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Ipv6 nat v6v4 pool v6v4-pool 202.101.100.10 202.101.100.20 prefix-length 24 9 Image 6to4.ipv6.microsoft.com and so on. Then call the track object in the route-map Aggregate global unicast address ( IANA to registers ) Image Router bgp 300 Ip address 10.1.12.1 255.255.255.0 Fast switching type 1, interface type 18 IP CEF switching enabled *Mar 1 00:11:48.023: ICMP: echo reply rcvd, src 2.2.2.2, dst 192.168.123.3 The mask of the destination address. Phenomenon analysis: These multicast packets generated by R2 , the source address is the address of Fa1/0 port of R2 , and the destination does not say that the IP address of the multicast group is determined . These multicast data arrive at R3 , since R3 is the first hop router, and the Fa0/0 port of R3 is the DR of the local LAN , so IPv6 provides perfect support for Ipsec , so the upper layer protocol can save many security options, such as OSPFv3 cancels the authentication. A quick look at: R1 and R3 respectively apply for the public network Ipv4 address and configure a dynamic 6to4 tunnel. In R1 , for example, arranged Tunnel 0 , assign an IPv6 address ( 6to4 address), this address is R1 is V4 external network address corresponding to the IPv6 6to4 address, i.e. 202.101.12.1 corresponding to Then the inner IPv6 header, the source is the Linklocal address of the ISATAP host , and the purpose is the Linklocal address of the ISATAP router. Net 49.0001.0000.0000.0001.00 Authentication (16 octets) ! !! ipv4 routing, so that the route can access the tunnel destination , which is 10.1.23.3 ISATAP router establishes a tunnel and get IPv6 addresses, but also to be able to ping through 20001: 8888 :: 8 Command Image Image 7 Such as: 2001 : 00 a8 : 0 207 : 0000 : 0000 : 0000 : 0000 : 8207 Image Set ip next-hop verify-availability 10.1.1.2 10 track 1 Ipv6 unicast-routing interface fastEthernet 0/0 Route-map test permit 10 Image REACH Before we talk about are two IPv6 islands of use is 6to4 of IPv6 address space. The 6to4 border router is sent to receive Ipv6 router rip RIPprocess exit Unassigned Border Gateway Protocol (BGP) Connected Whether it is a GRE tunnel or an IPv6 over IP tunnel, dynamic routing protocols can be run at both ends of the tunnel. For example, in the above, you can configure the ipv6 address for both interfaces of the tunnel , and then activate the dynamic routing protocol. In terms of encapsulation efficiency, IPv6 over IP is better than GRE . After all, there is one layer of GRE encapsulation, but when running dynamic routing protocols, in some cases, the versatility or compatibility of GRE encapsulation is better than IPv6. Over IP encapsulation is better, such as running the ISIS protocol,free download ccna dumps latest, and using IPv6 over IP tunnels will be a bit problematic.