Port forwarding for IPv4 and IPv6?

[ajmas]

Can anyone tell me whether port forwarding can do both IPv4 and IPv6 at the same time?

Currently I have a guest VM running Ubuntu 18.04.1 LTS, with an Nginx server running on port 80 & 443. This is port forwarded to 8080 and 8443 on the host OS.

Result of using wget to connect to Nginx from guest VM:

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   wget "http://localhost/" --> works
   wget "http://127.0.0.1/" --> works
   wget "http://[::1]/" --> works

and on host OS:

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  wget "http://localhost:8080/" --> works
  wget "http://127.0.0.1:8080/" --> works
  wget "http://[::1]:8080/" --> Connection refused.
  wget -6 "http://localhost:8080/" --> Connection refused.

Doing an 'lsof' on the host I see 8080 is only bound to IPv4, while in guest it is IPv6 (which supports both IPv4 and IPv6).

Note, I did initially provision this VM via Vagrant, but this seems to be more an issue at the VB level?

In the VB port forwarding dialogue

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Protocol  Host IP      Host Port   Guest IP   Guest Port
--------  -----------  ----------  ---------  ---------
  TCP     127.0.01     2222                   22
  TCP                  8080                   80
  TCP                  8443                   443

lsof output on guest:

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COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 2711 root    4u  IPv6  26305      0t0  TCP *:http (LISTEN)

lsof output on host:

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COMMAND     PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
VBoxHeadl 77727 userx   17u  IPv4 0xac95ec5790dd279d      0t0  TCP *:http-alt (LISTEN)

[socratis]

Note, I did initially provision this VM via Vagrant, but this seems to be more an issue at the VB level?

The one area that Vagrant screws up royally in VirtualBox, is networking. From custom networks, to specific port forwarding rules, to name it. Please completely uninstall Vagrant, make sure that it hasn't tainted your "VirtualBox.xml" and then create a new Vagrant-less VM. See what you get...

But to tell you the truth, I haven't seen any IPv6 port forwarding rules so far, only IPv4...