1. Open SPF.
2. Go to Tools -> Advanced Rules.
3. Click 'Add'.
4. In the 'Rule Description' box under the 'General' tab, type something
sensible like 'Blocking Off Campus IPs'.
5. Under the 'Hosts' tab, select 'IP Addresses' and in the box paste
0.0.0.0-126.254.254.254,127.0.0.2-137.204.254.254,137.206.0.0-254.254.254.254.
6. Under the 'Applications' tab, find and tick the box for ONLY DC++ from the list of
applications.
7. Click OK.
Done.