CODEWITHSUNDEEP
delphiipv6
Padam
Padam

Reputation: 117

Understanding the difference between local and global IPv6 address

I'm implementing REST client in my Delphi application. The devices, I will be connecting to can be on local or global IPv6 addresses. The devices are having REST server and my application prepares REST URI by using %interface_index at the end of IPv6 address. I'm observing connection problems when I use interface index(Zone_id) in the ipv6 address when its global. I'm wondering if there is a way where i can differentiate between these and decide when to use the index or not.

Upvotes: 1

Views: 2090

Answers (1)

Ron Maupin
Ron Maupin

Reputation: 6452

IANA maintains some documents that may help. For example, Internet Protocol Version 6 Address Space

Every IPv6 interface will have a Link-Local address. Packets addressed with Link-Local addresses cannot be routed off the link (hence, Link-Local). Every link will use the same network, so you need to distinguish Link-Local addresses by adding a Zone ID. All Link-Local addresses are in the fe80::/10 network.

Global addresses are in the 2000::/3 range, but there are some address blocks within that range that are not forwardable or globally reachable. See the IANA IPv6 Special-Purpose Address Registry.

You should also study RFC 4291, IP Version 6 Addressing Architecture.

Upvotes: 1

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