can´t access Internet on Soyoustart (OVH) with Proxmox 5.3


Nov 27, 2017

I am migrating some VMs from a Soyoustart (OVH) Proxmox 5.1 to a
brand new Proxmox 5.3 server (again Soyoustart).

I have followed the instructions from OVH and Proxmox and I can ping
from the VM to the host and the gateway and I can ping from the host to
the VM. But I can´t ping the DNS server or anything outside the host
machine (i.e.: the legacy Proxmox host).

Some people suggest to enable ip forwarding, but I don´t have enabled
on the legacy server.

But I enable it anyway echo 1 > /proc/sys/net/ipv4/ip_forward

and nothing happens.

iptables seems to be turned off both in host and vm:

   iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination       

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination       

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

So I´m out of ideas here

Any suggestion?
Depends on the details of network configuration (in Proxmox host /etc/network/interfaces ). Assuming you have a routing setup (and no public IPs in your VMs) you must not forget to activate NAT in the host (since the local IP addresses are not known outside your Proxmox environment).
Do you use the same IPs for the VMs and the same MAC? Otherwise there might a (virtual) MAC / IP Binding on OVH side?

Please paste the VM Config here.


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