firewalls and NAT's.
Heartbeat – sends a packet to the PoP (Point of Presence,
serving IPv6 in IPv4 tunnel), then enables the tunnel on the
PoP side.
Each account applied by the user from AICCU service
Tunnel ID
provider supports 2 or more services for IPv4 to IPv6/IPv6
to IPv4 with different tunnel IDs. Simply type tunnel ID
characters obtained from AICCU service provider for IPv6
connection. For the default setting, simply use the word
"any".
For more details, please refer to
http://www.sixxs.net/tools/aiccu/。
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Vigor1000 Series User's Guide