In the confs.ini put your external IP in the IPS line and forward the port 27016 UDP and TCP to your local IP in the router. That should mean that all traffic to that port goes to your internal IP address this is for dedicated server, which you can run then join via your game either over LAN or internet, I did this and it shows up in the client under internet.
Code:
[NET]
serverName=Blackrat test server
serverDescription=testing missions
speed=100000
localPort=27016
maxPlayers=16
serverInfo1=
serverInfo2=
serverInfo3=
serverInfo4=
VAC=1
[Console]
IP=20000
IPS=your external IP address
LOG=0
LOGTIME=0
LOGFILE=logs.txt
HISTORY=128
HISTORYCMD=128
WRAP=1
PAUSE=1
PAGE=20
LOGKEEP=1
[BOB]
difficulty=296222719
[sound]
SoundUse=0
speakers=-1
[core]
LinearObjectManager=1
Roads=0