archived.neilpahl.com (my old site)

Entry 2: Where Is My Server If Its Behind A Firewall?

Topic: OpenVPN on Ubuntu Server Behind Firewall   

Created on Thu, 03 May 2012.

If you are behind someone else's firewall, chances are you have a dynamic ip as well.

Usually to keep track of the external IP of a host with dynamic ip, I use a ddns service which is supported with my router. If my router doesn't support ddns, I use a simple script which will email me the external IP address of the host.

Behind a Firewall however, I have setup a reverse shh tunnel which can hold a persistent connection to an agent server. Then I can access the server which is behind the firewall by ssh'ing into the agent server at a specific port which will redirect me to the host behind the firewall. I will write a post on this when I get some time~

Similarly, there is a way to maintain an openVPN connection between two hosts. I will write about this in the coming future too.

Sorry for the short Log, but I just wanted to add a quick update to this topic.

PLEASE let me know if I'm doing something wrong, or if you have any suggestions or requests~

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