ICMPv6

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ICMP is used as the internet protocol for control and troubleshooting. This video will look at how the ICMP protocol works in IPv6 and also a number of command line tools that utilize ICMP. These tools are invaluable to the administrator in troubleshooting and supporting their network. • Access the rest of the course: http://ITFreeTraining.com/ipv6 • Download the PDF handout: http://ITFreeTraining.com/handouts/ip... • ICMP • 00:14 Internet Control Message Protocol or ICMP provides error and control information that is used by the internet protocol. ICMP uses datagrams to send messages on the network. Datagrams are unreliable. This means, ICMP is not checked to see if it arrives at the destination. For example, just like sending a letter in the post, you cannot be sure if the message reaches the destination. ICMP is routable on the internet and used for such tasks as testing if a node is responsive on the network. If the node is not reachable, ICMP is used to find where the problem is. In IPv6 router advertisements are sent with ICMP. A lot of troubleshooting tools use ICMP. • IPConfig • 01:00 The IPConfig command does not use any ICMP message. It instead, reads the network configuration of the computer and displays it to the administrator. IPConfig is a great command for the administrator to quickly find out the network configuration of the computer. This command is normally run at the start of the troubleshooting process to find out the basic information about the computer like the IP Address and DNS servers. • Each network adapter in the computer will be displayed in a separate section. The following configuration may be displayed. • Connection specific DNS suffix: An administrator is able to configure a DNS suffix for each network adapter. This is configured in the advanced TCP/IP settings. If no connection specific DNS suffix is configured, the domain suffix will be used. • IPv6 Address: This is the IPv6 address being used by the network adapter. • Link-local IPv6 Address: This IP Address is assigned automatically to the adapter. It is used for communication on the local network. For example, neighbor discovery uses this address. At the end of the address is a % followed by a number. This is the zone index number. It is used to identify the adapter. • Default gateway: This is the IP Address that traffic will be sent to for remote networks. In this case example, the address used in the link local address of the router. Either a unicast or link local address can be used. This comes down to administrator preference. • By default, there is a network adapter called ISATAP. This will be listed as disconnected unless the administrator configures it and it is able to establish a connection. ISATAP is a transition protocol that allows IPv6 networks to communicate with each other when they are separated by an IPv4 network. • There will also be a section called Teredo. Teredo is a transition technology that allows IPv4 only computers to communicate on the IPv6 internet. It is enabled by default, but does require some configuration before it will start working. • • IPConfig /All | more • 04:10 To obtain more detailed network information about the computer and network adapters, the administrator can add the slash all switch. This will display a lot more information, so to prevent the information from scrolling up the screen “| More” can be added to the end. This will pause the output when the screen is full. • See http://itfreetraining.com/ipv6/icmpv6 for the rest of this video's description. This is only one video from the many free courses available on YouTube. • References • Ipconfig https://technet.microsoft.com/en-au/l... • Ping https://technet.microsoft.com/en-au/l... • Dynamic Host Configuration Protocol for IPv6 (DHCPv6) https://tools.ietf.org/html/rfc3315 • Tracert https://technet.microsoft.com/en-us/l... • PathPing https://technet.microsoft.com/en-us/l... • Netstat https://technet.microsoft.com/en-au/l... • MTU Path http://www.iea-software.com/products/... • Netsh overview https://technet.microsoft.com/en-us/l... • Credits • Trainer: Austin Mason http://ITFreeTraining.com • Voice Talent: HP Lewis http://hplewis.com • Companion Document: Phillip Guld https://philguld.com • Video Production: Kevin Luttman http://www.KevinLuttman.com

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