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Cisco CCNA 1.9 Cisco CCST Networking 2.3 CompTIA Network+ 3.4 Cisco CCNA 1.8
TechKnowSurge Catalog Interactives IPv6 Multicast Group Calculator
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IPv6 Multicast Group Calculator

Build IPv6 multicast addresses from scope and group ID, pick the scope for a reach, and work out multicast MACs and solicited-node groups.

⚑ Complete this interactive to capture a CTF flag worth 5 points.

About this interactive

An IPv6 multicast address is built from parts you can read. It always starts ff. The next hex digit is the flags, 0 for a well-known group, and the one after that is the scope, which sets how far the group may travel, from the sending interface alone up to the whole internet. The rest is the group ID. So all routers on one link is ff02::2, and the lesson's table gives the digit for each wider scope. Switches forward by MAC address, so each group has an Ethernet MAC too: 33:33 followed by the last 32 bits of the group address. ff02::c, the SSDP group, goes to 33:33:00:00:00:0c. Every unicast address a host holds also gets a solicited-node group, built from the end of the address. Neighbor discovery sends its questions there instead of broadcasting, so only hosts whose addresses end the same way take them in. Seven of the twenty questions are drawn each run, and any you miss shows the answer and how to work it out.

What you'll learn

Aligned to

Cisco CCNA
1.9 Describe IPv6 address types
1.8 Configure and verify IPv6 addressing and prefix
Cisco CCST Networking
2.3 Identify IPv6 addresses and prefix formats
CompTIA Network+
3.4 Given a scenario, implement IPv4 and IPv6 network services

Key terms

IPv6 Multicast Address
An IPv6 address in the FF00::/8 range used to deliver packets to multiple subscribed interfaces simultaneously.
Multicast Scope
A 4-bit field in an IPv6 multicast address that defines the boundary within which the multicast traffic is confined, such as interface-local, link-local, site-local, or global.
Solicited-Node Multicast Address
A special IPv6 multicast address in the FF02::1:FF00:0/104 range that is derived from the last 24 bits of a device's IPv6 address, used by Neighbor Discovery to efficiently perform address resolution without broadcasting to all hosts. Instead of flooding all devices the way ARP does in IPv4, NDP sends solicitations only to the small group of devices sharing those same 24 bits.
MAC Address
A 48-bit hardware address assigned to a network interface and written as six hexadecimal octets, such as 00:1A:2B:3C:4D:5E. It identifies a device uniquely on a local network segment, and switches forward frames by looking it up in their MAC address table.

Topics

Ipv6 Multicast Multicast Scope Solicited Node Interactive Calculation

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