wireless networking – Monitoring connection to wifi router

I want to figure out where I should place my wifi router. Is there an app that monitors desktop to wifi connection quality in real time so I can just walk around/hold it up/down near a wall etc to see where it is optimal?

I don’t want to run a speed test, I am not trying to measure the internet connection, I am interested in the connection to the router itself.

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Operating systems: ( Windows 2008 server datacenter R2 and Windows 2012 server datacenter R2 )

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HostSailor has established itself as a trusted provider of high-quality VPS Hosting, Shared Hosting, Dedicated servers, Domains, and SSL Certificates with top-notch support and impeccable reputation and also offers some of the most competitive pricing, without sacrificing the quality of the products and services.
HostSailor is based in Dubai, UAE, and the services are physically located in the Netherlands, all servers are HP and 100% owned, we do not resell any of our VPS services.
Operating systems: ( CentOS, Debian, Fedora, Scientific, Suse, and Ubuntu ) If we don’t have it, we can install it for you! or you can request us to mount your own image.
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View attachment 6222
—————————————

VPS :

—————————————

15% OFF Recurring, Monthly ===>> Coupon: JUN21VPS
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20% OFF Recurring, Quarterly ===>> Coupon: JUN4VPS2021
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25% OFF Recurring, Semi-Annually ===>> Coupon: JUN25VPS
—————————————————————-
30% OFF Recurring, Annually ===>> Coupon: ANN2021JUN
—————————————————————-
20% OFF Recurring , Mini Sailor Only “Annually” ===>> Coupon: MINI2021JUN
—————————————————————-

Linux SSD OpenVZ:

Sailor:

512 Guaranteed RAM
512 VSwap RAM
15 GB SSD
1 Core
1 Gbit Port
512 GB Bandwidth
1 IPV4 address
Unlimited IPv6
SolusVM Control Panel
Hosted in the Netherlands

Sailor Monthly: 4.24$
Sailor Quarterly: 11.97$
Sailor Semi-Annually: 22.45$
Sailor Annually: 41.91$

To check all our SSD OpenVZ plans or place an order go HERE

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

Linux XEN & KVM:

Sailor:

512 Guaranteed RAM
512 SWAP
15 GB HDD
2 Cores
1 Gbit Port
512 GB Bandwidth
1 IPV4 address
Unlimited IPv6
SolusVM Control Panel
Hosted in Netherlands ( KVM & XEN )
Hosted in Romania ( KVM )
Sailor Monthly: 3.39$
Sailor Quarterly: 9.57$
Sailor Semi-Annually: 17.95$
Sailor Annually: 33.51$

To check all our XEN plans or place an order go HERE

To check all our KVM plans or place an order go HERE

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

Operating systems: ( Windows 2008 server datacenter R2 and Windows 2012 server datacenter R2 )

Windows KVM:

Seaman:

512 Guaranteed RAM
30 GB HDD
2 Cores
1 Gbit Port
512 GB Bandwidth
1 IPV4 address
Unlimited IPv6
SolusVM Control Panel
Hosted in the Netherlands

Seaman Monthly: 5.09$
Seaman Quarterly: 14.37$
Seaman Semi-Annually: 26.95$
Seaman Annually: 50.31$

To check all our Windows plans or place an order go HERE

=====================================================================:
=====================================================================:
Payment methods:

BTC & ALT, PayPal, Perfect Money, WebMoney, Bank Transfer.
Western Union, BANCODOBRASIL, CREDIT/BANK CARD.

please click HERE
=====================================

Features:

1. Gig connections to every VPS
2. IPV4 and IPV6 enabled VPS
3. Hardware RAID 10 for optimum disk performance
4. Weekly backups
5. Managed services
6. SolusVM Control Panel
7. Flexible Upgrading / easy scalability
8. VPS located in the Netherlands
9. Reverse DNS
10. Instant Setup
11. Free incoming bandwidth
12. No Setup fees
13. No contracts
14. Money back guarantee within 14 days

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

HostSailor

To know more about us visit Our company
To check our terms of use please click on TOS
We offer an amazing service level agreement at SLA
For our Acceptable use policy check AUP
To get more info about our data center check Our data center

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

FAQ and Support:

Please check our FAQ
To get in touch with us via email please use contact us
To get in touch with us via LiveChat, please visit our site at HostSailor and we’ll be happy to help!

