poor network design • A layer 7 LCP provides many new attack vectors • Internet experience shows that complex mechanisms fail and easy/simple ones are utilized.

  5. Internet Architecture • Internet applications separate the access layers from the application layers. This is at the heart of the Internet’s success Common point - The end device! VoIP, Inc. (Application Service Provider) Layer 7 ISP, Inc. (Internet Service Provider) Layer 3 Last Mile, Inc. (Access Provider) Layer 2

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