What is dproto?
The dproto plugin allow the players from steam and non-steam (47/48) to connect on your server!
Install
Download the archive form here
If you are using HLDS latest version use this version of dproto: dproto_0_9_582_p.zip
Extract the archive content to your desktop, copy dproto.cfg inside your server, cstrike folder.
Now go inside the directory bin/linux and copy dproto_i386.so inside your server, addons/metamod/dlls folder.
Add new line at the end of the file cstrike/addons/metamod/plugins.ini
linux addons/metamod/dlls/dproto_i386.so