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Henry V Child 2025-04-06 19:18:01 +02:00
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content/posts/2025/About IPv6 Multicast Addresses/index.md
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In IPv6 multicast is used much more frequently that in legacy IPv4 which is cool because multicast can do some very interesting things such as mDNS and next hop redundancy among others. But how are multicast addresses formed and what do the individual parts of a mulitcast address mean? In this note the elements of a IPv6 Multicast address are explained and different values made clear. In IPv6 multicast is used much more frequently that in legacy IPv4 which is cool because multicast can do some very interesting things such as mDNS and next hop redundancy among others. But how are multicast addresses formed and what do the individual parts of a mulitcast address mean? In this note the elements of a IPv6 Multicast address are explained and different values made clear.
![[IPv6 Multicast Addr.svg]] ![An IPv6 Address dissected](images/IPv6 Multicast Addr.svg)
## Prefix ## Prefix
all IPv6 multicast addresses use the address space `ff::/8`. This means that the first 8 bits of an IPv6 multicast address are always set to 1 or rather are prefixed with `ff`. all IPv6 multicast addresses use the address space `ff::/8`. This means that the first 8 bits of an IPv6 multicast address are always set to 1 or rather are prefixed with `ff`.