TCP/IPv6 Configuration and Management Manual (G06.24+)

Plan Your IPv6 Implementation
HP NonStop TCP/IPv6 Configuration and Management Manual—524523-008
4-7
Intranet-to-Internet-to-Intranet Scenario
using IPv6. For IPv6 traffic between the v4/v6 routers on each subnet, you configure
router-to-router tunnels.
Figure 4-3 shows a scenario in which the corporation described in the previous
sections wants to connect its corporate network with one of its geographically remote
departments to create a VPN.
To communicate with Host K, Host A sends the IPv6 packet to Router A. Router A
encapsulates the IPv6 packet and sends the IPv4 packet over a router-to-router tunnel
to Router E, which decapsulates the IPv4 packet and routes the IPv6 packet to Host K.
For routers, the router-to-router tunnel is more efficient because it saves the Router A
administrator from having to create individual router-to-host tunnels for each
destination host.
Figure 4-3. Deploying IPv6 in an Intranet-to-Internet to Intranet Scenario
VST140.vsd
Department B
Router B
v4/v6
Host D Host E
Host F
v4
v4
v4/v6
Router C v4
Department A
v4/v6 v4/v6 v4/v6
Router A v4/v6
Host A Host B
Host C
Department C
Host G Host H
Host I
v4
v4
v4/v6
Router D v4
Department C
Host J Host K
Host L
v4
v4/v6
v4
Router E v4/v6
Internet