IPv6 Connectivity

Dual-stack (IPv4 and IPv6) support has been enabled on CTNET from the edge routers to the core switches since 2009. Native IPv6 network connections are provided to those departments which require them for testing and research activities. A central ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) server on the network enables departments without native IPv6 network connections to access external IPv6 servers if so desired.

As Windows 7/Vista are IPv6 enabled by default, the following steps can be used to enable the ISATAP router and interface:

  1. Run the Command Prompt as Administrator and execute the following commands:
  2. netsh interface ipv6 isatap set router isatap2.cityu.edu.hk
  3. netsh interface ipv6 isatap set state enabled

Use the command “ipconfig/all” to verify the ISATAP router and interface are enabled. Something similar to the following should be shown:

Tunnel adapter isatap.{BCD36552-8954-4CEC-9923-20098481B185}:

Connection-specific DNS Suffix  . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:ce0:5:10:200:5efe:144.214.32.4(Preferred)
Link-local IPv6 Address . . . . . : fe80::200:5efe:144.214.32.4%18(Preferred)
Default Gateway . . . . . . . . . : fe80::5efe:144.214.160.254%18
DNS Servers . . . . . . . . . . . : 144.214.5.20
144.214.5.27
NetBIOS over Tcpip. . . . . . . . : Disabled


To disable the ISATAP interface in the future, use
netsh interface ipv6 isatap set state disabled

csc@cityu.edu.hk