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Virtual Private Network (VPN) traffic leakages in dual-stack hosts/ networks

Document Type Replaced Internet-Draft (individual)
Expired & archived
Author Fernando Gont
Last updated 2013-01-14 (Latest revision 2012-10-15)
Replaced by draft-ietf-opsec-vpn-leakages
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-opsec-vpn-leakages
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The subtle way in which the IPv6 and IPv4 protocols co-exist in typical networks, together with the lack of proper IPv6 support in popular Virtual Private Network (VPN) products, may inadvertently result in VPN traffic leaks. That is, traffic meant to be transferred over a VPN connection may leak out of such connection and be transferred in the clear on the local network. This document discusses some scenarios in which such VPN leakages may occur, either as a side effect of enabling IPv6 on a local network, or as a result of a deliberate attack from a local attacker. Additionally, it discusses possible mitigations for the aforementioned issue.


Fernando Gont

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)