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One unintended consequence of leaving IPv6 enabled on either Server 2008/2008 R2 or Win 7 is that the link local addresses can still be working on the local subnet even in the case that IPv4 is broken due to VLAN tagging…or any number of other reasons…why is that? The Link Local Addresses discover each other via layer 2 broadcasts. (Before anyone shouts at me…I know that they use Layer 3 multicast…but the addresses map to layer two broadcasts.)

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