[PVE-User] Newbie can't connect VMs with the Internet

Alwin Antreich

2015-10-15 10:09:00 UTC

Hi there,

if you want to route your traffic between those two bridges, you need to setup a router/gateway.

Eg.: internet <-> vmbr0 (switch) <-> router <-> vmbr1 (switch) <-> VMs

You could choose a VM or configure Proxmox to be the router/gateway, I suggest using a VM as you don't need to configure
proxmox as router/gateway, less complex setup.

Regards,
Alwin Antreich

Hopefully this is just something I am overlooking, and another set of eyes will find it quickly. My host machine is
running proxmox 2.4-11/6502936f, and I have two VMs both running ubuntu 14.04.3.
The VMs can see (ping and ssh) each other, and the host machine, but they cannot connect to the Internet.
(What is the proper term for the host machine?)
https://pve.proxmox.com/wiki/Network_Model Masquerading (NAT)
http://forum.proxmox.com/threads/16710-Proxmox-VE-NAT-AND-BRIDGE-with-1-Physical-Interface
https://raymii.org/s/tutorials/Proxmox_VE_One_Public_IP.html
On the Network tab for the container machine I see
Name Type Active Auto... ports IP addr
eth0 Network Device No No
eth1 Network Device No No
vmbr0 Linux Bridge No Yes eth0 62.210.188.129
vmbr1 Linux Bridge No Yes 10.0.0.1
Name subnet gateway
eth0
eth1
vmbr0 255.255.255.0 62.210.188.1
vmbr1 255.255.255.0
I find it interesting that nothing is Active even though Autostart is on for both of the bridges, but since the machine
is connected to the Internet, and has access to the VMs, it probably isn't the problem...
On the Hardware tab of both VMs the Network Device is set to Bridged Mode, with the bridge set to vmbr1. The model and
MAC address are left at their default values.
=====================================================================
# network interface settings
auto lo
iface lo inet loopback
iface eth0 inet manual
iface eth1 inet manual
auto vmbr0
iface vmbr0 inet static
address 62.210.188.129
netmask 255.255.255.0
gateway 62.210.188.1
bridge_ports eth0
bridge_stp off
bridge_fd 0
auto vmbr1
iface vmbr1 inet static
address 10.0.0.1
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 '10.0.0.0.0/24' -o vmbr0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.0.0.0.0/24' -o vmbr0 -j MASQUERADE
# VM 1
post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 2201 -j DNAT --to 10.0.0.101:22
post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 2201 -j DNAT --to 10.0.0.101:22
# VM 2
post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 2202 -j DNAT --to 10.0.0.102:22
post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 2202 -j DNAT --to 10.0.0.102:22
=====================================================================
=====================================================================
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 10.0.0.101
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
gateway 10.0.0.1
dns-nameservers 10.0.0.1
=====================================================================
=====================================================================
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 10.0.0.102
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
gateway 10.0.0.1
dns-nameservers 10.0.0.1
=====================================================================
Is there anything else I should have reported?
Any ideas on what to try next?
Thanks,
Rick
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