Questions[network-bridge](ubuntu)

I am on a Ubuntu 22.04.5 LTS server. The network ports are already trunked. I am trying to setup a virtual bridge with a bond as a slave using netplan on a VLAN 202. Below is not working:

$ cat /etc/netplan/00-bond-bridge-config.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eno3:
      dhcp4: false
    eno4:
      dhcp4: false
  bonds:
    bond0:
      dhcp4: false
      interfaces: [eno3, eno4]
      parameters:
        mode: active-backup
        mii-monitor-interval: 100
  vlans:
    bond0.202:
        id: 202
        link: bond0
  bridges:
    br0:
      dhcp4: false
      interfaces: [bond0.202]
      addresses: [192.168.1.2/24]
      routes:
        - to: default
          via: 192.168.1.1
      nameservers:
        addresses: [1.1.1.1, 8.8.8.8]
        search: []

I am unable to ping my Ubuntu host. What do I have wrong in my yaml file?

Accessing to some repository and website for sanctioned countries always is a big challenge for developers. I try to find the best and easiest way to proxy entire system in Ubuntu with Tor, privoxy and bridge.

I tried creating a network bridge through Virtual Machine Manager for KVM. Now my Ubuntu network connection depends on my Windows KVM being booted.

Since creating this bridge when Ubuntu is booted there is no network connectivity at all, no network icon at the top right corner of the screen, no web pages will load, and I am even unable to access any of my local servers and other computers on the network.

The process to get network connectivity back after a reboot is to open VMM, go to network connections and enable the bridge that I created (it's set to start on boot but it doesn't). However just enabling the bridge isn't enough, still nothing works. It's not until my Windows 10 VM is fully booted that suddenly I have full network connectivity again, and everything works fine.

I don’t know how that happened. But I need to get my Ubuntu networking set back to normal. Then I need to figure out how to properly bridge Ubuntu and KVM

I set up my first ubuntu server recently and I am struggeling with netplan.

As I need a Windows to run one service which isnt available on linux, I try to set up KVM.

The server has serveral static ips used for different services or docker containers running services, so my netplan config looks like this:

 network:
 version: 2
 renderer: networkd
 ethernets:
   enp30s0:
     dhcp4: no
     addresses: [xxx.xxx.xxx.100/24, xxx.xxx.xxx.102/24, xxx.xxx.xxx.105/24, ...]
     gateway4: xxx.xxx.xxx.1
     nameservers:
       addresses: [xxx.xxx.xxx.1]

Now it seems as I need to create a network bridge to make it available for the guest machine, but I was unable to find a solution to do so only for 1 adress.

Is there any way to achieve this, or am I making a conceptual mistake here?

Any help would be highly appreciated! Thank you.

I wanted to use my desktop with a wired ethernet connection (eth0) to operate my "TP-LINK TL-WN722N" USB Wifi Adapter (wlan0) as a non-adhoc (infrastructure mode) access point for my Android to connect to.

After MUCH searching, I finally found a method (spread across many websites) that does most of what I need...

Dependencies:

 hostapd
 bridge-utils

I modified "/etc/network/interfaces"

sudo gedit /etc/network/interfaces

to contain:

# This file describes the network interfaces available on your system
# and how to activate them.

auto lo br0
iface lo inet loopback

allow-hotplug eth0
iface eth0 inet manual

allow-hotplug wlan0
iface wlan0 inet manual

# Bridge setup

# for dhcp address
iface br0 inet dhcp
bridge_ports eth0 wlan0

# for static ip
# iface br0 inet static
# bridge_ports eth0 wlan0
# adapt with your network settings
# address 192.168.1.250
# netmask 255.255.255.0
# network 192.168.1.0
# broadcast 192.168.1.255
# gateway 192.168.1.1
# dns-* options are implemented by the resolvconf package, if installed
# dns-nameservers 192.168.1.1
# dns-search localdomain

### Reference ###

# Creating a Wireless Access Point with Debian Linux « Agent Oss (October 31, 2011)
# https://agentoss.wordpress.com/2011/10/31/creating-a-wireless-access-point-with-debian-linux/

My "/etc/hostapd/hostapd.conf" (which I somehow managed to put together myself)

sudo gedit /etc/hostapd/hostapd.conf

contains:

 ### Guts ###

 interface=wlan0
 bridge=br0
 driver=nl80211

 ### General ###

 ssid=____________________
 hw_mode=g
 channel=1

 ### Security ###

 macaddr_acl=0
 auth_algs=1
 ignore_broadcast_ssid=0     ## 0 visible # 1 hidden ##
 wpa=2
 wpa_passphrase=____________________
 wpa_key_mgmt=WPA-PSK
 wpa_pairwise=TKIP
 rsn_pairwise=CCMP

 ### Reference ###

 ## Created Tuesday, February 14, 2012 ## Ubuntu 11.10/12.04 ##

 # Hostapd Linux Documentation Page
 # http://linuxwireless.org/en/users/Documentation/hostapd

 # Creating a Network Bridge on Ubuntu (January 16th, 2011)
 # http://webserver.linuxportal.nl/?p=422

(I've edited out the security bits for this post)

All of that allows me to open up a Terminal and execute:

 sudo hostapd -B /etc/hostapd/hostapd.conf

to have a functioning access point that my Android and all other WiFi devices can connect to.

Aside from sharing this method with others since info for this setup is so sparse; there are three problems that would be nice to fix:

1. This configuration deactivates network manager and all of its functions. When you click it, it gives a "device not managed" message. (not essential, but a bit annoying to me)
2. This method can struggle with IP addresses from time to time.
3. I must use a terminal to turn on Wifi. (Ok for me, but not family friendly). I figured out how to make a launcher using gksu and a simple script if anyone needs one...

4. (Why can't network manager do this out-of-the-box??)

Thanks in advance! I hope all of this can help someone else; I've never written a tutorial before and know virtually nothing about networking...

Perhaps related to network bridge - without destroying network manager (among others).

Tested using Ubuntu 11.10, 12.04.