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Muhammad Ikhwan Perwira
Asked: 2022-02-09 10:53:12 +0800 CST

Adding IPv6 interface into ifconfig worked but host unreachable when use it

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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)

ipv6

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