No internet connection

G

gernazdasch

New Member
Jun 9, 2022
25
1
3
Hello.

I installed for the first time Proxmox, i am trying to connect a windows 10 VM to the internet.

My network :
Screenshot 2022-06-10 at 19-43-09 prne-r051-235cl - Proxmox Virtual Environment.png

My VM config :
Screenshot 2022-06-10 at 19-49-45 prne-r051-235cl - Proxmox Virtual Environment.png

And no internet :
Screenshot 2022-06-10 at 19-50-18 prne-r051-235cl - Proxmox Virtual Environment.png

What is wrong? I connect via web admin panel.
 
Hi,

can you post your /etc/network/interfaces and the config of the Windows vm qm config <vmid>?
 
  • Like
Reactions: gernazdasch
cat /etc/network/interfaces
Code: 
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

auto vlan1919
iface vlan1919 inet static
        address xxx.xxx.xxx.xxx/28
        gateway xxx.xxx.xxx.xxx
        bridge_ports bond0.1919
        dns-nameservers yyy.yyy.yyy.yyy zzz.zzz.zzz.zzz

auto eth1
iface eth1 inet manual

auto bond0
iface bond0 inet manual
        bond-slaves eth0 eth1
        bond-miimon 100
        bond-mode 802.3ad
        bond-lacp-rate fast
        bond-xmit_hash_policy layer3+4

iface bond0.1919 inet manual

iface bond0.1920 inet manual

auto vlan1920
iface vlan1920 inet static
        address 10.22.121.11/24
        bridge_ports bond0.1920

auto vmbr0
iface vmbr0 inet static
        address 192.168.10.1/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.10.101
        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 '192.168.10.0/24' -o vlan1919 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.10.0/24' -o vlan1919 -j MASQUERADE

qm config 101
Code: 
boot: order=ide0;ide2;net0
cores: 4
ide0: local:101/vm-101-disk-0.qcow2,size=100G
ide2: local:iso/virtio-win.iso,media=cdrom,size=519172K
machine: pc-i440fx-5.2
memory: 4096
name: win1
net0: virtio=44:D9:7A:9B:E2:30,bridge=vmbr1
numa: 0
ostype: win10
scsihw: virtio-scsi-pci
smbios1: uuid=1418d177-a85b-3483-bf3b-9e057d9e9f0d
sockets: 1
vga: std
vmgenid: 96f3c372-db9d-4dcd-8e4b-2b52e0acc92e


I have managed to make it work on a test Ubuntu 20.4

Code: 
root@lin1:~# ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0@if12: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 1a:dc:57:5e:7b:bc brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.10.15/24 brd 192.168.10.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::18dc:57ff:fe5e:7bbc/64 scope link
       valid_lft forever preferred_lft forever
root@lin1:~# ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=59 time=0.689 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=59 time=0.760 ms
^C
--- 1.1.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1016ms
rtt min/avg/max/mdev = 0.689/0.724/0.760/0.035 ms
root@lin1:~#

But on windows can't get it right. I also installed the drivers like in the example here : https://unihost.com/help/settings-nat-proxmox5/

Also i might ask, doing this NAT network, i will have full 1Gbps speed? I am worried that running a virtual OS might not have same bandwidth, even though it is a Type1 hypervisor.

Thank you.
 
Last edited:
Hi

this looks a bit off to me. You have configured 192.168.10.1 as your gateway. But I don't think the VM can see that IP because you added vmbr1 to your VM.

Code: 
auto vmbr0
iface vmbr0 inet static
        address 192.168.10.1/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.10.101
        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 '192.168.10.0/24' -o vlan1919 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.10.0/24' -o vlan1919 -j MASQUERADE


If you don't need two interfaces in the same network I would just do this in /etc/network/interfaces:

Code: 
auto vmbr0
iface vmbr0 inet static
        address 192.168.10.1/24
        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 '192.168.10.0/24' -o vlan1919 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.10.0/24' -o vlan1919 -j MASQUERADE

and then edit the configuration of the VM and change the network bridge to vmbr0.
 
those are my current interfaces right now and they are working, i have internet :

Code: 
auto vmbr0
iface vmbr0 inet static
        address 192.168.10.1/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 192.168.10.101/24
        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 '192.168.10.0/24' -o vlan1919 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.10.0/24' -o vlan1919 -j MASQUERADE

auto vmbr2
iface vmbr2 inet static
        address 10.10.10.100/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        post-up iptables -t nat -A POSTROUTING -s '10.10.10.0/24' -o vlan1919 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o vlan1919 -j MASQUERADE

When i use use vmbr0 network I set the IP:192.168.10.16 MASK:255.255.255.0 GATEWAY:192.168.10.101
I dont understand why it works because I don't have a POSTROUTING rule on firewall
Also i dont understand why is working with vmbr1's gateway. It is also working with GATEWAY:192.168.10.101
Why is working like this??

When i use use vmbr1 network i set the IP:192.168.10.16 MASK:255.255.255.0 GATEWAY:192.168.10.101

When i use vmbr2 network I set the IP:10.10.10.16 MASK:10.10.10.255 GATEWAY:10.10.10.16

Thank you for the responses.
 
Last edited:
Why do you need to interfaces in the same network (vmbr0, vmbr1)?
 
Just testing, don't need them. I only need 2 interfaces, different networks.

But the question remains, how they even work? Shouldn't be in conflict ?
 
Code: 
ip route
default via MY_MAIN_IP dev vlan1919 proto kernel onlink
10.10.10.0/24 dev vmbr2 proto kernel scope link src 10.10.10.100 linkdown
10.22.121.0/24 dev vlan1920 proto kernel scope link src 10.22.121.11
MY_MAIN_IP/28 dev vlan1919 proto kernel scope link src MY_MAIN_IP
192.168.10.0/24 dev vmbr0 proto kernel scope link src 192.168.10.1
192.168.10.0/24 dev vmbr1 proto kernel scope link src 192.168.10.101
 
You must log in or register to reply here.
Top Bottom