Which two tunneling techniques in IPv6 do not require an IPv4 tunnel destination in the
configuration? (Choose two.)
A.
6to4
B.
6over4
C.
ISATAP
D.
GRE
Explanation:
Example: Configuring 6to4 Tunnels
The following example configures a 6to4 tunnel on a border router in an isolated IPv6 network.
The IPv4 address is 192.168.99.1, which translates to the IPv6 prefix of 2002:c0a8:6301::/48. The
IPv6 prefix is subnetted into 2002:c0a8:6301::/64 for the tunnel interface: 2002:c0a8:6301:1::/64
for the first IPv6 network, and 2002:c0a8:6301:2::/64 for the second IPv6 network. The static route
ensures that any other traffic for the IPv6 prefix 2002::/16 is directed to tunnel interface 0 for
automatic tunneling.
interface Ethernet0
description IPv4 uplink
ip address 192.168.99.1 255.255.255.0
!
interface Ethernet1description IPv6 local network 1
ipv6 address 2002:c0a8:6301:1::1/64
!
interface Ethernet2
description IPv6 local network 2
ipv6 address 2002:c0a8:6301:2::1/64
!
interface Tunnel0
description IPv6 uplink
no ip address
ipv6 address 2002:c0a8:6301::1/64
tunnel source Ethernet 0
tunnel mode ipv6ip 6to4
!
ipv6 route 2002::/16 tunnel 0
Example: Configuring ISATAP Tunnels
The following example shows the tunnel source defined on Ethernet 0 and the tunnel mode
command used to configure the ISATAP tunnel. Router advertisements are enabled to allow client
autoconfiguration.
ipv6 unicast-routing
interface tunnel 1
tunnel source ethernet 0
tunnel mode ipv6ip isatap
ipv6 address 2001:DB8::/64 eui-64
no ipv6 nd ra suppress
exit