1. On ESS Mesh Device Discovery
May 2004
On ESS Mesh Device Discovery
Tyan-Shu Jou, Ted Kuo, and Ming Sheu
Janusys Networks, Inc.
May 11, 2004
Tyan-Shu Jou, et al., Janusys Networks

2. Month 2002
doc.: IEEE /xxxr0
May 2004
General Requirements
Automatic establishment of WDS “connections” between mesh nodes
Mutual authentication between mesh nodes
Negotiation of encryption protection between mesh nodes based on policies
Tyan-Shu Jou, et al., Janusys Networks
John Doe, His Company

3. Discovery Models: Advertising vs. Probing
Month 2002
doc.: IEEE /xxxr0
May 2004
Discovery Models: Advertising vs. Probing
Advertising:
Advertising ESS Mesh capability in beacons
A mesh-capable device scans all possible channels for beacons and joins mesh network
Probing:
A mesh-capable device sends out “Hello” messages in multiple channels
Others that are willing to accept new mesh node respond with “Hello-Reply”
Tyan-Shu Jou, et al., Janusys Networks
John Doe, His Company

4. Authentication Methods
May 2004
Authentication Methods
Mutual authentication should be performed between neighboring nodes
Possible authentication methods:
Open
Pre-shared Key
Certificates
Tyan-Shu Jou, et al., Janusys Networks

5. May 2004
Security Negotiation
Encryption protection should be negotiated after mutual authentication is done
A unique pair-wise key between two mesh nodes should be derived for transmitting uni-cast frames in between these two nodes
Group key is needed if broadcast WDS-frames are to be used
Encryption on data traffic between mesh nodes should be independent from encryption between mesh nodes and their client stations
Tyan-Shu Jou, et al., Janusys Networks

6. Other Issues Dynamic discovery Re-key Group Key
May 2004
Other Issues
Dynamic discovery
A node may moves in-and-out of range
Continuous discovery is needed to discover neighbors now in range
Re-authentication is necessary
Re-key
Pair-wise key between two mesh nodes should be replaced after a certain lifetime
Group Key
Generation and renew
Tyan-Shu Jou, et al., Janusys Networks