installation - How to download a .tar.gz file from a redirected link in terminal?

I want to download the file at http://www.snort.org/downloads/1806 as a .tar.gz file using terminal but the problem is that when I use:

sudo wget http://www.snort.org/downloads/1806

It downloads a file and names it 1806 but it isn't a folder not a .tar.gz file which I can extract.

Please let me know how can I do this from within the terminal.

Regards.