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I have a fresh Ubuntu 16.04 LTS VM installed on my cloud provider. I cannot get IPv4 connectivity but only IPv6. I can connect to my VM through secure shell and I can also reach it through its domain name (I have installed an Apache HTTP server and I can see the test page). However, I wonder why I don't have normal access to the internet. For example, when I run sudo apt-get update some package repositories seem to be reachable while others don't. I have also tried to ping various web sites with no success.

What is going on? What should I do to allow my VM to have normal network access?

ifconfig 

eth0      Link encap:Ethernet  HWaddr aa:00:02:ed:99:a2  
              inet6 addr: fe80::a800:2ff:feed:99a2/64 Scope:Link
              inet6 addr: 2001:648:2ffc:1225:a800:2ff:feed:99a2/64 Scope:Global
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:5690 errors:0 dropped:0 overruns:0 frame:0
              TX packets:3475 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2910088 (2.9 MB)  TX bytes:534675 (534.6 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:225 errors:0 dropped:0 overruns:0 frame:0
          TX packets:225 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:24067 (24.0 KB)  TX bytes:24067 (24.0 KB)
rfc2460
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Pantelis Natsiavas
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    Does your provider actually provide IPv4 addresses at all? What's in your system logs? – Michael Hampton Jan 15 '19 at 18:00
  • My cloud provider gives 3 IPv4 addresses for 20 VMs. For this VM, I cannot use an IPv4 address as I need them for other VMs. Which log do you refer to exactly? – Pantelis Natsiavas Jan 16 '19 at 12:02
  • I would first check /var/log/syslog. That's where common system activity gets logged. But if your VM hasn't got IPv4 connectivity at all, then there is no point. You can only access IPv6 sites. – Michael Hampton Jan 16 '19 at 14:48

1 Answers1

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There is a few different transition technologies which will allow an IPv6-only client to reach an IPv4-only service. I would expect most IPv6-only hosting providers to offer one of those transition solutions in their default configuration. And I believe DNS64+NAT64 is the transition solution most often chosen for this.

You should ask your provider if they have a DNS64+NAT64 setup for you to use.

Should the provider not have any NAT64 there is a few public NAT64 that you can make use of. I know of two providers which are currently operational:

kasperd
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