No Network Device in Guest

[Breymja]

Hello,
i managed to migrate my KVM Images to my new ProxMox host. Unfortunatley i can't get the guests to get internet access. I use a routed configuration and gave the guest a virtio vmbr0 network card. But when i start the machine and type ifconfig i only got docker0 and lo - but no ens3 like before in my kvm. Therefore i cant ifup ens3. What am i doing wrong?

Host-Config:

auto lo
iface lo inet loopback

auto enp0s31f6
iface enp0s31f6 inet static
address 88.198.**.**
broadcast 88.198.**.***
gateway 88.198.**.**
netmask 255.255.255.255
pointopoint 88.198.**.**

iface enp0s31f6 inet6 static
address 2a01:4f8:a0:****::1
gateway fe80::1
netmask 128
up sysctl -p

auto vmbr0
iface vmbr0 inet static
address 88.198.***.***
bridge_fd 0
bridge_ports none
bridge_stp off
netmask 255.255.255.255
up route add -host 88.198.**.** dev vmbr0
up route add -host 88.198.**.** dev vmbr0
up route add -host 88.198.**.*** dev vmbr0

iface vmbr0 inet6 static
address 2a01:4f8:a0:****::1
netmask 64

Guest:

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

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto ens3
iface ens3 inet static
address 88.198.**.**
broadcast 88.198.**.**
dns-nameservers 213.133.98.98 213.133.99.99
dns-search ****
gateway 88.198.**.**
netmask 255.255.255.192
network 88.198.**.**

iface ens3 inet6 static
address 2a01:4f8:a0:****::2
gateway 2a01:4f8:a0:****::1
dns-nameservers 2a01:4f8:0:a0a1::add:1010
netmask 64
up sysctl -p

 

[Breymja]

Well, it just got renamed to ens18 - okay. But i still can't get an internet connection. I suppose that to be because i can't ifup vmbr0 as of:

Waiting for vmbr0 to get ready (MAXWAIT is 2 seconds).
RTNETLINK answers: File exists
ifup: failed to bring up vmbr0

As of search this seems to be caused because i configured enpos31f6 - but this was the config i used fine when using kvm only. Why and how to configure it correctly for ProxMox!?

 

[Breymja]

Okay, this seems to fix the problem:

auto lo
iface lo inet loopback
iface lo inet6 loopback

auto enp0s31f6
iface enp0s31f6 inet manual
iface enp0s31f6 inet6 manual

auto vmbr0
iface vmbr0 inet static
address 88.198.**.206
bridge_fd 0
bridge_ports enp0s31f6
bridge_stp off
broadcast 88.198.**.223
gateway 88.198.**.193
netmask 255.255.255.255
pointopoint 88.198.**.193
up ip route add 88.198.**.208/32 dev vmbr0
up ip route add 88.198.**.209/32 dev vmbr0

iface vmbr0 inet6 static
address 2a01:4f8:a0:**::1
gateway fe80::1
netmask 64

Did take some time to find that out.