After you have this plugin in your L4D/L4D2 server, tanks can be knocked back by melee weapons e.g. fire axe.
The original author is ztar, his/her homepage (In Japanese) is
http://ztar.blog7.fc2.com/. I upgrade the code to the new syntax and add a threshold for the weapon size, with this new feature (if enabled by l4d2_homerun_largemelee, disabled by default), survivors can only knock back tanks with larger versions of melee weapons dropped by tanks (This is a feature of a plugin called "Melee Weapon Tank
" which is available
here)
The rest of functions are not changed at all.