Showing posts with label IPv6. Show all posts
Showing posts with label IPv6. Show all posts

CCNP Notes : IPV6 Quick Notes

by Shabeeribm
IPV6 Quick Notes 
Make sure you all the below details before appearing for CCNP routing exam

Points to Remember 
  • IPv6 unicast-routing command must be globally enabled on a Cisco router to support IPv6 
  • In IPv6,host can auto configure its address without the aid of a DHCP server 
  • OSPFv3 for IPv6 authentication is supported by IPv6 IPsec. 
  • Type 9 LSA means Intra-area prefix LSA 
  • An automatic 6to4 tunnel allows multiple IPv4 destinations compared 
  • to manually configured  IPv6 in IPv4 tunnel 
  • 6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix.  
To configure 6to4 tunneling on a dual-stack edge router 
  • Tunnel mode(6t04) 
  • IPv4 Tunnel Source 
  • 6to4 IPv6 address (within 2002::/16)  
Two rules for compacting IPv6 addresses 
  • The leading zeroes in any 16-bit segment do not have to be written. 
  • Any single, continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon. 
Differences between an IPv4 header and an IPv6 header 
  • An IPv4 header includes a checksum. However, an IPv6 header does not include one.  
  • An IPv6 header is simpler and more efficient than an IPv4 header. 
  • An IPv6 header has twice as many octets as an IPv4 header.  
Two statements are true about using IPv4 and IPv6 simultaneously on a network segment
  • Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP. 
  • IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts. 
What is IPv6 router solicitation? 
A request made by a node for the IP address of the local router

What does the command clear ipv6 ospf process accomplish? 
The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.

Related articles

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IPv6 transition technologies

by Shabeeribm

6 to 4 tunneling: This mechanism allows IPv6 sites to communicate with each other over the IPv4 network without explicit tunnel setup. The main advantage of this technology is that it requires no end-node reconfiguration and minimal router configuration but it is not intended as a permanent solution.

 

ISATAP tunneling (Intra-Site Automatic Tunnel Addressing Protocol): is a mechanism for transmitting IPv6 packets over IPv4 network. The word “automatic” means that once an ISATAP server/router has been set up, only the clients must be configured to connect to it.

 

Teredo tunneling: This mechanism tunnels IPv6 datagrams within IPv4 UDP datagrams, allowing private IPv4 address and IPv4 NAT traversal to be used.

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IPv6 Multicast addresses

by Shabeeribm

Below lists some reserved and well-known IPv6 multicast address in the reserved multicast address range (FF00:: to FF0F::)

 

Multicast Address

Multicast Group

FF01::1

All IPv6 nodes within the node-local scope

FF01::2

All IPv6 routers within the node-local scope

FF02::1

All IPv6 nodes within the link-local scope

FF02::2

All IPv6 routers within the link-local scope

FF02::5

All OSPFv3 routers within the link-local scope

FF02::6

All OSPFv3 designated routers within the link-local scope

FF02::9

All RIPng routers within the link-local scope

FF02::A

All EIGRP routers within the link-local scope

FF02::D

All PIM routers within the link-local scope

FF02::1:2

All DHCPv6 agents (servers and relays) within the link-local scope

FF05::2

All IPv6 routers within the site-local scope

FF02::1:FF00:0/104

IPv6 solicited-node multicast address within the link-local scope

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Short Notes on IPv6

by Shabeeribm

IPV6 Quick Notes 
Make sure you all the below details before appearing for CCNP routing exam

Points to Remember 
  • IPv6 unicast-routing command must be globally enabled on a Cisco router to support IPv6 
  • In IPv6,host can auto configure its address without the aid of a DHCP server 
  • OSPFv3 for IPv6 authentication is supported by IPv6 IPsec. 
  • Type 9 LSA means Intra-area prefix LSA 
  • An automatic 6to4 tunnel allows multiple IPv4 destinations compared 
  • to manually configured  IPv6 in IPv4 tunnel 
  • 6to4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32-bit IPv4 address of the edge router, creating a 48-bit prefix.  
To configure 6to4 tunneling on a dual-stack edge router 
  • Tunnel mode(6t04) 
  • IPv4 Tunnel Source 
  • 6to4 IPv6 address (within 2002::/16)  
Two rules for compacting IPv6 addresses 
  • The leading zeroes in any 16-bit segment do not have to be written. 
  • Any single, continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon. 
Differences between an IPv4 header and an IPv6 header 
  • An IPv4 header includes a checksum. However, an IPv6 header does not include one.  
  • An IPv6 header is simpler and more efficient than an IPv4 header. 
  • An IPv6 header has twice as many octets as an IPv4 header.  
Two statements are true about using IPv4 and IPv6 simultaneously on a network segment
  • Hosts can be configured to receive both IPv4 and IPv6 addresses via DHCP. 
  • IPv6 allows a host to create its own IPv6 address that will allow it to communicate to other devices on a network configured via DHCP. IPv4 does not provide a similar capability for hosts. 
What is IPv6 router solicitation? 
A request made by a node for the IP address of the local router

What does the command clear ipv6 ospf process accomplish? 
The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.

Related articles

Read More...