Category Archives: IPv6

Getting Started with IPv6

It took me a -long- time to wrap my head around IPv6. It wasn’t for lack of trying — a lot of the documentation is difficult. Here’s my quick IPv6 primer: Address Types There are a few types of addresses, you’ll have to memorize them. Link-Local – Starts with “fe80″ This is equivalent to the… Read More »

Static NAT-PT IPv6

Static NAT-PT IPv6 In this example, R3 and R4 are IPv6-only devices, and R2 is an IPv4-only device.  R1 is the NAT-PT router. R4 and R2 need to communicate, therefore two static translation entries are required in R1 to allow this bidirectional communication. R1(config)# interface s0/0/0 R1(config-if)# ipv6 nat %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to… Read More »

Translation Using NAT-PT

Translation Using NAT-PT NAT-PT is another powerful transition technique, but is not a replacement for dual stack or tunneling. Instead, it can be used in situations where direct communication between IPv6-only and IPv4-only networks is desired. It would not be appropriate in situations where connectivity between two IPv6 networks is required, because two points of… Read More »

Dynamic NAT-PT for IPv6

 Dynamic NAT-PT for IPv6 With dynamic NAT-PT, addresses are allocated from an address pool, the same as is done with IPv4 dynamic NAT. Again, the commands have similar syntax to their IPv4 NAT. When the NAT-PT router receives a packet with an IPv6 destination address of an arbitrarily assigned 96-bit prefix (the NAT-PT prefix), it… Read More »

Overview Of PIM Tunnels With Configuration

PIM tunnels are enabled automatically on routing platforms that have a tunnel PIC and on which you enable PIM sparse mode. You do not need to configure the tunnel interface. PIM tunnels are unidirectional. In PIM sparse mode, the first-hop routing platform encapsulates packets destined for the Rendezvous Point (RP) routing platform. The packets are… Read More »

Overview of Multicast Listener Discovery (MLD)

MLD is an IPv6 protocol that a host uses to request multicast data for a particular group. Using the information obtained through MLD, the software maintains a list of multicast group or channel memberships on a per-interfacebasis. Thedevicesthat receive MLD packetssendthe multicastdata that theyreceive for requested groups or channels out the network segment of the known receivers. MLDv1… Read More »

IPv6: Goodbye to broadcast, say hello to Multicast

In IPv6, there’s no longer any broadcast – sending one packet to a large number of unspecified hosts. There’s only multicast, unicast and anycast. In IPv6 all nodes are required to support multicast. Without multicast, many services that you need will simply not work. There’s a constant hum from the network on the multicast channels.… Read More »

Information About IPv6 Quality of Service With Example

IPv6 packets are forwarded by paths that are different from those for IPv4. QoS features supported for IPv6 environments include packet classification, queueing, traffic shaping, weighted random early detection (WRED), class-based packet marking, and policing of IPv6 packets. These features are available at both the process switching and Cisco Express Forwarding switching paths of IPv6.… Read More »