GMOD 13 non SRCDS server?Just portforward and HIt start mutliplayer?

Okay so in gmod 12 i had a server just by port forwarding,Now In gmod 13 it seems that you need srcds? I cant just forward my ports and hit start multi then sv_lan0? All i want is to be able to host a server for my friend and I.I need some help!

Just do 27015 on all ports and select both. Go on gmod and star new game and on the drop down menu where it says single player change it to 8 or whatever you would like