[PVE-User] NAT

Miguel González miguel_3_gonzalez at yahoo.es
Wed Nov 29 15:00:25 CET 2017

I have installed Proxmox 5.1. Can I have two vmbr ? One for the bridge
IPs and another for NAT? I want to have two VMs that only have access to
Internet but not reachable from outside.

Right now I have:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# for Routing
auto vmbr1
iface vmbr1 inet manual
bridge_ports dummy0
bridge_stp off
bridge_fd 0

# vmbr0: Bridging. Make sure to use only MAC adresses that were assigned
to you.
auto vmbr0
iface vmbr0 inet static
address x.x.x.x
network x.x.x.0
broadcast x.x.x.255
gateway x.x.x.254
bridge_ports eth0
bridge_stp off
bridge_fd 0

iface vmbr0 inet6 static
address 2001:41d0:0008:0d0c::
netmask 64
post-up /sbin/ip -f inet6 route add x.x.x.x dev vmbr0
post-up /sbin/ip -f inet6 route add default via x.x.x.x
pre-down /sbin/ip -f inet6 route del default via x.x.x.x
pre-down /sbin/ip -f inet6 route del x.x.x.x dev vmbr0

auto vmbr2
#private sub network
iface vmbr2 inet static
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 '' -o vmbr0 -j
post-down iptables -t nat -D POSTROUTING -s '' -o vmbr0 -j

But this is not working


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