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- Unicast: One-to-one.
- Multicast: One-to-many.
- Anycast: One-to-closest.
- Link-local scope address: layer2 domain
- Unique / Site-local scope address: Organization
- Global scope address: Internet
- Transition technique designed to allow native IPv6 hosts to access IPv4-only content.
- (Translation technique not a tunneling technique).
- Primarily used to allow v6 hosts to initiate connections to IPv4 content.
- Mechanisms do exist to allow the reverse.
- Stateful and stateless versions.
- stateful can use any prefix
- stateless has restriction on prefix
NAT64 and DNS64 co-existance.
- IPv6 host sends AAAA DNS Query
- DNS64 server tries AAAA lookup and fails
- DNS64 server successfully resolves IPv4 address
- DNS64 server generates AAAA DNS response of <IPv6 prefix:IPv4 adress> and sends it back to the client.
- point-to-point tunnels
- MCT ( manually configured tunnel )
- GRE ( Generic Routing Encapsulation )
- Virtual point-to-point between two IPv4 routers
- IPv6 iGP routing protocols can run over these virtual links.
Similarities to IPv4
- Redistribution takes routes from the IP routing table, not from the iGP databases.
- Route maps can be used for filtering, metrics, route tags.
- Admnistrative distance has not changed.
- Options to prevent routing loops; Administrative distance, route tags, filtering.
- Syntax is the same.
Differences to IPv4
- Supported “match” commands in route-maps vary on iGP
- OSPF/RIP cannot match op “route-type” with a Route-map
- EIGRP has no problems using “route-type”
- Route-map matching IPv6 ACLs must have IPv6 prefix as source portion and “any” as destination of ACL.
- IPv6 redistribute connected does not include interfaces running the iGP;
- redistribute include-connected
- UPD port number 521
- No autosummarization for IPv6
- Destination address FF02::9
- Link-Local next-hops
- IPv6 uses IPv6 AH/ESP Authentication
- Enable it on the interface
- ipv6 rip CCNP enable fa0/0
- No network command
- EIGRP uses the neighbor’s link local address as the next-hop
- Destination FF02::AA
- Authentication relies on the IPv6 built-in authentication nad privacy
- IPv4 defaults to auto summarization, IPv6 doesn’t
- ipv6 unicast-routing
- ipv6 route eigrp 100
- (config-if)#ipv6 eigrp 100
- eigrp router-id RID