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My local network is simple.

sudo ifconfig
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.31.52  netmask 255.255.255.0  broadcast 192.168.31.255
        inet6 fe80::e23f:49ff:fe57:4bd1  prefixlen 64  scopeid 0x20<link>
        ether    txqueuelen 1000  (Ethernet)
        RX packets 934205  bytes 918638128 (876.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 557104  bytes 69517532 (66.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 2773  bytes 4761793 (4.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2773  bytes 4761793 (4.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I want to my vps which own ip6 address.
enter image description here

ssh -vv -6  2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0
OpenSSH_7.4p1 Debian-10+deb9u7, OpenSSL 1.0.2u  20 Dec 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0" port 22
ssh: Could not resolve hostname 2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0: Name or service not known

sudo ip -6 addr add 2001:19f0:5401:1cda:5400:02ff:fe8c:056f/128 dev enp3s0
ssh -vv -6  2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0
OpenSSH_7.4p1 Debian-10+deb9u7, OpenSSL 1.0.2u  20 Dec 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0" port 22
ssh: Could not resolve hostname 2001:19f0:5401:1cda:5400:02ff:fe8c:056f%enp3s0: Name or service not known
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  • you don't seems to have public IPV6 address, address starting with fe80: are local, if testing withing same network, try sshing to fe80::e23f:49ff:fe57:4bd1 Commented Feb 12, 2020 at 14:49
  • 1
    Just a hint: censoring the IP out of the command is not of much help if it's still visible in the resulting debug output. Commented Feb 12, 2020 at 15:07
  • 1
    Delete and post again if you are concerned about your IP privacy, as it will forever remain in the edit logs. Commented Feb 12, 2020 at 15:09
  • 1
    meta.stackexchange.com/questions/191121/… Commented Feb 12, 2020 at 15:13

1 Answer 1

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Short answer: You must define your public IPV6.

Long answer: I assume your ISP give you an IP, let's suppose you have 2001:0db8:0001:0001::0/64 as public IP (in fact public IPV6 network).

Now, try

sudo ip -6 addr add 2001:0db8:0001:0001::0022/128 dev enp3s0

on localhost (replacing value and network interface).

Note that you won't be able to test it from "inside". (I was unable to save at time when I had two internet providers). You might use online test ipv6 tools from internet.

You can validate your ipv6 connection using

ping -I enp3s0 ipv6.google.com
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