Proxmox and CSF - LAN vmbr2 not working
If somehow you have Proxmox & CSF for blocking outside traffic vmbr0 (WAN), and have a vmbr2 LAN interface, check your ETH_DEVICE abd ETH_DEVICE_SKIP settings in /etc/csf/csf.conf and add vmbr2 in ETH_DEVICE_SKIP so it won't block internal LAN traffic.
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System Administration
Linux