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How to make Proxmox masquerade to secondary IP?

I have 2 IP addresses, but I want to Masquerade using secondary IP, guests using KVM-WinXP with LAN IP.
My primary IP is 192.95.31.41 (eth0) and secondary IP is 198.50.153.144.

Here is my /etc/network/interface:

Code:

# network interface settings
auto lo
iface lo inet loopback

iface eth0 inet manual

auto vmbr1
iface vmbr1 inet static
        address  192.168.0.1
        netmask  255.255.255.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0
        post-up /etc/pve/kvm-networking.sh

auto vmbr0
iface vmbr0 inet static
        address  192.95.31.41
        netmask  255.255.255.0
        gateway  192.95.31.254
        broadcast  192.95.31.255
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
        network 192.95.31.0

auto vmbr2
iface vmbr2 inet static
        address  198.50.153.144
        netmask  255.255.255.0
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '192.168.0.0/24' -o vmbr2 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '192.168.0.0/24' -o vmbr2 -j MASQUERADE

Above settings won't Masquerade using vmbr2 (but using vmbr0 was fine). Should I use eth0:0 for secondary IP?

Any advice how to setup this in Proxmox way?

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