OPNsense Forum

Hello everyone,

I'm setting up a new OPNsense installation behind a Fritzbox (192.168.178.1) and I'm encountering a persistent issue where the OPNsense box itself cannot access the internet — no firmware updates, no DNS resolution, and no successful ping to external IPs (e.g. 1.1.1.1 or 8.8.8.8). I'd appreciate any insight.

Setup:

• Fritzbox (main internet gateway): 192.168.178.1
• OPNsense WAN IP: 192.168.178.2 (static)
• OPNsense LAN IP: 192.168.10.1 (static)
• LAN subnet: 192.168.10.0/24
• DHCP Server (enabled):
     
  • Range: 192.168.10.10 – 192.168.10.245
  • Gateway & DNS: 192.168.10.1
• Unbound DNS Resolver: enabled and active
• Default Gateway: manually set to 192.168.178.1 and marked as upstream
• Firewall Rules:
     
  • LAN: default rules allow all IPv4 and IPv6 from LAN net to any
  • WAN: manually created rule to allow WAN → ANY (interface: WAN, direction: out, source: any, destination: any, protocol: any)

Problems Observed:

• From OPNsense Diagnostics:
     
  • Ping to 1.1.1.1: 100% packet loss
  • DNS Lookup to 8.8.8.8 or 1.1.1.1: fails with "error creating socket"
• Firmware updates fail with timeout/errors
• Client devices (connected to LAN) receive DHCP leases correctly and appear in DHCP lease table
• However: client devices also have no internet connectivity

Troubleshooting Attempts:

• Verified interface assignments (WAN = re1, LAN = re0)
• Disabled "Block private networks" and "Block bogon networks" on both interfaces
• Verified Unbound DNS is listening on all interfaces
• Rebooted OPNsense multiple times after config changes
• Verified cables and link lights
• Tested both static and dynamic addressing
• Manually created WAN firewall rule to allow outbound traffic
• Gateway is shown as "Online" in system routing diagnostics

Goal:

I want OPNsense to act as the internal gateway and firewall, with DHCP and DNS for clients on 192.168.10.0/24, and access the internet via the Fritzbox through the WAN interface. I also want the OPNsense box itself to reach the internet for updates, DNS queries, etc.

Suspicions:

• Possibly a NAT or routing issue?
• Missing firewall rule for OPNsense-originated traffic?
• Unbound DNS misconfiguration?

Any help would be highly appreciated. I'm open to resetting parts if needed.

Thank you in advance!

See this (https://forum.opnsense.org/index.php?topic=42985.0), points 4 and especially, 6. Also: https://forum.opnsense.org/index.php?topic=39556.0