Proxmox Network Troubleshooting#

What Was Established#

Troubleshooting steps for resolving connectivity loss to Proxmox nodes, specifically addressing IP conflicts and subnet mismatches.

Key Decisions#

• Static IP Reservation: Proxmox nodes should always have a static IP (e.g., 192.168.0.69) that is excluded from the OPNsense DHCP pool.

Current Configuration#

Troubleshooting Workflow#

1. Verify Connectivity: ping 192.168.0.69.
2. Check Local Config: Log in via console and verify /etc/network/interfaces:

   auto vmbr0
   iface vmbr0 inet static
       address 192.168.0.69/24
       gateway 192.168.0.1
       bridge-ports enp3s0

3. Check for IP Conflicts: Ensure no other device (via DHCP) has been assigned 192.168.0.69.
4. ARP Cache: Clear local ARP cache if IP conflicts are suspected: arp -d 192.168.0.69.

Historical Notes#

Identified an issue where a DHCP client was assigned 192.168.0.69, conflicting with the Proxmox static IP.

Related Pages#

OPNsense DHCP Configuration, Wi-Fi Performance Optimization (U7 Lite)

Sources#

Adjust IP Assignment Range in OPNsense · ingested/chats/adjust_ip_assignment_range_in_opnsense.md