Router - Cisco IPv6 Native Config: Difference between revisions
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conf t |
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ipv6 source-route |
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ipv6 unicast-routing |
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ipv6 cef |
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ipv6 multicast-routing |
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ipv6 route ::/0 Dialer0 |
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conf t |
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interface FastEthernet 0/0 |
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ipv6 address <your_slash_48>:1::/64 eui-64 |
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ipv6 enable |
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ipv6 nd prefix <your_slash_48>:1::/64 |
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ipv6 nd managed-config-flag |
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ipv6 nd router-preference High |
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ipv6 nd ra interval 60 |
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</pre> |
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EDIT - Feb 2015 - Above didn't work for me, alternative config below |
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<pre> |
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! Feb 2015 - Cisco 1841 / FTTC |
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! LAN Port (I used default /64 on clueless) |
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! |
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interface FastEthernet0/0 |
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ipv6 address 2001:8B0:xx:xxxx::1/64 |
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ipv6 enable |
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ipv6 nd other-config-flag |
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ipv6 dhcp server ipv6dhcp_pool |
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! |
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! Below gives out IPv6 DNS to clients |
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! |
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ipv6 dhcp pool ipv6dhcp_pool |
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dns-server 2001:8B0::2020 |
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dns-server 2001:8B0::2021 |
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conf t |
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interface dialer0 |
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ipv6 enable |
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ipv6 traffic-filter adsl-ipv6 in |
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</pre> |
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02/11/2011 |
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The above config didn't work for me I had to create a new /64 via Clueless and add this here as an IP address |
The above config didn't work for me I had to create a new /64 via Clueless and add this here as an IP address |
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<pre> |
<pre> |
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ipv6 nd prefix <your_slash_64>::1/64 |
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I would also add the following traffic-filter to the dialer interface |
I would also add the following traffic-filter to the dialer interface |
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ipv6 traffic-filter outboundfilters-ipv6 out |
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</pre> |
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EDIT Feb 2015 - Alternative config below |
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<pre> |
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! Feb 2015 - Cisco 1841 / FTTC |
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! WAN |
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! |
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interface Dialer0 |
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ipv6 address dhcp rapid-commit |
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ipv6 enable |
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conf t |
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ipv6 access-list ipv6 adsl-ipv6 |
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permit tcp any any established |
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permit icmp any any |
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deny ipv6 any any |
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interface dialer0 |
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ipv6 traffic-filter adsl-ipv6 in |
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ipv6 traffic-filter outboundfilters-ipv6 out |
ipv6 traffic-filter outboundfilters-ipv6 out |
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If you include the "deny any any" line a "show access-lists ..." will show the number of |
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packets that have hit that line. Thus you can tell if a problem exists because |
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the packets are not passing through the access list or failure to communicate is |
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because of some other problem. |
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[[Category:3rd Party Routers|Cisco]] [[Category:IPv6]] |
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Latest revision as of 10:05, 27 February 2015
This page will walk you through getting IPv6 to work correctly on your Cisco device
Enable IPv6 routing on your router
conf t ipv6 source-route ipv6 unicast-routing ipv6 cef ipv6 multicast-routing ipv6 route ::/0 Dialer0
Enable IPv6 to work on your internal Ethernet Ports
conf t interface FastEthernet 0/0 ipv6 address <your_slash_48>:1::/64 eui-64 ipv6 enable ipv6 nd prefix <your_slash_48>:1::/64 ipv6 nd managed-config-flag ipv6 nd router-preference High ipv6 nd ra interval 60
EDIT - Feb 2015 - Above didn't work for me, alternative config below
! Feb 2015 - Cisco 1841 / FTTC ! LAN Port (I used default /64 on clueless) ! interface FastEthernet0/0 ipv6 address 2001:8B0:xx:xxxx::1/64 ipv6 enable ipv6 nd other-config-flag ipv6 dhcp server ipv6dhcp_pool ! ! Below gives out IPv6 DNS to clients ! ipv6 dhcp pool ipv6dhcp_pool dns-server 2001:8B0::2020 dns-server 2001:8B0::2021
Enable IPv6 to work on your WAN side
conf t interface dialer0 ipv6 enable ipv6 traffic-filter adsl-ipv6 in
02/11/2011 The above config didn't work for me I had to create a new /64 via Clueless and add this here as an IP address
ipv6 nd prefix <your_slash_64>::1/64
I would also add the following traffic-filter to the dialer interface
ipv6 traffic-filter outboundfilters-ipv6 out
EDIT Feb 2015 - Alternative config below
! Feb 2015 - Cisco 1841 / FTTC ! WAN ! interface Dialer0 ipv6 address dhcp rapid-commit ipv6 enable
Lock down your IPv6 network with an access list
conf t ipv6 access-list ipv6 adsl-ipv6 permit tcp any any established permit icmp any any deny ipv6 any any interface dialer0 ipv6 traffic-filter adsl-ipv6 in
02/11/2011
I would use the following access-list - I would advise against allowing any IPv6 ICMP into the network unless absolutely necessary and then only allow on a case-by-case basis
ipv6 access-list adsl-ipv6 ! This only allows in IPv6 traffic which originated from our local network ! No need for a deny at the end as an implicit deny is the default evaluate tcptraffic-out-ipv6 evaluate udptraffic-out-ipv6 evaluate icmptraffic-out-ipv6 ipv6 access-list outboundfilters-ipv6 ! This only creates a reflexive access-list that adsl-ipv6 uses to allow traffic back in ! No need for a deny at the end as an implicit deny is the default permit tcp any any reflect tcptraffic-out-ipv6 timeout 30 permit icmp any any reflect icmptraffic-out-ipv6 timeout 30 permit udp any any reflect udptraffic-out-ipv6 timeout 30 interface dialer<n> ipv6 traffic-filter adsl-ipv6 in ipv6 traffic-filter outboundfilters-ipv6 out
If you include the "deny any any" line a "show access-lists ..." will show the number of packets that have hit that line. Thus you can tell if a problem exists because the packets are not passing through the access list or failure to communicate is because of some other problem.