I have a testing router Cisco model 7200/7204 model and my dhcpv6 configuration are as below. ipv6 dhcp pool dhcpv6  prefix-delegation pool ipv6_pool1 lifetime 7200 300  address prefix 2001:470:19:417::/64  dns-server 2001:4860:4860::8888  dns-server 2001:4860:4860::8844 interface GigabitEthernet0/2.20  ipv6 address 2001:470:19:417::1/64  ipv6 enable  ipv6 dhcp server dhcpv6     ipv6 local pool ipv6_pool1 2001:470:F8EE::/48 64 ipv6 local pool ipv6_ppp 2001:470:19:400::/58 64   I want to change my DHCP pool from /64 to /48. When I am trying to change the configurations it is showing error as (config-subif)#ipv6 address 2001:470:19:417::1/48 %GigabitEthernet0/2.20: Error: 2001:470:19::/48 is overlapping with 2001:470:19:400::/64 on Virtual-Access4   Help me to configure the DHCPv6 pool and prefix configurations. Thanks, Arutkavi ... View more

I have a ipv6 pool configuraion in my 7204 vxr,  Here is my pool configuration  ipv6 unicast-routing ipv6 source-route ipv6 cef ipv6 dhcp pool STATEFUL address prefix 2001:1111:1111:1234::/64 dns-server 2001:4860:4860::8888 domain-name PRODAPT.LOCAL ! ipv6 dhcp pool dhcpv6 prefix-delegation pool ipv6_pool1 lifetime 7200 300 address prefix 2001:470:19:417::/64 dns-server 2001:4860:4860::8888 dns-server 2001:4860:4860::8844 Here is my interface configuration interface GigabitEthernet0/2 description VLAN 20 PPPPoE/DHCP encapsulation dot1Q 20 ip dhcp relay information trusted ip address 10.102.2.1 255.255.255.0 secondary ip address 10.102.1.1 255.255.255.0 no ip redirects no ip proxy-arp ip accounting output-packets ip accounting access-violations ip nat inside no ip virtual-reassembly no ip mroute-cache ipv6 address 2001:470:19:417::1/64 ipv6 enable ipv6 dhcp server dhcpv6 pppoe enable group global no cdp enable arp timeout 86400 Here is my client interface IP address from command "ifconfig"   eth0 Link encap:Ethernet HWaddr f8:bc:12:a1:16:ae inet addr:10.102.1.4 Bcast:10.102.1.255 Mask:255.255.255.0 inet6 addr: 2001:470:19:417:14c0:7733:7b3e:f8a9/64 Scope:Global inet6 addr: 2001:470:19:417:fabc:12ff:fea1:16ae/64 Scope:Global inet6 addr: fe80::fabc:12ff:fea1:16ae/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2291896 errors:0 dropped:87 overruns:0 frame:0 TX packets:385856 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:222012633 (222.0 MB) TX bytes:29996875 (29.9 MB) Here is my Tunnel Configuartion in Router,  interface Tunnel0 description Hurricane Electric IPv6 Tunnel Broker no ip address ipv6 address 2001:470:18:417::2/64 ipv6 enable tunnel source x.x.x.x //IPv4 source public IP tunnel destination x.x.x.x //IPv4 destination public IP tunnel mode ipv6ip  I have disabled the IPv4 from network interface and using only IPv6 address. I tried to access ipv6.google.com in my browser and it is not loading. Any websites even it is ipv4 it is not loading. I could not find what is the problem in my router. but if I enabled the IPv4 in my LAN client it forwarding all IPv6 traffic via ipv4. (4to6 tunnel).   1. I tried with IPv6 alone but it is not forwarding my internet request. What else I am missing? 2. My BRAS has a 6 to 4 tunnel, is the configuration correct?. If yes, is it possible that i can reach internet via IPv6 only in my topology? If no, then kindly help me. ... View more