Link to higher directories

I'm using primary link on my site to link to a higher directory.

Drupal is located at 192.168.1.30/Drupal
And I'm linking to 192.168.1.30/Test

When I approach my webserver from outside my domain it's at another IP address and therefore the internal links no longer work.
In HTML I can use "../Test" to link to, but in the primary links section an error is generated telling me the url is invalid.

Is there a way around this? Something like linking to $base_root/Test?