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I am using ubuntu-server 19.10 and I can only ping (from what I have tried) google.com, youtube.com and ubuntu.com.

I however cannot ping, wget or git clone from github.com, cnet.com, duckduckgo.com, sourceforge.net, 8.8.8.8, 172.217.17.142 ...

Whenever I try to ping them I get the message: 

ping: connect: Network is unreachable

How can I connect to the websites?

EDIT: ping -n xyz gets the same result. 

traceroute -n duckduckgo.com:
traceroute to duckduckgo.com (79.125.108.59) hops max, 60 byte packets
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It looks like these having A and AAAA-Records registered properly:

  • google.com
  • youtube.com
  • ubuntu.com

It looks like those dont have / misconfigured AAAA-Records but have A-Records:

  • github.com
  • cnet.com
  • duckduckgo.com

Tested with this DNS Record Viewer

Does your server get a public IPv4?

To me it looks like your server can't access servers that only have an DNS A-Record cause it doesn't have an IPv4-adress itself. If that is the case you can:

  • try / ask for assigning an IPv4 to your server
  • tuneling IPv6 to IPv4 by a proxy software i.e. 6tunnel or similar
  • wait / ask for those website IPv6 support
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    I somehow didn't have an ipv4 address. Thanks. – hubbledeepfield Mar 16 '20 at 12:35
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    I had this once in my home network. It was interresting to observe which part of the internet works with IPv6 only, and which part doesn't. – Paŭlo Ebermann Mar 17 '20 at 0:43
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    @PaŭloEbermann you might already know: There are internet providers applying DS-Lite to (private) customers. This means you will get a personal IPv6 but share IPv4 with other customer. As long as you access internet from your personal router you are all good unless you want to setup a server within a DMZ etc. on your side that can be accessed from internet. This will only work if the person accessing server has IPv6 - if the person will possibly only have IPv4 you should set up a tunnel / proxy on an IPv4&IPv6-ready internet server that routes from IPv4 to IPv6 going to your router this way. – David Renner Mar 17 '20 at 9:30

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