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I have VPS run on Ubuntu 20.04, I was asking to Customer Service of my VPS Provider, she said their service (VPS) currently is not supporting IPv6. Since she is not technical support, I believe my VPS itself support IPv6.

I said so because my VPS is responding another IPv6 when I ping my VPS. Not only ping, But also HTTP request with using IPv6. When I open my website which hosted in that VPS. I enter the IPv6 of my VPS in url form of my browser [xx:xx...:xx]:80 then it redirect to my domain. Since I intended setup redirect it in my VPS. That's why I more believe that's IPv6 is mine.

At first when I check ifconfig, yeah there are no IPv6 word that mention it. I manually add IPv6 with ifconfig command flags itself.

But unfortunately, when my VPS ping another IPv6 server, it said Host unreachable

So I guess that customer service is not true. My VPS have IPv6 although only for incoming connection even though unable to perform outcoming connection.

So Is it possible I can do Outcoming connection in my VPS with IPv6?

When I realized that my VPS has IPv6? It was when I login SSH with my another VPS with IPv6 only into my IPv4 only VPS. That's make me wonder why my IPv4 VPS accept that connection?

Edit: Output of ip -6 addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2001:xxx:xxx:xxx:x:x:xxx:xxx/112 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe19:dd6c/64 scope link
       valid_lft forever preferred_lft forever

Output of ip -6 route show

::1 dev lo proto kernel metric 256 pref medium
2001:xxx:xxx:xxx:xxx:xxx:1b70:0/112 dev ens3 proto kernel metric 256 pref medium
fe80::/64 dev ens3 proto kernel metric 256 pref medium

Edit: I turned off WARP Tunnel (3rd party) (there's no wgcf interface anymore)

This is when I run ping google DNS for example ping 2001:4860:4860::8888 Output: ping: connect: Network is unreachable

Ofcourse it will work if I use that 3rd party (warp tunnel or wgcf interface that actually using proxy)

Muhammad Ikhwan Perwira
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    First thing you should do is to remove `net-tools` with ifconfig and friends. It is simply unsuitable for configuring modern Linux, especially IPv6. It is even not installed by default in Debian, for around 5 years. Use `iproute2`. Ok, please show us `ip -6 addr show` and `ip -6 route show`. Don't mask private addresses (`fe80` etc.) – Nikita Kipriyanov Feb 08 '22 at 19:05
  • Output of ```ip -6 addr show```, there are three. ```1: lo```,```2:ens3```,```538:wgcf```. Ignore wgfc, because it's from warp tunnel or third party so that my VPS can access IPv6 resource. – Muhammad Ikhwan Perwira Feb 08 '22 at 19:13
  • Output of ```ip -6 route show``` is ```::1 dev lo proto kernel metric 256 pref medium 2001:67c:2b0:db32:0:1:1b70:0/112 dev ens3 proto kernel metric 256 pref medium fd01:5ca1:ab1e:896f:1ec3:382e:a7db:601f dev wgcf proto kernel metric 256 pref medium fe80::/64 dev ens3 proto kernel metric 256 pref medium``` – Muhammad Ikhwan Perwira Feb 08 '22 at 19:15
  • iproute2 is not default installed – Muhammad Ikhwan Perwira Feb 08 '22 at 19:16
  • I just noticed you are new here. Sorry if that was not obvious, can you please [edit your question](https://serverfault.com/posts/1093083/edit) and add info there instead? Don't post in comments, it's hard to read since formatting breaks. – Nikita Kipriyanov Feb 08 '22 at 19:31
  • @NikitaKipriyanov okay done. – Muhammad Ikhwan Perwira Feb 08 '22 at 19:34
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    I masked your public IPs. Ok, and so, you believe these 2001:....:4f78 is yours? Yes. Is that IP you are talking about? What did you ping where the network was unreachable? Also, I don't see a default IPv6 route in your routing table. That's strange, it is probably the cause. Were you following your hoster's instructions for enabling IPv6 carefully? – Nikita Kipriyanov Feb 08 '22 at 19:40
  • Yes, I believe that's my IPv6 IP. You can see in my edited question, just an example I ping google. However it's work when I use 3rd party or wgcf interface. I'm no wonder about it because it's actually using proxy. There's no default IPv6 route, if you see IPv6 global, it's because i was adding it manually. About hoster's instruction, what you mean with it? I don't feel I got any instruction. – Muhammad Ikhwan Perwira Feb 08 '22 at 19:49
  • What are instructions of your hoster? Can you link to them please? I am sure the problem is because there is no defautlt route. – Nikita Kipriyanov Feb 09 '22 at 09:05
  • I don't feel get any instruction from them. All I receive is their service (VPS) currently is not supporting IPv6. What link? – Muhammad Ikhwan Perwira Feb 09 '22 at 10:15
  • And so, what's the problem then? You know there is *no* IPv6 service. Why are you concerned with it? (And whatever, I think everything will be off topic from on now.) – Nikita Kipriyanov Feb 09 '22 at 10:56
  • So basically I can't add IPv6 manually – Muhammad Ikhwan Perwira Feb 09 '22 at 11:50
  • You can do this via VPN where the other endpoint *has* an connectivity. But this is, again, completely different question. – Nikita Kipriyanov Feb 09 '22 at 13:42
  • Yeah thank you,, that was I said when I said ```wgcf interface``` – Muhammad Ikhwan Perwira Feb 09 '22 at 15:00

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