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+====== Create NAT Bridge in Proxmox ======
+Tested on Proxmox on Debian 8.
+  - Modify /etc/network/interfaces to add NAT iptables <code - /etc/network/interfaces>
+auto vmbr1
+iface vmbr1 inet static
+        address  100.64.43.1
+        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 '100.64.43.0/24' -o eth0 -j MASQUERADE
+        post-down iptables -t nat -D POSTROUTING -s '100.64.43.0/24' -o eth0 -j MASQUERADE
+</code>
+  - Install dnsmasq <code>apt install -y dnsmasq</code>
+  - Modify /etc/dnsmasq.d/config<code - /etc/dnsmasq.d/config>
+domain-needed
+bogus-priv
+local=/cloud/
+domain=cloud
+dhcp-fqdn
+interface=vmbr1
+bind-interfaces
+dhcp-range=100.64.43.200,100.64.43.250,72h
+dhcp-option=option:router,100.64.43.1
+dhcp-option=option:dns-server,100.64.43.1
+</code>
+  - If IPv6 is available, append this snippets<code - /etc/dnsmasq.d/config>
+enable-ra
+dhcp-range=2001:xxxx:xxxx:xxxx::1000,2001:xxxx:xxxx:xxxx::1fff
+dhcp-option=option6:dns-server,[2001:xxxx:xxxx:xxxx::]
+</code>
+  - Enable and start dnsmasq<code>
+systemctl enable dnsmasq
+systemctl restart dnsmasq
+</code>
+{{tag>proxmox nat dnsmasq}}