Proxmox Master Host

etc-network-interfaces

auto vmbr1
iface vmbr1 inet static
    address 10.10.10.254
    netmask 255.255.255.0
    bridge_ports none
    bridge_stp off
    bridge_fd 0
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
    post-up iptables -t nat -A POSTROUTING -s '10.10.10.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o vmbr0 -j MASQUERADE

iptables

iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 80 -j DNAT --to-destination 10.10.10.1:80
iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 443 -j DNAT --to-destination 10.10.10.1:443