networks: join two interfaces together, forward traffic

I am currently trying to create a configuration that forwards traffic through an Ubuntu server to a switch, which will then connect several servers (each assigned to an individual IP) The Ubuntu server has a PCI NIC and a built-in port board.

The PCI NIC (enp0s25) is connected to the outside world, then it must exit the integrated port (enp1s0) to the switch.

I was reading on the network bridges, but I can't seem to understand how to join two interfaces together that way. The reason for this server is to act as a firewall on the switch (run things with XDP / eBPF for advanced filtering).

My current netplan configuration looks like this:

network:
    version: 2
ethernets:
    enp1s0:
        dhcp4: true
    enp0s25:
        dhcp4: true
bridges:
    br0:
        interfaces: (enp1s0)
        dhcp4: true
        optional: true

This is obviously not working. I am quite new to networks, so I am interested in learning all this.

wireless networks: interference between symbols versus digital modulation

so I'm a little confused here after my conference today. My teacher started by explaining what interference between symbols. and finished the conference talking about the different types of digital modulations. But now I'm confused with how they join. or your two different things?

Is ISI more about sending digital signals on a cable? Why ISI comes into play when doing say QPSK? I thought that the symbol signal sent in QPSK is just a sign of sin. or use this ISI?

someone please help because I am very confused … thanks in advance!

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networks: how can I programmatically obtain the WAN IPs of a multi-WAN TP-Link router?

Our office uses a TP-Link TL-ER6020 multi-WAN router, which supports up to 4 WAN connections, of which I am using 2. To access from outside, I would like to register both IPs with AWS Route 53 DNS. Using another system from within the office (such as a Pi) does not work reliably, since methods such as dig +short myip.opendns.com @resolver1.opendns.com inform any of the IPs according to the route the traffic took.

When inspecting the administrator user interface, there seems to be no indication of an API. The open ports seem to be:

53
80
443
20002

I have enabled SNMP, and using snmpwalk, I obtained some variables of interest, excluding the IP of the intranet:

$ snmpwalk -c public -v 2c 192.168.1.1 iso.3.6.1.2.1.4.22.1.3 | grep -vF 192.168.1.
iso.3.6.1.2.1.4.22.1.3.15.aaa.aaa.aaa.1 = IpAddress: aaa.aaa.aaa.1
iso.3.6.1.2.1.4.22.1.3.15.aaa.aaa.aaa.38 = IpAddress: aaa.aaa.aaa.38
iso.3.6.1.2.1.4.22.1.3.16.bbb.bbb.bbb.1 = IpAddress: bbb.bbb.bbb.1
iso.3.6.1.2.1.4.22.1.3.16.bbb.bbb.bbb.181 = IpAddress: bbb.bbb.bbb.181

Can I trust this output to obtain external IPs? aaa.aaa.aaa.38 Y aaa.aaa.aaa.181 consequently? Or do I need to match iso.3.6.1.2.1.4.22.1.2 (MAC Address) and iso.3.6.1.2.1.4.22.1.3 (IP) to be sure (what could I do with awk or Python)? Something like:

snmpwalk -c public -v 2c 192.168.1.1 iso.3.6.1.2.1.4.22.1 | awk -v OFS=. '/Hex-STRING/ && /XX XX XX XX XX X(YY)/ {split ($1, a, "."); print a(12), a(13), a(14), a(15)}'

Is there any other option with this router?

networks – Ethernet is disconnected frequently and intermittently for a specific computer and a specific wall socket

I have a very specific problem that involves a specific desktop computer and a specific ethernet wall connector. I have already tried several different approaches to solve the problem, so read this post carefully as I describe them.

I have a desktop computer (specifications at the end of this post) connected to an ethernet wall connector in my condo. A couple of days ago, I noticed that the Internet was periodically cutting off for a short period of time. This was first noticed as a loss of video quality during transmission, but it also manifests itself as longer initial connection times when the computer is first turned on, periodic changes in the network status icon and disconnection of Online games

Of course, my first approach was to try changing the Ethernet cable for a different one. This did not correct the problem.

Then, I made sure that all of my unit's Wi-Fi connections, such as those on my mobile devices, function normally. There are no problems with the WiFi.

Then, I tried to connect my work laptop to the same connector that the desktop machine was using. I disabled WiFi connectivity to the laptop, to prevent it from changing, if it loses the signal. However, there were no problems with using the laptop on the same connector that the desktop machine was using.

I have a second wall socket in the area of ​​my home office, so I tried to take the mechanized desk there and plug it into that socket. Here it is where it gets interesting. The desktop machine had no problems executing that connector. In fact, I was able to play in the online game for a significant period of time, without interruption. Okay, the monitor in my home office area is not HD, so download bandwidth requirements may have been reduced. However, they would still have been important, and when it was connected to the first connector, it still had problems, even when there were no active user programs.

I tried to leave the laptop running on the first connector and the desktop running on the second connector, to see if the Windows Event Viewer detected disconnections, but none was received on any of the machines.

Finally, given the possibility that the problem was a power fluctuation, I tried to plug the laptop into the first connector and run the power from the same power bar as the desktop computer, with the mechanized desk and its peripherals (speakers , external sound amplifier, monitor) all running at the same time. Even so, the Event Viewer did not detect connectivity problems with the laptop using the first connector, nor did it change to battery power.

In summary, this problem ONLY occurs with the desktop computer and ONLY It happens with that specific jack.

