IPv6 Routing Configuration
25-8 Configuring and Managing IPv6
the MTU value for the tunnel interfaces was reduced by 20 octets, to allow for the basic IPv4
headers added to IPv6 packets.
Figure 25-1 Basic IPv6 Over IPv4 Tunnel
Router R1
R1(su)->router
R1(su)->router>enable
R1su)->router#configure
Enter configuration commands:
R1(su)->router(Config)#interface vlan 10
R1(su)->router(Config-if(Vlan 10))#ip address 192.168.10.1 255.255.255.0
R1(su)->router(Config-if(Vlan 10))#no shutdown
R1(su)->router(Config-if(Vlan 10))#exit
R1(su)->router(Config)#interface tunnel 10
R1(su)->router(Config-if(Tnnl 101))#ipv6 address 2001:db8:111:1::10/127
R1(su)->router(Config-if(Tnnl 101))#tunnel source 192.168.10.1
R1(su)->router(Config-if(Tnnl 101))#tunnel destination 195.167.20.1
R1(su)->router(Config-if(Tnnl 101))#tunnel mode ipv6ip
R1(su)->router(Config-if(Tnnl 101))#exit
R1(su)->router(Config)#show ipv6 interface tunnel 10
Tunnel 10 Administrative Mode Enabled
Tunnel 10 IPv6 Routing Operational Mode Enabled
Mode for IPv6 Tunnel IPv6OVER4
Source Address for IPv6 Tunnel 192.168.10.1
Destination Address for IPv6 Tunnel 195.167.20.1
IPv6 is Enabled
IPv6 Prefix is FE80::A0C:102/128
2001:db8:111:1::10/127
Routing Mode Enabled
Interface Maximum Transmit Unit 1480
Router Duplicate Address Detection Transmits 1
Router Advertisement NS Interval 0
Router Advertisement Lifetime 1800
Router Advertisement Reachable Time 0
Router Advertisement Min Interval 200
Router Advertisement Max Interval 600
Router Advertisement Managed Config Flag Disabled
Router Advertisement Other Config Flag Disabled
Router Advertisement Suppress Flag Disabled
Router R1 Router R2
VLAN 10 – 192.168.10.1
Tunnel 10
IPv6 Addr: 2001:DB8:111:1::10/127
Tunnel Source: 192.168.10.1
Tunnel Destination: 195.167.20.1
VLAN 20 – 195.167.20.1
Tunnel 10
IPv6 Addr: 2001:DB8:111:1::20/127
Tunnel Source: 195.167.20.1
Tunnel Destination: 192.168.10.1
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