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<\/figure>\n\n\n\n<\/p>\n\n\n\n
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Understanding IPv6 Addresses: Link-Local, Regular, and Temporary<\/h1>\n\n\n\n
When you run the Format:<\/strong> Always begins with Scope:<\/strong> Only valid on the local link (LAN segment). It cannot be routed to the internet.<\/p>\n\n\n\n Purpose:<\/strong><\/p>\n\n\n\n Windows Zone Index ( You can see interface indexes with:<\/p>\n\n\n\n If you want to ping a link-local address, you must include the zone index, for example:<\/p>\n\n\n\n Format:<\/strong> Typically a global unicast address starting with Scope:<\/strong> Globally routable across the internet.<\/p>\n\n\n\n Purpose:<\/strong><\/p>\n\n\n\n This is the \u201cpermanent\u201d IPv6 address that stays consistent on a given network unless manually changed or reassigned.<\/p>\n\n\n\n Format:<\/strong> Looks like a regular global IPv6 address ( Why Temporary?<\/strong> To solve this, IPv6 introduced Privacy Extensions (RFC 4941)<\/strong>. With privacy extensions:<\/p>\n\n\n\n Here\u2019s what a typical Windows output looks like:<\/p>\n\n\n\n Every IPv6-enabled device typically carries three types of addresses at the same time:<\/p>\n\n\n\nipconfig<\/code> command in Windows, you might notice that your network adapter lists not one but three different IPv6 addresses<\/strong>. These are the link-local address<\/strong>, a regular IPv6 address<\/strong>, and a temporary IPv6 address<\/strong>. Let\u2019s break down what each one means, why they exist, and how they work together.<\/p>\n\n\n\n
\n\n\n\n1. Link-Local IPv6 Address<\/h2>\n\n\n\n
fe80::\/10<\/code> (so it starts with fe80<\/code>, fe81<\/code>, \u2026 up to febf<\/code>).<\/p>\n\n\n\n\n
%<\/code> number):<\/strong>
On Windows, a link-local address is often followed by something like %12<\/code>. This is called a zone index<\/strong> (or interface index). It tells the system which network adapter the address belongs to because multiple interfaces can all have link-local addresses that start with fe80::...<\/code>.<\/p>\n\n\n\nnetsh interface ipv6 show interface\n<\/code><\/pre>\n\n\n\nping fe80::1a2b:3c4d:5e6f%12\n<\/code><\/pre>\n\n\n\n
\n\n\n\n2. Regular (Stable) IPv6 Address<\/h2>\n\n\n\n
2000::\/3<\/code> (such as 2001:...<\/code>).<\/p>\n\n\n\n\n
\n\n\n\n3. Temporary IPv6 Address<\/h2>\n\n\n\n
2001:...<\/code>), but with a randomized interface ID<\/strong>.<\/p>\n\n\n\n
Normally, the stable IPv6 address can reveal information about your device, since part of it may be derived from the hardware MAC address. This makes it easy for websites or trackers to link all your activity to one consistent address.<\/p>\n\n\n\n\n
\n\n\n\nExample from
ipconfig<\/code><\/h2>\n\n\n\nEthernet adapter Ethernet:\n\n Link-local IPv6 Address . . . : fe80::1a2b:3c4d:5e6f%14\n Temporary IPv6 Address . . . : 2001:0db8:85a3:9d3::1234\n IPv6 Address . . . . . . . . : 2001:0db8:85a3:9d3::5678\n<\/code><\/pre>\n\n\n\n\n
fe80::...%14<\/code>)<\/strong> \u2192 Always present, only for LAN communication.<\/li>\n\n\n\n2001:...::1234<\/code>)<\/strong> \u2192 Randomized, used for privacy in outbound connections.<\/li>\n\n\n\n2001:...::5678<\/code>)<\/strong> \u2192 Stable, long-term identity on the IPv6 network.<\/li>\n<\/ul>\n\n\n\n
\n\n\n\nSummary<\/h2>\n\n\n\n
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fe80::\/10<\/code>) \u2192 Always there, LAN-only, required for IPv6 operations.<\/li>\n\n\n\n