Networks: bridge problems within a small network (slaves cannot share the master's Internet connection)

I have a central machine with Ubuntu 18.04 LTS Server installed that is connected to the Internet through a static IP address, and I created a subnet with several (6) other computers (also with Ubuntu 18.04 LTS) connected through a PCI network card . Everyone should share the teacher's Internet connection, which is assigned through a static IP. At this stage, my subnet is working correctly, however, I cannot share the teacher's Internet connection, despite my various attempts. Any help will be greatly appreciated. Here are some more details.

In the master, I configured a bridge using the following netplan yaml:

 network:
  version: 2
  renderer: networkd
  ethernets:
    enp4s0:
      addresses: ( xxx.xxx.xxx.200/24 )
      gateway4: xxx.xxx.xxx.xxx
      nameservers:
        addresses:
          - "xxx.xx.xxx.xx"
          - "xxx.xx.xxx.xx"
    switchports:
      match:
        name: enp(4-8)*
  bridges:
    br0:
      interfaces: (switchports)
      addresses: (10.28.11.1/24)

Each "slave" machine is asking for a static address using:

network:
  version: 2
  renderer: networkd
  ethernets:
          enp4s0:
                  addresses: ( 10.28.11.24/24 )
                  gateway4: 10.28.11.1
                  nameservers:
                          addresses:
                                  - xxx.xx.xxx.9
                                  - xxx.xx.xxx.10

I can connect correctly from the master to the slave using ssh and its static IP and I can connect between the slaves in the network "10.28.11" (random number that I chose to avoid conflicts within my organization).

However, slaves do not have access to the internet.

This is my ifconfig exit in the teacher:

br0: flags=4163  mtu 1500
        inet 10.28.11.1  netmask 255.255.255.0  broadcast 10.28.11.255
        inet6 fe80::44d5:adff:feff:26fd  prefixlen 64  scopeid 0x20
        ether 46:d5:ad:ff:26:fd  txqueuelen 1000  (Ethernet)
        RX packets 4467  bytes 560333 (560.3 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1835  bytes 186596 (186.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp4s0: flags=4163  mtu 1500
        inet xxx.xxx.xxx.200  netmask 255.255.255.0  broadcast xxx.xxx.xxx.255
        inet6 fe80::7285:c2ff:fedf:cc9b  prefixlen 64  scopeid 0x20
        ether 70:85:c2:df:cc:9b  txqueuelen 1000  (Ethernet)
        RX packets 34809  bytes 2362331 (2.3 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5721  bytes 791301 (791.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp7s0f0: flags=4163  mtu 1500
        ether 00:26:55:de:ec:fd  txqueuelen 1000  (Ethernet)
        RX packets 3321  bytes 375922 (375.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2345  bytes 381403 (381.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 59  memory 0xfc820000-fc840000  

enp7s0f1: flags=4163  mtu 1500
        ether 00:26:55:de:ec:fc  txqueuelen 1000  (Ethernet)
        RX packets 298  bytes 36481 (36.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 996  bytes 245397 (245.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 30  memory 0xfc800000-fc820000  

enp8s0f0: flags=4163  mtu 1500
        ether 00:26:55:de:ec:ff  txqueuelen 1000  (Ethernet)
        RX packets 449  bytes 116670 (116.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 550  bytes 122340 (122.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 33  memory 0xfc620000-fc640000  

enp8s0f1: flags=4163  mtu 1500
        ether 00:26:55:de:ec:fe  txqueuelen 1000  (Ethernet)
        RX packets 447  bytes 116748 (116.7 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 559  bytes 122916 (122.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 28  memory 0xfc600000-fc620000  

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 91  bytes 6940 (6.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 91  bytes 6940 (6.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

This is my brctl show exit in the teacher:

bridge name bridge id       STP enabled interfaces
br0     8000.46d5adff26fd   no      enp7s0f0
                            enp7s0f1
                            enp8s0f0
                            enp8s0f1

networks – How to configure obfs4 bridge in torrc

Tor your block in my country.

In Android I use Orbot and obfs4, it connects successfully.

In Tor Browser, I set up obfs4 in the wizard and it connects successfully.

But I can't configure obfs4 in torrc. I want to connect apps to socks5 like Telegram and Chrome.

I set this up but it doesn't work.obfs4proxy it's installed.

BridgeRelay 1
ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy
Bridge obfs4 107.174.52.106:443 C123A28F1EFCEA6F0ZC061637B0AB16774466ACC

I install Tor from here

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Linux networks: Do I need a bridge adapter for my KVM guest?

Trying to achieve speed quickly in KVM and in the creation of guest machines. On my test machine I built a KVM guest easily, and once I realized that I had to use the br0 adapter and not the virbr0 I had (which received an IP 192.168.xx) everything worked very well since the br0 was Obtaining the correct IP Address through DHCP It seemed.

