CnCNet Tunnel Server

• .NET 9
• Cross platform (Windows, Linux, Mac, ...)
• No admin privileges required to run
• Supports CnCNet V2 & V3 tunnel protocol
• Supports CnCNet STUN protocol (for P2P clients)
• Supports IPv4 & IPv6

How to run/install

• The V3 version requires the .NET Runtime 9.
• The V3+V2 version additionally requires the ASP.NET Core Runtime 9.

Make sure these ports are open/forwarded to the machine (default ports):

• TCP 50000 (V2)
• UDP 50000 (V2)
• UDP 50001 (V3)
• UDP 3478
• UDP 8054
• ICMP (for clients not using the built-in ping mechanism)

Arguments

To see a list of possible arguments run:

cncnet-server -?

Example output:

Description:
  CnCNet tunnel server

Usage:
  cncnet-server [options]

Options:
  --n, --name <name> (REQUIRED)                            Name of the server
  --p, --tunnelport <tunnelport>                           Port used for the V3 tunnel server [default: 50001]
  --p2, --tunnelv2port <tunnelv2port>                      Port used for the V2 tunnel server [default: 50000]
  --m, --maxclients <maxclients>                           Maximum clients allowed on the tunnel server [default: 200]
  --nm, --nomasterannounce                                 Don't register to master [default: False]
  --masp, --masterpassword <masterpassword>                Master password []
  --maintenancepassword, --maip <maintenancepassword>      Maintenance password []
  --masterserverurl, --mu <masterserverurl>                Master server URL [default:
                                                           https://cncnet.org/master-announce]
  --i, --iplimit <iplimit>                                 Maximum clients allowed per IP address [default: 8]
  --nopeertopeer, --np                                     Disable STUN NAT traversal server (UDP 8054 & 3478)
                                                           [default: False]
  --3, --tunnelv3enabled                                   Start a V3 tunnel server [default: True]
  --2, --tunnelv2enabled                                   Start a V2 tunnel server [default: True]
  --sel, --serverloglevel                                  CnCNet server messages log level [default: Information]
  <Critical|Debug|Error|Information|None|Trace|Warning>
  --syl, --systemloglevel                                  Low level system messages log level [default: Warning]
  <Critical|Debug|Error|Information|None|Trace|Warning>
  --6, --announceipv6                                      Announce IPv6 address to master server [default: True]
  --4, --announceipv4                                      Announce IPv4 address to master server [default: True]
  --h, --tunnelv2https                                     Use https Tunnel V2 web server [default: False]
  --maxpacketsize, --mps <maxpacketsize>                   Maximum accepted packet size [default: 2048]
  --maxpingsglobal, --mpg <maxpingsglobal>                 Maximum accepted ping requests globally [default: 1024]
  --maxpingsperip, --mpi <maxpingsperip>                   Maximum accepted ping requests per IP [default: 20]
  --ai, --masterannounceinterval <masterannounceinterval>  Master server announce interval in seconds [default: 60]
  --c, --clienttimeout <clienttimeout>                     Client timeout in seconds [default: 60]
  --version                                                Show version information
  -?, -h, --help                                           Show help and usage information

Start from console

cncnet-server --name NewServer

Install as a service on Windows (using PowerShell)

Download <cncnet-server-win-x64.zip>

Extract to e.g. C:\cncnet-server\

New-Service -Name CnCNetServer -BinaryPathName '"C:\cncnet-server\cncnet-server.exe" --name "NewServer"' -StartupType "Automatic" -DisplayName "CnCNet Tunnel Server" -Description "CnCNet Tunnel Server"

Start-Service CnCNetServer

Install as a service on Linux (Ubuntu example)

wget https://packages.microsoft.com/config/ubuntu/22.10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb
sudo apt-get update && \
  sudo apt-get install -y aspnetcore-runtime-9.0

wget <cncnet-server-linux-x64.zip>

unzip -d cncnet-server <cncnet-server-linux-x64.zip>

useradd cncnet-server

passwd cncnet-server

chown cncnet-server -R /home/cncnet-server

cd /home/cncnet-server/

chmod +x cncnet-server

cd /etc/systemd/system/

vi cncnet-server.service

cncnet-server.service example contents:

[Unit]
Description=CnCNet Tunnel Server

[Service]
Type=notify
WorkingDirectory=/home/cncnet-server
ExecStart=/home/cncnet-server/cncnet-server --n "NewServer" --masp "PW" --maip "PW" --m 250
SyslogIdentifier=CnCNet-Server
User=cncnet-server
Restart=always
RestartSec=5

KillSignal=SIGINT
Environment=DOTNET_ENVIRONMENT=Production
Environment=ASPNETCORE_ENVIRONMENT=Production
Environment=DOTNET_PRINT_TELEMETRY_MESSAGE=false

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl start cncnet-server.service

sudo ufw allow proto tcp from any to any port 50000
sudo ufw allow proto udp from any to any port 50000
sudo ufw allow proto udp from any to any port 50001
sudo ufw allow proto udp from any to any port 3478
sudo ufw allow proto udp from any to any port 8054

to start on machine start:

sudo systemctl enable cncnet-server.service

to inspect logs:

sudo journalctl -u cncnet-server