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A Solution For Source Address Validation in First Hop, Local Subnet Environment

A Solution For Source Address Validation in First Hop, Local Subnet Environment. Ren Gang Tsinghua University. Network Node to Support Source Address Validation. Current forwarding function & new source validation function

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A Solution For Source Address Validation in First Hop, Local Subnet Environment

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  1. A Solution For Source Address Validation in First Hop, Local Subnet Environment Ren Gang Tsinghua University

  2. Network Node to Support Source Address Validation • Current forwarding function & new source validation function • “Source Validation Info Generating Mechanism”: control plane component, implemented either in the control planes of existing forwarding elements or in an external servers. • “Source Validation Engine”: data plane component, typically need to be implemented on line cards.

  3. Address-Port Binding Based Solution For 802.1x Environment

  4. 2001:250:f001:f002:210:5cff:fec7:1204 Access accepted ＝ Access denied Spoof address2001:250:f001:f002:210:5cff:fec7:1203 ≠ Assigned address2001:250:f001:f002:210:5cff:fec7:1204 Match ? Match ? 00-02-3F-B6-DC-9A 2001:250:f001:f002:210:5cff:fec7:1204 2001:250:f001:f002:210:5cff:fec7:1204 2001:250:f001:f002:210:5cff:fec7:1204 2001:250:f001:f002:210:5cff:fec7:1204 2001:250:f001:f002:210:5cff:fec7:1204 { { + + + + } 00-02-3F-B6-DC-9A 00-02-3F-B6-DC-9A Port 2 Port 2 { { { + + + + + + } } } 00-02-3F-B6-DC-9A 00-02-3F-B6-DC-9A 00-02-3F-B6-DC-9A Port 2 Port 2 Port 2 } 2001:250:f001:f002:210:5cff:fec7:1204 Example IPv6 source address assigned Access request Binding in switch Access network

  5. Limitation and Future Work • Limitation • A simple model of a host connecting to a network via the same single interface and address. • Extension of existing protocols • Future Work • Problem to be solved according to the Charter: Nodes with multiple IP addresses on the same interface, Nodes that use multiple link-layer addresses on the same interface, etc. • A common framework for different solutions

  6. Thanks.

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