Networking – Does a patch panel have to be terminated in the rack first?

If Cat6 Ethernet cables are connected to a wall-mounted patch panel, is there a way to move the patch panel into a rack (without cutting and rescheduling)?

Is a patch panel attached to the rack so you need to have your rack in place when you connect your cables to the patch panel and have the patch panel on the other side? Is there a way to change racks without having to reset everything?

With a patch panel, is there a good way to change racks or add a rack for the first time?

Networking – No option for wireless internet connection Ubuntu 18.04 LTS

I recently installed Ubuntu 18.04 on my MacBook Pro. It is the first time that I am using a Linux operating system. I have no way to connect to the wireless Internet, although I can use a wired connection with an Ethernet cable.

I tried to follow the steps in this video:

However, this did not resolve the problem.

In the comments, I found someone who managed to fix the problem using the following sequence of commands:

sudo apt update
sudo apt install git build-essential
git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git
cd backport-iwlwifi/
make defconfig-iwlwifi-public
sed -i 's/CPTCFG_IWLMVM_VENDOR_CMDS=y/# CPTCFG_IWLMVM_VENDOR_CMDS is not set/' .config
make -j4
sudo make install
sudo modprobe iwlwifi

However, this will still not fix the problem.

Networking – How can I create a peer-to-peer multiplayer game?

A good example of real peer-to-peer gameplay would be a real-time strategy game like Starcraft.

In a game with hundreds of units / projectiles in motion, it is impractical to repeatedly send unit positions / states to all other players over the network. Therefore, one solution is that all players run the (exactly the same) simulation synchronously.

When a player performs an action, the command (& # 39; move zergling to X, Y & # 39;) can be sent to all other players to be executed a fraction of a second later by all instances of the simulation.

In this situation, the game can continue if a player disconnects. Since no server / host is required to run the game, the remaining players can continue.

However, syncing the games isn't trivial. You have to use a fixed time step to update the game logic and be very careful when using and setting random number generators to ensure that the simulations don't diverge!

networking – network connection is cut during octave installation

I installed Octave on Ubuntu 19.10 based on the instructions available here
http://ubuntuhandbook.org/index.php/2019/07/gnu-octave-install-snap-ubuntu/

So afterwards

sudo snap install --beta octave
Download snap "octave" (10) from channel "beta"    

The download took place and it took a few hours and at some point the internet connection was cut. The machine was turned off for no more than 15 hours and there was no internet connection for 5-6 hours. I slept and when I woke up and then after a few hours when the internet is back I did
Slow octave recovery
I want to know what I can do in this situation. I know my connection is fast because other devices I have are high speed. Only this virtual machine under VMware hangs at a certain point. In this situation, what can I do to finish this and start the download or installation from anywhere and continue at full speed instead of doing a hanging installation?

I had bet suspend.disable="TRUE" in the VMX file for virtual machines https://kb.vmware.com/s/article/2056501
not locked so that I am sure that the gui icon for vmware is also grayed out for this reason
Ubuntu suspension disabled

Networking – How can I access the WAN IPs programmatically from a TP-Link multi-WAN router?

Our office uses a TP-Link TL-ER6020 multi-WAN router that supports up to 4 WAN connections, of which I use 2. For external access, I would like to register both IPs with AWS Route 53 DNS. Using another system from the office (like a Pi) does not work reliably because of methods like dig +short myip.opendns.com @resolver1.opendns.com reports one of the IP addresses based on the path that the traffic has taken.

When checking the admin user interface, there seems to be no evidence of an API. Open ports seem to be:

53
80
443
20002

I have activated and use SNMP snmpwalkI have some interesting variables, except the intranet IPs:

$ 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 rely on this exit to give me the external IPs aaa.aaa.aaa.38 and aaa.aaa.aaa.181 consequent? Or do I have to match up 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)}'

Are there any other options for this router?

Networking – Ubuntu 18.04.3 lags behind slow Internet speed

I'm not sure if that's the case.

It's just an observation: when I'm on a high-speed internet, everything runs smoothly, while it becomes very careless when I use a particular WiFi at low speed.

And I'm not talking about the web page loading speed (which should obviously be slower), but the whole system, including: animations, opening a new app, auto-completion, etc. In short, all processes that shouldn't depend on the internet.

Without this observation, it looks randomly whether it works all day without delays or if there is the same charge all day. Tried 19.10 and basically it always sucked.

Networking – Is it possible to set up a proxy for APT using the Ubiquity graphical desktop ISO installer?

According to the Ubiquity source code, the proxy settings are obtained from two sources:

  1. Pre-installation file (not our case)
  2. Proxy configuration of the current user (ie GSettings path org.gnome.system.proxy)

For Ubuntu MATE Desktop Installer you can use the following method:

  1. Boot the system in Try Ubuntu MATE without installation
  2. Start Network proxy Application of dash or with mate-network-properties
  3. Enter the required HTTP proxy:

    (E) Manual proxy configuration
    HTTP proxy: (192.168.12.34) Port: (8000)

    and click Conclude,

    Note: This step can be performed from the terminal using the following commands

    gsettings set org.gnome.system.proxy mode "'manual'"
    gsettings set org.gnome.system.proxy.http host "192.168.12.34"
    gsettings set org.gnome.system.proxy.http port "8000"
    
  4. Start the Ubiquity installer by clicking the icon Install Ubuntu MATE … Icon on the desktop.

  5. Proceed with the installation as usual and wait for it to finish.

As a result, you get this proxy saved in /etc/apt/apt.conf how mini.iso makes:

$ cat /etc/apt/apt.conf
Acquire::http::Proxy "http://192.168.12.34:8000";

For the more universal solution, it is recommended to remove this file and use a special avahi-based package sudo apt-get install squid-deb-proxy-client to access it using the hostname.


Note: This method may work for other Ubuntu variants, but I haven't tested it.

Networking – Is it sensible or logical to have a model where the transport layer is unreliable but the network layer is reliable?

Assume 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 are the buffers on the transport layer.
Assume there is a buffer overflow and packets are dropped. Nobody will retransmit these lost packets.

If I'm right, doesn't that contradict the telephony system?

Networking – Single download effectively disables Internet access for everyone else

I have dual link DSL internet, something around 24mb / 1mb. The problem I have is that no matter what I seem to be doing, every time a device on my network downloads something with near maximum bandwidth, it effectively does the rest of the network until the download is complete, rather than that What I would expect is a coincidence that my DSL router does some kind of load balancing. I connected a Nighthawk RAX120 WiFi router from the DSL modem, and even using the QoS function (and my previous TP-LINK AC7200-QoS didn't fix that either, so the Nighthawk doesn't seem to solve the problem) , Any suggestions?

Networking – TLS handshake for every transmission

I have a legacy application that uses the WinInet library to connect to the server. The connection is established via TLS 1.2. However, there is a strange behavior where my client does a TLS handshake for every send request, even though I am connecting to the same IP address and port. This is followed by the Wireshark acquisition, which is repeated with every transmission. What can cause this behavior?
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