I've installed a Proxmox VE 5.1 on a VirtualBox in macOS (10.12).
The guess OS, Debian Strech (Proxmox is built on debian), has 2 "physical" network interfaces (configured from VirtualBox),
NAT, I can access to internet through the NAT interface:
root@proxmox:~# traceroute 126.96.36.199 traceroute to 188.8.131.52 (184.108.40.206), 30 hops max, 60 byte packets 1 10.0.3.2 (10.0.3.2) 0.792 ms 0.694 ms 0.625 ms 2 1dot1dot1dot1.cloudflare-dns.com (220.127.116.11) 2.829 ms 2.818 ms 3.318 ms
The /etc/network/interfaces in the debian host contains:
auto lo iface lo inet loopback auto enp0s3 iface enp0s3 inet static address 192.168.56.101 netmask 255.255.255.0 auto enp0s8 iface enp0s8 inet static address 10.0.3.15 netmask 255.255.255.0 gateway 10.0.3.2 #NAT auto vmbr0 iface vmbr0 inet static address 172.16.1.1 netmask 255.255.255.0 bridge_ports dummy1 bridge_stp off bridge_fd 0
The "guest", debian sees to macOS ("host") from both interfaces (macOS IPs: 192.168.56.1, 10.0.3.2).
vmbr0 virtual interface was created for the proxmox LXC containers, I've added a iptables rule to send all the traffic from vmbr0 to the
enp0s8 interface (the NAT interface in VirtualBox).
iptables -A POSTROUTING -s 172.16.1.0/24 -o enp0s8 -j MASQUERADE -t nat
The problem is that when I create a LXC container inside proxmox, using the
vmbr0 as network interface, the LXC container has not internet access, I can ping to the proxmox "master" (IP: 172.16.1.1) but nothing else.
I've also tried to use enp0s8 as
bridge_ports parameter, same result.
/etc/network/interfaces in the LXC container (Ubuntu 16.04) contains:
auto eth0 iface eth0 inet static address 172.16.1.100 netmask 255.255.255.0 gateway 172.16.1.1
I have a quite similar config in another proxmox server (but in bare metal, not VirtualBox installation) and It works ok.
Can anyone tell me what is incorrect or missing in the network configuration to allow containers access to internet ?