Now I need to do this in my production machine that I did not build from scratch and I have a guest in it. I can not say what that guest is using as a virtio, what's his name? although if I configure myself in the host production machine, I see:

eth0 Encapsulated link: Ethernet HWaddr 00: 25: 90: FC: A2: 84
inet addr: 10.50.1.46 Bcast: 10.50.1.255 Mask: 255.255.255.0
inet6 addr: fe80 :: 225: 90ff: fefc: a284 / 64 Scope: Link
UP BROADCAST RUNNING MULTICAST MTU: 1500 Metric: 1
RX packages: 56552318 errors: 0 discarded: 0 overshoots: 9 frames: 0
TX packages: 2422904 errors: 0 discarded: 0 overshoot: 0 carrier: 0
collisions: 0 txqueuelen: 1000
Bytes RX: 17503221592 (16.3 GiB) TX bytes: 1534669733 (1.4 GiB)
Memory: fb320000-fb33ffff

lo Link encap: Local Loopback
inet addr: 127.0.0.1 Mask: 255.0.0.0
inet6 addr: :: 1/128 Scope: Host
UP LOOPBACK RUNNING MTU: 65536 Metric: 1
RX packages: 518348 errors: 0 discarded: 0 overflows: 0 frames: 0
TX packages: 518348 errors: 0 discarded: 0 overshoots: 0 carrier: 0
collisions: 0 txqueuelen: 0
Bytes RX: 1399850374 (1.3 GiB) Bytes TX: 1399850374 (1.3 GiB)

virbr0 Encapsulated link: Ethernet HWaddr 52: 54: 00: 2A: 3C: 56
inet addr: 192.168.122.1 Bcast: 192.168.122.255 Mask: 255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU: 1500 Metric: 1
RX packages: 0 errors: 0 discarded: 0 overflows: 0 frame: 0
TX packages: 0 errors: 0 discarded: 0 overflows: 0 transporter: 0
collisions: 0 txqueuelen: 0
RX bytes: 0 (0.0 b) TX bytes: 0 (0.0 b)

This guest needs 10.50 as the eth0 network has done. There is no bridge and virbr0 has the damn 192.168.xx that does not work.

Then, when I create my guest virtual machine in this production box … this is the line I intend to use:

virt-install --virt-type = kvm --name kosmos-icc --ram 8000 --os-variant = rhel6.6.0 --cdrom = / root / SL-7-DVD-x86_64-2015-04-07- 7.1.iso --network = bridge = virbr0, model = virtio - graphics vnc --disk path = / var / lib / libvirt / images / slkosmosicc.qcow2, size = 8, bus = virtio, format = qcow2 --noautoconsole

So for the – network = bridge = virbr0 I can say simply

--network = eth0 ??

Will this block the other guest who runs in the box? I do not want to mess with all that (as a side note, I have no idea how to configure it on the network, and if I charge virt-manager does not have a NIC hardware for that guest that is already on the machine, which I find strange ?)

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networks – virsh can not configure the bridge Operation not allowed

I'm trying to enable the default libvirt network to be able to create a virtual machine. However, when I try to start the default network, this happens:

sudo virsh -c qemu: /// default net-start system
error: Error when starting the default network
error: bridge can not be established virbr0 forward_delay: operation not allowed

with red-list --all You can see that it is not running:
sudo virsh -c qemu: /// system net-list --all

Name State Autostart Persistent

-------------------------------------------------- --------

default inactive yes yes

Is there another way to start the network. I do not need to see other devices on the network, I just need access to the Internet.

Is the problem because it does not exist? If I do it ip addr show does not appear

1: lo: mtu 65536 qdisc noqueue status 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 reach host what
valid_lft always preferred_lft always
inet6 :: 1/128 scope host
valid_lft always preferred_lft always
2: venet0: mtu 1500 qdisc noqueue status Unknown default group
link / void
inet 127.0.0.1/32 reach host venet0
valid_lft always preferred_lft always
inet 206 .---. 166 .--- / 32 brd 206. --- .---. 96 global scope venet0: 0
valid_lft always preferred_lft always
inet6 :: 2/128 global reach
valid_lft always preferred_lft always

Lipo Battery With Bridge H L298N

I have a cart design using the Arduino and a L298N bridge. I wonder if he has to feed the L298N directly with a lipo 3s battery. Without the battery spoiling or consuming too much, it is not possible to reuse it.

java – ODBC Bridge Connector from Servelet Using Glassfish

Hello At this moment I would like to consult about an error that I have not yet managed to understand.
I currently have a database (.dbf) in a shared folder on the Server
But the Servelet fails to connect to the database by the following error:

[Microsoft][Controlador ODBC dBase] '(unknown)' is not a valid path. Make sure that the path is written correctly and that it is connected to the server where the file is located.

However using the same code but from a java application it connects without problems. I've tried different connection strings without success.

More Down I Facilitate the Code with Which I Attempt to Connect to the Shared Folder.

try {
  Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
  string Connection = "jdbc: odbc: Driver = {Microsoft dBASE Driver (* .dbf)}; DefaultDir = Z: ";

  log.getLogger (). info ("[" + idLog + "] URL Connection: "+ chain Connection);
  conn = DriverManager.getConnection (stringConnection);
  log.getLogger (). info ("[" + idLog + "] Accepted Connection! ");
} catch (Exception ex) {
  log.getLogger (). info ("[" + idLog + "] Exception: "+ ex.getMessage ());
}

The Connection Chains I tried to use.

jdbc: odbc: Driver = {Microsoft dBASE Driver (* .dbf)}; DefaultDir = Z: 
jdbc: odbc: Driver = {Microsoft Visual FoxPro Driver}; SourceType = DBF; SourceDB = Z: ; Exclusive = No;

In this case Unit Z: It would be a Network unit created from that Shared folder.

With this Driver the connection is Successful but at the moment of doing a select it tells me that the file does not exist.

jdbc: odbc: Driver = {Microsoft Visual FoxPro Driver}; SourceType = DBF; SourceDB = Z: ; Exclusive = No;

Another thing I would like to add is that if the route is local, for example C: it works without problems.
I hope you can help me solve this dilemma.