I'm a new Ubuntu user and I did this steps recently, with 'AskUbuntu' support: - installation of Ubuntu, ownCloud server + client, Oracle VirtualMachine - configured ddns (duckdns.org) - port forward, necessary for the ddns work properly.

I can access Owncloud from other machines, using my local network. But I can't access my owncloud server when I'm outside of my local network. I'm using wired network at home, where the Ubuntu machine is installed.

Talking to a friend I realized that I need to set up a static IP to make the DDNS work properly and, then, have access to ownCloud from outside my local network. I searched the documentation at https://help.ubuntu.com/lts/serverguide/network-configuration.html

Then, I followed all the advices and changed the files /etc/network/interfaces /etc/resolv.conf /etc/hosts

I used my address, netmask and gateway. I'm sure the numbers used to address, netmask and gateway are correct. I used 'ifconfig' and route -n to check it.

I also restarted the network, shutting down the system. After start the machine again, the wired network doesn't work.

Please help me to find where is my mistake.

Thanks a lot!

  • It's hard to guess unless you include the contents of those files - or at least a clearer definition of "doesn't work" (interface doesn't come up? doesn't accept incoming traffic? doesn't route outgoing traffic? doesn't resolve names?) – steeldriver Feb 15 '16 at 17:54
  • Editing the files you described only changes things for the machine on which you've made the changes. – earthmeLon Feb 15 '16 at 18:02

In order for machines outside of your LAN (ie: The Internet, WAN) to have access to a machine inside of your LAN, you'll need a few things.

  1. The WAN IP for your Network
  2. A NAT-capable Router/Gateway
  3. Port-Forwarding from the WAN IP:PORT to the LAN IP:PORT


You can set up a true DNS solution if your IP doesn't change. Another option would be to look into dynamic dns providers.

Depending on your Router/Gateway, you may have settings to automatically update different dynamic dns providers with your new IP if it changes. I would recommend using one of these services if your Router/Gateway supports it. One such Router/Gateway firmware that supports dynamic dns is DD-WRT.


This just means you need to have a Router/Gateway that allows multiple clients to connect to it and share the Internet connection. This is a typical setup, but thought it was worth mentioning.

Port Forwarding

You will be connecting to ownCloud through ports 80 or 443 (TCP). This is http:// or https://, so it is highly recommended that you connect and force connections through https.

Your Router/Gateway needs to be set up so that it forwards all connections from its WAN IP:PORT to your machine's LAN IP:PORT.

On the machine running ownCloud, you can run ifconfig to determine your IP. Go to your Router/Gateway configuration and ensure these ports are forwarded.

  • Thanks! My WAN IP is dynamic and I'm using DuckDNS as provider for dynamic dns. My router allows multiple clients and the port forwarding is OK using a http:// for a while. I will configure the https:// as soon as solve the problem I mentioned here. – Hugo Feb 15 '16 at 18:33
  • Nice. Do you understand that you're missing Port Forwarding? Also, I highly recommend you go ahead and get HTTPS working on your LAN and solve that problem BEFORE opening ownCloud up to the Internet. – earthmeLon Feb 15 '16 at 18:36
  • I did the port forwarding since the begining. It's ok, I configure the https before set up the static ip. Thanks! – Hugo Feb 15 '16 at 18:54
  • If this answer helped you, please mark it as a solution :D Best of luck! – earthmeLon Feb 15 '16 at 18:57
  • Well, let me be more precise, as @steeldriver asked. My IP Address is (www.whatismyip.com). The ifconfig command returns as follows: – Hugo Feb 16 '16 at 1:10

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