Answer: To connect to Factorio via IP, ensure the host has a static IP, forward port 34197 on their router, and share their public IP with players. Joiners input “IP Address:Port” in Factorio’s multiplayer menu. Issues often stem from incorrect port forwarding or firewalls blocking the connection. Verify network settings and use third-party tools like PortCheckTool for validation.
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How to Find Your IP Address for Factorio?
Your public IP is required for external connections. Hosts can find it via websites like WhatIsMyIP.com. For local LAN games, use the host’s private IP (found via Command Prompt with ipconfig on Windows or ifconfig on Linux/macOS). Note: Public IPs change unless a static IP is set through your ISP or router settings.
When working with IPv6 addresses, check your router’s compatibility as some older models may not support modern protocols. For Windows users, the ipconfig /all command provides detailed network adapter information including DHCP status and DNS servers. macOS users can utilize the Network Utility app for graphical representation of their network configuration.
| Operating System | Command | Output Contains |
|---|---|---|
| Windows | ipconfig |
IPv4 Address, Default Gateway |
| Linux | ip addr show |
Global IPv6 Addresses |
| macOS | ifconfig en0 |
Subnet Mask, MAC Address |
What Ports Need Forwarding for Factorio Multiplayer?
Factorio uses UDP port 34197 by default. Forward this port in your router settings to allow inbound traffic. Steps vary by router: typically, access admin panel (e.g., 192.168.1.1), navigate to Port Forwarding, and create a rule for UDP 34197 tied to the host’s local IP. Test port openness with tools like PortCheckTool or CanYouSeeMe.org.
Why Can’t Players Join My Factorio Server?
Common issues include incorrect port forwarding, dynamic IP changes, or firewall restrictions. Ensure: (1) Port 34197 is open and forwarded correctly, (2) Windows Defender/firewall allows Factorio traffic, (3) The host’s IP hasn’t changed. For persistent problems, use a VPN like Hamachi to simulate a LAN network, bypassing complex router configurations.
Advanced troubleshooting should include checking NAT type (strict/moderate/open) and verifying UPnP functionality. Some routers require additional configuration for hairpin NAT when connecting via local IP while hosting. Players experiencing “Connection Timed Out” errors should verify their anti-virus isn’t blocking the game executable.
| Error Message | Likely Cause | Solution |
|---|---|---|
| “Couldn’t Establish Connection” | Port Forwarding Failure | Verify UDP 34197 rule |
| “Invalid Password” | Server Configuration Error | Check server-settings.json |
| “Version Mismatch” | Update Discrepancy | Sync game versions |
How to Use Factorio’s Console for Network Diagnostics?
Factorio’s debug console helps identify connection issues. Enable it via Settings → Interface → Show Debug Info. Use commands like /c game.print(game.network_status) to check latency and packet loss. For advanced diagnostics, enable verbose logging in config/config.ini and review logs for timeout errors or NAT traversal failures.
What Are the Best Practices for Stable Factorio Multiplayer?
Optimize stability by: (1) Using wired Ethernet connections, (2) Limiting background bandwidth usage, (3) Updating router firmware, (4) Assigning static IPs to all devices, and (5) Using QoS settings to prioritize Factorio traffic. For large bases, reduce autosave intervals and disable mods until connectivity is confirmed.
“Factorio’s P2P architecture relies heavily on UDP, which many ISPs throttle. I recommend hosting dedicated servers for large-scale games—it reduces latency and bypasses client-side port forwarding. Tools like AWS EC2 or Linode offer $5/month servers with static IPs, ideal for persistent worlds.”
– Network Engineer, Gaming Server Hosting Industry
Conclusion
Connecting via IP in Factorio demands precise network configuration but becomes seamless with practice. Prioritize port forwarding, static IPs, and firewall management. For casual play, consider third-party server hosting to offload technical complexities. Always test connections incrementally, starting with LAN before attempting public IP setups.
FAQs
- Does Factorio Support IPv6 Connections?
- Yes, but IPv6 adoption varies by ISP. Use
ipconfig/ifconfigto check for an IPv6 address. Update port forwarding rules to accommodate IPv6 if needed, though most home networks still rely on IPv4. - Can I Connect via Domain Name Instead of IP?
- Yes—use dynamic DNS services like No-IP or DuckDNS to map a domain name to your changing public IP. Configure your router to update the DNS record automatically, allowing players to join via a fixed URL.
- Are Mods Compatible with Direct IP Connections?
- Yes, but all players must have identical mods and versions. Mismatches cause connection failures. Use Factorio’s built-in mod sync or platforms like FactorioMods.com for version control.