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I was looking at my computer ip configuration in Windows (ipconfig) from command prompt. and I noticed that I have like 5 different ipv6 addresses. I guess one must be assigned by dhcp, but I also have ipv6 that says "temporary" next to it. and finally, a local-link ip address v6. which ipv6 address is the one my computer uses to stablish communication with other computers? and why I have so many of them? this is output from ipconfig /all
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . : hsd1.fl.comcast.net
Description . . . . . . . . . . . : Intel(R) Dual Band Wireless-AC 3168
Physical Address. . . . . . . . . : B4-D5-BD-A9-94-DF
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:58a:887e:4a0::aa91(Preferred)
Lease Obtained. . . . . . . . . . : Sunday, December 11, 2022 9:48:07 PM
Lease Expires . . . . . . . . . . : Tuesday, December 13, 2022 5:23:59 AM
IPv6 Address. . . . . . . . . . . : 2601:58a:887e:4a0:5850:d0a6:5d52:74d3(Preferred)
Temporary IPv6 Address. . . . . . : 2601:58a:887e:4a0:d935:1afc:e20f:f510(Preferred)
Link-local IPv6 Address . . . . . : fe80::562a:e40b:54ae:32b3%14(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.90(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, December 11, 2022 9:48:05 PM
Lease Expires . . . . . . . . . . : Wednesday, December 14, 2022 8:18:17 AM
Default Gateway . . . . . . . . . : fe80::9a52:4aff:fe9a:81ce%14
10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 162846141
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-62-B9-10-80-CE-62-D5-B2-78
DNS Servers . . . . . . . . . . . : 2001:558:feed::1
2001:558:feed::2
8.8.8.8
NetBIOS over Tcpip. . . . . . . . : Enabled
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Each IPv6 address is used for different purpose like DNS address, router/gateway address, your computer address and so on. The most common one you will encounter and probably confuse you is the "Temporary IPv6" or RFC 4941 address which are random IPv6 addresses assigned to your pc by Windows in order to protect your privacy. IPv6 real public addresses can identify stuff like your MAC address, location and ISP used so be thankful you have so many IPv6 addresses.