Environment
Proxmox VE: 9.x (latest kernel at time of posting)
pve-firewall (iptables backend
Guests: LXC on a Linux VLAN, LXC on a Linux Bridge
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
pre-up sysctl -w net.ipv4.ip_forward=1
auto nic0
iface nic0 inet manual
auto...