This puts me in a kind of Catch-22. I can't take the desk to the store (it's still under warranty) and say something is wrong with the ethernet card because they will point out that it works fine on another connector. I can't call my ISP because they will point out that the WiFi is working, as well as the first connector with a laptop and the second connector with both computers. I can't make my building see it because they will point out that the connector works well with the laptop.

Any suggestions will be appreciated. The specifications follow.

Desktop

Aeon 1080 Gaming Tower, Intel Core i7-7700 3.6GHz Quad-Core, 8GB DDR4, 1 SSD 240GB and 1 HDD 1TB, RealTek PCIe GbE Family Controller, Windows 10 Home 64 Bit

Laptop

Lenovo ThinkPad, Intel Core i5-8250U 1.60GHz, 8 GB of RAM, 256GB SSD, RealTek PCIe GbE Family Controller, Windows 10 Pro 64 Bit

networks: is it practical or logical to have a model in which the transport layer is not reliable but the network layer is reliable?

Assuming that the transport layer provides unreliable services to the application layer and the network layer provides reliable services to the transport layer.

I think this model will fail. An example is the tampons in the transport layer.
Assume there is a buffer overflow and packets are discarded. No one will retransmit these lost packets.

If I'm right, isn't it in contradiction with the telephone system?

networks: how can a single virtual NIC adapter access two networks simultaneously in Vmware?

=================================================== =======================

ONE host notebook:

win10, wifi internet links, ethernet internet links.

Vmware, virtual debian 9.6, default virtual NIC adapter (only one), bridge mode.

By executing "ip a", I can see that the debian has an ethernet IP, you can access the internet using the win10 ethernet links. You can also ping the wifi IP address of the win10.

=================================================== =======================

Host of notebook two:

win10, wifi internet links, ethernet links to another debian 9.6 PC installation (Call it Debian_PC).

Vmware, virtual debian 9.6, default virtual NIC adapter (only one), bridge mode.

By running "ip a", I can see that the virtual debian has a Wi-Fi IP, you can access the Internet using win10's Wi-Fi links. You can also ping the Debian_PC Ethernet IP address. In addition, virtual debian can SSH / SCP to Debian_PC.
BUT when I want to mount a virtual Debian folder on Debian_PC, I'm surprised: what is the virtual Debian Ethernet IP?

=================================================== =======================

Then I searched Google for this:

Change the network configuration in VMnet0 bridge Last updated 05/09/2018 2 Add to MyLibrary <Ask new question
By default, VMnet0 is configured to use automatic bridge mode and is configured to connect to all active network adapters on the host system. You can use the virtual network editor to change VMnet0 to connect to a specific host network adapter, or restrict the host network adapters to which VMnet0 automatically connects. The changes you make affect all virtual machines that use bridged networks on the host system. For example, you might want to change VMnet0 to connect to a specific host network adapter, or to automatically bridge it as a subset of the available host network adapters, so that a host network adapter is available to create a second bridged network.

And more :
Automatic Workstation Pro automatically connects the virtual network with all active physical network adapters in the host system. The choice of which adapter to use is arbitrary.

=================================================== =======================

So, the question is:

Debian virtual only gets a virtual NIC adapter, how can
access two networks simultaneously?

How to get the other IP address? (In the ONE notebook, how to get
The Wi-Fi IP of Debian Vritual? And in the DOS notebook, how to get the
Debian Vritual Ethernet IP? )

networks: brave browser synchronization over LAN does not respond

I have asked this on the Brave site but there is no answer there.

I am testing the Brave browser and I have problems with the synchronization function that, as I understand it, synchronizes the configuration and references of all the devices connected to the synchronization chain.

However this is not working.

For this attempt, I use two machines connected to a small LAN. These machines communicate through SSH, NFS, telnet, etc. so that there are no communication problems at the top.

  • On the first machine I create the chain and receive a passcode;
  • The dialog box turns on "Searching for device", it seems stuck there after half an hour.
  • On the second machine, I open the synchronization dialog box and paste the key into it. The "Verify" button is clicked, but there is no other answer.

graphics and networks: what's wrong with GraphLayout?

I suspect that this is literally just a mistake in Mathematica. Here is the same graph embedded with different options for GraphLayout:

edges =
{
UndirectedEdge[1, 2],
UndirectedEdge[2, 3],
UndirectedEdge[3, 5],
UndirectedEdge[4, 7],
UndirectedEdge[4, 8],
UndirectedEdge[5, 6],
UndirectedEdge[5, 7]
};
{Graph[edges, GraphLayout -> "GridEmbedding", ImageSize -> Medium], 
 Graph[edges, GraphLayout -> "LayeredEmbedding", ImageSize -> Medium]}

The output is shown below.

Exit

The two graphics clearly have a different connectivity. What about this?

networks: limit a program to use only WiFi network cards

I have an Ethernet card and a WiFi card in my standard Windows 2016 server.
My server uses the Ethernet card to access the Internet and the WiFi card is used to access a VPN network (for remote location).

Our office has seven locations. Five locations on the same network that can be accessed using an Ethernet card (different IP and gateway) and two locations using a WiFi card (different IP and gateway) that are based on VPN.

Now when I run an application (Assistance Management System – Bio Metric Device Software) to synchronize data from remote locations. This software synchronizes data from the Ethernet card but not from the WiFi card for VPN locations.

I set the metric value of the Ethernet 50 card and the metric value of the WiFi 5 card so that the server gives priority to the WiFi network.

But this is not working. I want to know that there is some way to limit a program to access a specific network card for connectivity.