Ubuntu – how to limit bandwidth / internet speed per second to each VPN client

I configured the IPsec VPN server using Libreswan on CentOS 7 and Ubuntu 18.04 at the same time. Now I want to limit the internet speed on each connection. I searched the internet and found Linux Traffic Control (TC) and IPTABLES can do that. But the two seem very complex to understand.

What have I tried so far?

I have tried many commands from TC a IPTABLES. I share some of them more clearly for myself.

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root tbf rate 50kbit burst 32kbit latency 400ms

I have tried to limit the speed of 50KB per second for all IP addresses separately, but this limits all of the Internet from the server.

sudo iptables --new-chain RATE-LIMIT
sudo iptables --append RATE-LIMIT --match hashlimit --hashlimit-mode srcip --hashlimit-upto 50/sec --hashlimit-burst 20 --hashlimit-name conn_rate_limit --jump ACCEPT
sudo iptables-save

Here I have tried to create a new group RATE-LIMIT to limit 50 KB per second to each client, but that doesn't work for me

I am new TC and IPTABLES and did not understand it well. Can you help me please?

Limit RDP user to one application

I want to restrict an RDP user to only one application so that each time the user connects to the server, he / she only has access to this application … | Read the rest of https://www.webhostingtalk.com/showthread.php?t=1802805&goto=newpost

unit – Limit swing limits 1 and 2 on the articulations of characters asymmetrically

I want to create a game object that looks like the creatures seen here. A CharacterJoint is perfect for me, but I can't find a way to limit the limits of swing 1 and swing 2 asymmetrically, which can be done easily for the torsional limit.

One approach I tried was to write a script that will rotate the body beforehand, then add the joint. It didn't work for me and I was wondering if there could be a simple way to do it that I miss. If there are none, I will add the script to my question.

8 – How can I limit the access to the scrolling text format in a paragraph?

I am trying to limit access to users to change the value of the drop down list in text format, but I can't seem to find the correct drop down list to change. Here is what I have so far, but it seems to disable access to the field itself and not the drop-down list in text format.

function hook_field_widget_WIDGET_TYPE_form_alter(&$element, &$form_state, $context) {
  if ($element('#paragraph_type') == 'my_paragraph_bundle') {
    $element('subform')('field_text_long')('widget')(0)('#format')('#access') = FALSE;

film – Does activating Digital ICE on my Epson Perfection V600 limit the scanning resolution?

I use an Epson Perfection V600 photo scanner to scan color negatives. The scanner supports Digital ICE, which uses infrared light to scan for dust and automatically correct images to remove dust artifacts. In addition, its maximum optical resolution is 6400 DPI.

I have noticed that when I have not activated Digital ICE, the scanner motor moves extremely slowly and delicately in 6400 DPI mode, so its stepper motors can capture a negative at this size. However, I also noticed that when I activate Digital ICE, the motor moves a little faster during scanning in visible light, as if it were a scanning at a lower resolution. (The engine noise clearly changes in height depending on its speed.)

After a few tests, I determined that with Digital ICE enabled, the maximum speed of movement of the scanner head during scanning in visible light is the same as for 3200 DPI, even with the scanner in 4800 mode or 6400 DPI. It only moves slower than this speed when Digital ICE is turned off. (Without this option, 4800 DPI and 6400 DPI seem clearly unique.)

Are images scanned with the 4800 or 6400 DPI settings when Digital ICE is interpolated from 3200 DPI? Or is the scanner capable of scanning at 6400 DPI without interpolation at a faster speed?

I would like an answer that objectively compares pixels on different scans using low-grain color film. (I only use the high PPP settings when scanning low grain films, for example Ektachrome, Ektar, etc. and don't mind with stocks like Gold, Superia, etc.)

unit – Rigid body in limit position

How can I limit the position of a rigid body, between two values ​​if I use this code:

public Vector3 dir;

Rigidbody rb;

void Awake()
    rb = GetComponent();

void FixedUpdate()
    rb.velocity = new Vector3(6f, 0f, 0f);

    rb.AddForce(dir * 1f, ForceMode.VelocityChange);

If I use Vector3.Clamp, the object will shake

How to publish Blogger, I mean Limit of the character and the images?

How to publish Blogger, I mean Limit of the character and the images?

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7 – How to limit the submission of forms per user per day and week?

The goal is very simple. I need a form to limit each user to 1 submission per day and 3 per week.

What I found:

Web form:
The "Form Settings" in the Web form has the "User submission limit" setting. This does not allow me to do more than one validation. I can't have both daily and weekly in the same form.

I found that people use the hook function on the node limit on Drupal 8. It can work on Drupal 7 Entityform but I don't know how to write this syntax.

It is possible to use the Rule module but I don't see any link with the validation of the time period.

st.statistics – Clarification on insanity, standard deviation and upper limit

I have a little doubt about the inequality of the mean absolute difference (crazy) and the standard deviation.
From "Upper and lower limits of sample standard deviation"I read the following relationship:
$$ MAD leq sigma leq frac {R} {2} $$ with
$$ MAD = frac { sum_ {i = 1} ^ {n} | x_i – bar {x} |} {n} $$
and $ sigma $ standard deviation, but after an example, the relationship is not true.
In my example, I have N multidimensional vectors instead of having unique values, after that I compute the classic formula on the standard deviation by considering the vectors.
From Popoviciu's inequality, I read the following relation:
$$ V (X) leq { frac {(x_ {max} -x_ {min}) ^ 2} {4}} $$
to express the upper limit of the variance.
Since I have dimension vectors $ d $ I write:
$$ sigma leq { sqrt { frac {d * (x_ {max} -x_ {min}) ^ 2} {4}}} $$
My question is:

  1. Can I write the last expression with d?
  2. Why the MAD value is not less than the
    standard deviation?

Thank you very much in advance.

optimization – Minimization limit value problem, using the first variation

Consider the minimization problem $$ min { int _ {- 1} ^ 1 ( frac {1} {2} (u & # 39; & # 39;) ^ 2-fu)
> dx | u (-1) = u (1) = u & # 39; (1) = u & # 39; (- 1) = 0 } $$
Determine the solution of
limit value problem which results from the conditions necessary for
a minimum if $ f $ is constant.

So, first, let's determine the limit value problem, I thought that a necessary condition was that the first variation be $ 0 $ for a minimum. It would also lead

$$ frac {d} {d epsilon} | _ { epsilon = 0} int _ {- 1} ^ 1 ( frac {1} {2} (u & # 39; & # 39; + epsilon varphi & # 39; & # 39;) ^ 2-fu-f epsilon varphi) dx = 0 $$
With $ u (-1) = u (1) = u & # 39; (1) = u & # 39; (- 1) = $ 0

Which also led me $$ int _ {- 1} ^ 1 (u & # 39; & # 39; varphi & # 39; & # 39; & fu) dx = 0 $$

I tried to solve this problem with the product rule for integration, but it didn't really help me.

Have I solved the limit value problem correctly? If yes, how should I proceed? How else to find the right one?

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