ISATAP is short for Intra-Site Automatic Tunnel Addressing Protocol. It's
described in RFC 5214(March 2008).
ISATAP allow dual-stack nodes use ISATAP to automatically tunnel IPv6
packets in IPv4.
Windows provide ISATAP support since Windows XP. Configuration can be set in
[netsh interface ipv6 isatap].
The problem is: when Disable IPv6 support option in LAN NIC under
Windows XP/2003, data flow speed in ISATAP tunnel down to 100KBytes/second.
Speed returns to normal when IPv6 support option enabled in LAN NIC.
As there is no IPv6 native router in LAN, IPv6 packets are all tunnel in
ipv4. Data flow should not be affect by LAN Native IPv6 support Option.
there is no different in [netsh int ipv6 show route] when Enable or Disable
IPv6 LAN Option.
Windows 2003 x64 sp2 5.2.3790
Windows XP x86 sp2 5.1.2600
In all situation above, client pc NIC connect to LAN without native IPv6
access router. That's to say, all IPv6 data flow must be tunneled.
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