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

Our Social Media Pages:

to visit our Facebook page please click here
to visit our Instagram page please click here
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to visit our Telegram channel please click here

Where do i change the xml file – connection manager problem

This error is thrown by Connections collection when the specific connection element is not found.

looking at the 5 packages which make up the solution:
4 of the 5 packages have this:

connectionManagerID=”{yyyyyyy-yyyy-yyyy-yyyy-yyyyyyyy}:external”
connectionManagerRefId=”Project.ConnectionManagers(xxx.xx.xx.xx.XXXXXXX_RPT.xxxxxxx)”

The package which is causing problems (and it is Package 1) shows this

connectionManagerID=”{yyyyyyy-yyyy-yyyy-yyyy-yyyyyyyy}:invalid”
connectionManagerRefId=”{xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxx}:invalid”
How/where do I change this package to be like the other 4 packages? Can it be done in Visual Studio 2019?

I inherited this solution and it worked well but when it didn’t I started to try and solve it. I should have made a back up of the original file (but I didn’t – and I am now very very sorry)

So how do I fix this error?
Hope this makes sense.
Thank you
Jo

networking – Tuning Linux router and server for better performance / solving single TCP connection slow speed

I have a simplest/common network architecture.

Web server sits behind router on local network. This router does iptables DNAT so port forwarding is achieved to web server.

Therefore, I’m able to download file from server 1 to my computer over the internet.

enter image description here

My questions

  1. What is the proper kernel tuning to ensure that router is using most of its potential (for around 2000 connections and highest throughput)? I have an issue in ORANGE

  2. Do kernel parameters look fine on Server 1?

  3. Can you explain why I’ve got just 3mbps from Server 1 while CPU and RAM are not overloaded? So can you see other issues apart Linux kernel, CPU and RAM? Could you list these possible issues to explore? 1gbps network interfaces, ports, etc? 2×1.5ghz ARM is slow for routing? iptables version?

OS and resources

Computer – Mac OS 8 x86 CPU cores, 16G/32G of free RAM

Router – Linux DD-WRT 2 ARM CPU cores, 270M/512M of free RAM

Server 1 – Linux Ubuntu 18.04 4 x86 CPU cores, 240M/32G of free RAM (500M swapped to SSD)

Server 2 – Linux Raspbian 1 ARM CPU core, 95M/512M of free RAM

MTU

Everywhere 1500

TXQUEUELEN

Everywhere 1000

Protocols

UDP speeds are fine

TCP speed is affected, any port

Iptables version

Router – 1.3.7

Server 1 – 1.8.4

Server 2 – 1.6.0

Linux versions

Router – 4.9.207

Server 1 – 5.4.0-67-generic

Server 2 – 4.14.79+

Theoretical link speeds

From my computer to router – 30mbps / 3.75 MB/s

From router to web server 1 – 1gbps

From router to web server 2 – 1gbps

Download speeds from web server (file is hosted in RAM)

TEST 1: Server 2 -> Router = 800mbps

TEST 2: Server 2 -> Computer = 30mbps

TEST 3: Server 1 -> Router = 800mbps

TEST 4: Server 1 -> Computer using 15 connections = 15mbps

TEST 5: Server 1 -> Computer = 3mbps (the issue!)

CPU usage is at around few percents on any device. CPU load average is 0.0x on all devices, but Server 1 – it has 4.6 load average. Server 1 also handles around 500-1000 connections for other things outside of tests, but at around 1mbps so it shouldn’t affect test throughput dramatically (unless these connections somehow making things worse indirectly).

Regardless that load is higher, TEST 3 performed very well. So it’s still hard to blame Server 1.

There are no issues in dmesg on any device.

My thoughts

Issue appears only when DNAT’ing on router and only with Server 1 which has high amount of other connections (but these connections are almost idling so shouldn’t affect everything badly?).

Most interesting test to describe in final thoughts

When I do multi-thread web download (TEST 4) Server 1 performs much better.
So it’s capable to reach higher download speeds. But why 1 connection can’t reach same speed as multiple ones?

Parameters that I explored

Can you see something that is not well optimised for Linux router?

net.core.wmem_max – maximum tcp socket send buffer memory size (in bytes). Increase TCP read/write buffers to enable scaling to a larger window size. Larger windows increase the amount of data to be transferred before an acknowledgement (ACK) is required. This reduces overall latencies and results in increased throughput.

This setting is typically set to a very conservative value of 262,144 bytes. It is recommended this value be set as large as the kernel allows. The value used in here was 4,136,960 bytes. However, 4.x kernels accept values over 16MB.

