Nt1310 Unit 1 Ipv4 Networks

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IPsec is often installed on today's IPv4 networks to protect communication over VPN networks. It is used to access VPN, as well as between VPNs. IPv6 transition mechanisms can use this kind of infrastructure to achieve a certain level of protection, even in the absence of IPv6 IPsec. Remote IPv4 hosts access private networks by establishing encrypted VPN access to a gateway device set up for this purpose. If the same host is capable of IPv6, it can break through an IPv6 tunnel over this IPv4-protected communication channel.

Since IPv4 VPN puts the remote host on a private network, the natural choice for the IPv6 tunnel is the ISATAP (Intra-Site Automatic Tunnel Addressing Protocol), which is suitable for communication within a location. However, in practice, we can use any type of IPv6 tunnel as long as it is supported by the host and while the gateway is set up within the private network for it. Configurations for IPv4 access to VPN and IPv6 tunnel are completely independent. From the host's perspective, the tunnel configuration depends on the operating system used.
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IPv6 IPsec can be used for protection and control levels and data levels between two routers.
Cisco IOS software also offers a mechanism for protecting transmitted data between two routers using a new tunnel type that uses IPv6 IPsec. IKEv1 is used to manage the key. Figure 5.3 shows the topology in which this option is used between two routers A and

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