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user241281
Asked: 2016-05-07 04:41:23 +0800 CST

How to achieve resolving of the same hostname to different IP addresses based on location

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I have personal webserver with ownCloud installed. This webserver has no public IP address because my internet connection does not offer it. I ordered virtual linux webserver with a public IP address and I use it just for port forwarding via SSH to allow my ownCloud server be accessible from the internet. Everything works fine and I am accessing the ownCloud via a hostname - example: "mytunneledowncloud.com".

But as I have limited high speed data on my internet connection, I would like to save some data by synchronizing ownCloud via LAN private IP address when I am at home and not via ssh tunneled public ip address of my virtual server. I am thinking whether this is even possible. I would need to resolve "mytunneledowncloud.com" as:

  • private ip address - in case I am on home LAN
  • public ip address - in case I am not on home LAN

To be honest, I know this is a bit "ridiculous" request, but maybe there is some "workaround" for it.

Note: I use Ubuntu on all my servers and PCs.

ip

1 Answers

  1. Best Answer

    Finally I got the resolution for the "problem" and it is very simple. I followed these steps:

    1. installed dnsmasq on my home server so it will become a very simple dns server
    2. in my home server I added an entry with the private ip address of my home server into /etc/hosts with domain name "mytunneledowncloud.com"
    3. configured my home server's DHCP daemon to assign home server's private IP as a DNS server to the clients

    Now it works perfectly. My home server now acts as dhcp/dns/web server and it assigns its own private ip as a dns server to the connected LAN clients. Then clients send the requests for the DNS resolution to my home server. My home server's dnsmasq looks into its /etc/hosts whether there is an entry for the requested domain name and if there is a match, provide the IP from there and if there is no match, then it uses the "internet's" DNS servers to resolve it.

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