Router – 180224

Server 1 – 212992

Server 2 – 163840

Somewhere else used – 83886080

net.core.wmem_default

Router – 180224

Server 1 – 212992

Server 2 – 163840

Somewhere else used – 83886080

net.ipv4.rmem_max – maximum tcp socket receive buffer memory size (in bytes)

Router – 180224

Server 1 – 212992

Server 2 – 163840

Somewhere else used – 335544320

net.core.rmem_default

Router – 180224

Server 1 – 212992

Server 2 – 163840

Somewhere else used – 335544320

net.ipv4.tcp_rmem – Contains three values that represent the minimum, default and maximum size of the TCP socket receive buffer. The recommendation is to use the maximum value of 16M bytes or higher (kernel level dependent) especially for 10 Gigabit adapters.

Router – 4096 87380 3776288

Server 1 – 4096 131072 6291456

Server 2 – 4096 87380 3515840

Somewhere else used – 4096 87380 4136960 (IBM)

net.ipv4.tcp_wmem – Similar to the net.ipv4.tcp_rmem this parameter consists of 3 values, a minimum, default, and maximum. The recommendation is to use the maximum value of 16M bytes or higher (kernel level dependent) especially for 10 Gigabit adapters.

Router – 4096 16384 3776288

Server 1 – 4096 16384 4194304

Server 2 – 4096 16384 3515840

Somewhere else used – 4096 87380 4136960 (IBM)

net.ipv4.tcp_tw_reuse – In high traffic environments, sockets are created and destroyed at very high rates. This parameter, when set, allows no longer needed and about to be destroyed sockets to be used for new connections. When enabled, this parameter can bypass the allocation and initialization overhead normally associated with socket creation saving CPU cycles, system load and time.

The default value is 0 (off). The recommended value is 1 (on).

Router – 0

Server 1 – 2

Server 2 – 0

Somewhere else used – 1

net.ipv4.tcp_tw_reuse

Router – 0

Server 1 – 2

Server 2 – 0

Somewhere else used – 1

net.ipv4.tcp_max_tw_buckets – Specifies the maximum number of sockets in the “time-wait” state allowed to exist at any time. If the maximum value is exceeded, sockets in the “time-wait” state are immediately destroyed and a warning is displayed. This setting exists to thwart certain types of Denial of Service attacks. Care should be exercised before lowering this value. When changed, its value should be increased, especially when more memory has been added to the system or when the network demands are high and environment is less exposed to external threats.

Router – 2048

Server 1 – 131072

Server 2 – 2048

Somewhere else used – 65536, 262144 (IBM), 45000 (IBM)

net.ipv4.tcp_tw_reuse

Router – 0

Server 1 – 2

Server 2 – 0

Somewhere else used – 1

net.ipv4.tcp_fin_timeout

Router – 60

Server 1 – 60

Server 2 – 60

Somewhere else used – 15

net.ipv4.tcp_max_syn_backlog

Router – 128

Server 1 – 2048

Server 2 – 128

Somewhere else used – 65536

net.ipv4.ip_local_port_range – range of ports used for outgoing TCP connections (useful to change it if you have a lot of outgoing connections from host)

Router – 32768 60999

Server 1 – 32768 60999

Server 2 – 32768 60999

Somewhere else used – 1024 65535

net.core.netdev_max_backlog – number of slots in the receiver’s ring buffer for arriving packets (kernel put packets in this queue if the CPU is not available to process them, for example by application)

Router – 120

Server 1 – 1000

Server 2 – 1000

Somewhere else used – 100000, 1000 (IBM), 25000 (IBM)

net.ipv4.neigh.default.gc_thresh1

Router – 1

Server 1 – 128

Server 2 – 128

Somewhere else used – 128

net.ipv4.neigh.default.gc_thresh2

Router – 512

Server 1 – 512

Server 2 – 512

Somewhere else used – 512

net.ipv4.neigh.default.gc_thresh3

Router – 1024

Server 1 – 1024

Server 2 – 1024

Somewhere else used – 1024

net.ipv4.neigh.default.gc_thresh3

Router – 1024

Server 1 – 1024

Server 2 – 1024

Somewhere else used – 1024

net.core.somaxconn – maximum listen queue size for sockets (useful and often overlooked setting for loadbalancers, webservers and application servers (like unicorn, php-fpm). If all server processes/threads are busy, then incoming client connections are put in “backlog” waiting for being served). Full backlog causes client connections to be immediately rejected, causing client error.

