What's that % sign after ipconfig IPv6 address?

A link-local IPv6 address must be assigned to every network interface on which the IPv6 protocol is enabled. A host can automatically derive its own link local IP address or the address can be manually configured. Link-local addresses have a prefix of FE80::/10. They are mostly used for auto-address configuration and neighbour discovery. Why is there a percent sign '%' in the IPv6 address According to RFC 4291 section 2.8, every computer using IPv6 should assign a link-local address to every network interface. RFC 4291 section 2.5.6 shows the bits that link-local addresses must start with, which cause the link-local addresses to start with "fe80:0000:0000:0000:" (although many of those zeros get collapsed to a double colon). Cisco IOS IPv6 Command Reference - IPv6 Commands: ipv6 a

IPv6 Link-local and Site-local Addresses - Win32 apps

ip - What is Link-local addressing? - Network Engineering Every IPv6 interface is going to get a Link-Local address so that a device can at least communicate on the local link, and, as a built-in feature, many things, e.g. … IPv6 - Address Types & Formats - Tutorialspoint

A link-local IPv6 address must be assigned to every network interface on which the IPv6 protocol is enabled. A host can automatically derive its own link local IP address or the address can be manually configured. Link-local addresses have a prefix of FE80::/10. They are mostly used for auto-address configuration and neighbour discovery.

If your IPv6 strategy is to delay implementation as long as you can, you still must address IPv6 security concerns right now.. If you plan to deploy IPv6 in a dual-stack configuration with IPv4