'Subdomain with port number in Ubuntu 12.04 (Precise Pangolin)

I have created subdomain in my DNS server. How can I set each subdomain so that it only accepts connections via a particular port?

For example: ftp.example.com → only accepts connections that come from port 21

subdomain


Solution 1:[1]

You can set port restrictions using iptables.

You can also set port restrictions on the server itself and it depends on your server architecture. If you're running Apache, then you should take a look at defining a virtual host (vhost).

Just for illustration sake:

<VirtualHost *:21>
        ServerAdmin [email protected]
        ServerName ftp.example.com

        # Index + Directory root
        DirectoryIndex index.php | index.html
        DocumentRoot /var/www/path/to/site
</VirtualHost>

See that "*:21" - that's the port number.

Generally speaking, ftp.example.com would probably still redirect to your server's root directory.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Peter Mortensen

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