LinkLayer Hints for Detecting Network Attachments

1
Link-Layer Hints for Detecting Network
Attachments

• ltdraft-yegin-dna-l2-hints-01gt
• Alper Yegin, Eric Njedjou,
• Siva Veerepalli, Nicolas Montavont,
• Thomas Noel

2
Objective

• draft-yegin-dna-l2-hints-01.txt
• Identify how link-layer can assist DNA algorithms
• Catalogue existing link-layers and their
  capabilities
• GPRS
• cdma2000
• IEEE 802.11

3
Triggers

• Event notifications from the link-layer will
  trigger the DNA algorithm
• Link up
• PDP context activation on GPRS
• PPP establishment on cdma2000
• (re)association on IEEE 802.11f or secure
  association on IEEE 802.11i
• Link down
• PDP context deactivation on GPRS
• PPP tear-down on cdma2000
• Deauthentication/disassociation on IEEE 802.11f,
  disassociation on IEEE 802.11i

4
Hints

• Hints may be optionally provided along the
  triggers, which may help optimize the DNA process
• The IP address is provided during PDP context
  activation on GPRS
• Same with the PPP on cdma2000
• IEEE 802.11 not straight forward

5
Backup slides
6
GPRS
SGSN
GGSN
MN
MN Mobile Node SGSN GPRS Access Point GGSN
GPRS Access Router
7
cdma2000
MS Mobile Station BS Base Station PCF Packet
Control Function PDSN Packet Data Serving Node
8
IEEE 802.11
New Access Router
New Access Point
Mobile
Probe Request
Active scanning
Probe Response
Beacon
Passive scanning
Authentication
Authentication
Assoc. Request
Assoc. Response
Router Solicitation
Router Advertisement
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Hints in IEEE 802.11

• No L3 configuration in L2
• Need for an identifier to associate links with
  networks (configurations)
• BSSID (L2 address of AP)?
• No one-to-one mapping to a network
• SSID (service set identifier)?
• Same SSID might be used across a routed network.
• SSID does not mean much when the network is
  selected during the authentication phase (dynamic
  VLAN assignment)
• Any useful hints for DNA without modifying IEEE
  802.11?