ICND1 Section 7 - IPv6 Flashcards
What does EUI stand for?
Extended Unique Identifier
What is the / range for IPv6 unique local address space?
FC00::/7
What do IPv6 link-local addresses start with?
FE80
What is the prefix range for link-local addresses?
FE80::/10 FE8 FE9 FEA FEB
What method is used to create the link-local address for an interface?
FE80::/64 + EUI-64 interface ID
What do IPv6 multicast addressess start with?
FF
What is the IPv6 multicast range?
FF00::/8
What IPv6 multicast range is reserved for link local only?
FF02::/16
What organization hands out IP’s globally?
IANA
When a host wants to use DHCPv6 to get an IP, what source/destination addresses does it use?
Source = it's link-local address Destination = FF02::1:2
What does SLAAC stand for?
StateLess Address AutoConfiguration
Command to set an IPv6 dhcp relay on an interface
conf t
int gi0/0
ipv6 dhcp relay destination -DHCP server addr-
Command to configure a router-id for an OSPFv3 router
conf t
ipv6 router ospf
router-id <ipv4></ipv4>
What is the all-EIGRP routers IPv6 address?
FF02::10
What are 2 uses for link-local addresses?
Communication with directly connected neighbors
Routers use their neighbors link-local addresses as next hops in routing tables
Syntax to enable OSPFv3 on a router
conf t
ipv6 router ospf <PID></PID>
3 steps for a host to get an IPv6 address using SLAAC
- Discover the v6 prefix on the link using NDP RS/RA messages.
- Create an interface ID and append it to the prefix.
- Test that it’s not a duplicate using DAD.
What address is an RS message sent to?
All-routers
FF02::2
Command to passive an OSPFv3 interface
conf t
ipv6 router ospf
passive-interface <interface></interface>
When using SLAAC, how does a host come up with it’s interface ID?
Either using EUI-64 or coming up with a random value.
What is the all-host IPv6 address?
FF02::1
What 5 IPv6 functions use NDP?
SLAAC DAD Router Discovery Neighbor MAC Discovery Prefix/length Discovery
What is the all-DHCP-agents multicast address?
FF02::1:2
What is the all-router IPv6 address?
FF02::2
What is the all-OSPF IPv6 address?
FF02::5
What is the all-DR IPv6 address?
FF02::6
Where would a host using SLAAC get the DNS server address?
From stateless DHCPv6
4 major types of IPv6 addresses
Global Unicast
Unique local
Multicast
Link-local
How does DAD work?
Host sends a NS message for it’s IPv6 address. If someone answers, must be a duplicate.
Who primarily sends an RS message?
Hosts