Router – 128

Server 1 – 4096

Server 2 – 128

net.ipv4.tcp_mem – TCP buffer memory usage thresholds for autotuning, in memory pages (1 page = 4kb)

Router – 5529 7375 11058

Server 1 – 381144 508193 762288

Server 2 – 5148 6866 10296

net.nf_conntrack_max – maximum number of connections

Router – 32768

Server 1 – 262144

Server 2 – no information

net.netfilter.nf_conntrack_max – maximum number of connections? If this is correct parameter, then 1560 is not enough

Router – 1560

Server 1 – 262144

Server 2 – no information

/proc/sys/net/ipv4/tcp_congestion_control – Network congestion in data networking (…) is the reduced quality of service that occurs when a network node is carrying more data than it can handle. Typical effects include queueing delay, packet loss or the blocking of new connections. Networks use congestion control and congestion avoidance techniques to try to avoid congestion collapse.1

Router – westwood

Server 1 – cubic

Server 2 – cubic

net.ipv4.tcp_syn_retries – Specifies how many times to try to retransmit the initial SYN packet for an active TCP connection attempt. The current setting is 20, which means that there are 20 retransmission attempts before the connection times out. This can take several minutes, depending on the length of the retransmission attempt.

Router – 6

Server 1 – 6

Server 2 – 6

net.ipv4.tcp_low_latency – The default value is 0 (off). For workloads or environments where latency is a higher priority, the recommended value is 1 (on).

Router – 0

Server 1 – 0

Server 2 – 0

net.ipv4.tcp_limit_output_bytes – Using this parameter, TCP controls small queue limits on per TCP socket basis. TCP tends to increase the data in-flight until loss notifications are received. With aspects of TCP send auto-tuning, large amounts of data might get queued at the device on the local machine, which can adversely impact the latency for other streams. tcp_limit_output_bytes limits the number of bytes on a device to reduce the latency effects caused by a larger queue size.

Router – 262144

Server 1 – 1048576

Server 2 – 262144

Somewhere else used – 262,144 (IBM), 131,072 (IBM)

botnet – ELF/PE32 IoT Malware sample execution & connection to C&C

Currently I am working on an IoT Malware project.

I have collected both ELF and PE32 executables of IoT Malware like Mirai, and Gafgyt from different sources. Now I have to execute these samples in Raspberry pi for dynamic analysis. For Botnets like these, C&C will be there to give them commands. Suppose I am executing these samples, How will all those samples connect to C&C?

I hope my question is clear.

As I am new to security field, it would be really helpful if anyone helps me with this.

networking – Program to continuously check availability of internet connection c#

I have a C# program to check if a hard coded host is available and if not, waits 5 seconds then checks again (this is a loop). How can it be enhanced?

using System;
using System.Net.NetworkInformation;
using System.Windows.Forms;

namespace trial17
{
    public partial class Form5 : Form
    {
        public Form5()
        {
            InitializeComponent();
        }

        static Ping p = new Ping();
        static string host = "8.8.8.8";
        static byte() buffer = new byte(32);
        static int timeout = 1000;
        static PingOptions po = new PingOptions();
        static PingReply pr;
        static bool load = false;
//plays media if connected        
System.Media.SoundPlayer player = new System.Media.SoundPlayer("media file path");

        private void Form5_Load(object sender, EventArgs e)
        {
            try
            {
                Show();
                conn();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        async void conn()
        {
            try
            {
                pr = p.Send(host, timeout, buffer, po);
                if (pr.Status == IPStatus.Success)
                {
                    player.Play();
//label updated after connection
                    label1.Text = "Connected";
                }
                else
                {
                    await System.Threading.Tasks.Task.Delay(200);
                    conn();
                }
            }
            catch (Exception) {
            }
        }
    }
}

network – Softether Mas OS asks “VPN connection username & password” but not on Windows

I’m trying to build a L2TP/IPSec connection. This connection is working on Windows but with my Mac it asks me this little window once it is connected. So I enter the server address, account name, password & shared secret and then click “connect” and THEN this windows pops up and I just don’t know what to do. I tried many different names (server name, user name, user@hub, etc.) but it keeps bugging. What’s very weird is that this window doesn’t appear in the documentation.

Thanks for any tips,

enter image description here

linux – IoT Malware ELF/PE32 sample execution & connection to C&C

Currently I am working on an IoT Malware project. I have collected both ELF and PE32 executables from different sources. Now I have to execute these samples in an isolated environment for dynamic analysis. But, I want to know how these malware samples connect to C&C.

As I am new to security field, it would be really helpful if anyone helps me with this.

windows 7 – PC internet connection goes offline intermittently, but always comes back online when I turn on my cell phone

Intermittently, my internet connection will terminate (I get the yellow exclamation point icon in my system tray). When this happens, I can consistently bring it back online every time by turning on my Galaxy S6 phone. It’s been doing this for a few years and I am just now getting around to asking about it.

About my system

  • Windows 7 (come at me)
  • PC connects directly to cable modem
  • Phone connects to wifi
  • I use syncthing to sync between phone and PC. First thought is to uninstall syncthing, but the issue is very intermittent and might not occur for several days on end

Anyone ever heard of such a thing?