Networking

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Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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I would need some advises about the following situation:

At my job an external vendor has developed a web application and every thing is going well, but now the end user is asking to be able to access this same application but with an iPad or and iPhone, but when we try to access it via these devices, but the problem is that when we try to access via the Safari app,  I get the message that the Safari couldn't "reach" the server, Although the iPhone is connected to the local network. So I wonder if you can help me by telling what do I need to have or check for being able to see this application with Safari App.

Assumptions:

1. The Web application works perfect in the Laptops.
2. The web application is developed in IIS and also uses SQL Database. This application and DB reside on a local server inside the network
3. I tested the connectivity between the device and the server and I can ping that server.


So what else do I need to check in ortder to verify if tthe application can be accessed through the iPhone/iPad?
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Hi. We have some problems with DNS resolution in our network. Maybe, we made some misstakes in the DNS config...

Basically, the clients at the different subdomains alltimes have set the DNS servers from their local subdomain, then the DNS-Servers itself has set the DNS-Servers from the Root-Domain as primary forwarders. And on the Root-DNS-Servers, the DNS-Servers from our ISP are set as forwarders. Essential to know is, that roles like Exchange, ERP-Servers... are installed on servers located in the root domain but the users and clients are member of the child domains. Now we have often some issues with name resolution, exchange connection errors (autodiscover problems) and so on. But no explicit error messages on the systems. So i think there are general issues in the DNS Config.

We have the following AD- and DNS Setup (names are changed for security reasons) :

Root-Domain:
Domain Name:  COMPANY.local
Location:  Headquarter (Schlossrued, switzerland)
Subnet:  192.168.50.0/24
Members:  Only central Servers like Exchange, Fileservers (DFS) and other central Applications are member of the root domain. No Clients and no Users!
Domain Controllers: 2 DC on the main location (Windows 2016), 1 DC in every other location. All DCs are GC and have DNS installed.
DNS-Config:  The DCs has 127.0.0.1 as the first DNS Server and the second DC as secondary entry in Network properties. DCs in other location also have 127.0.0.1 as first an one of the DCs in HQ as second DNS. …
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trying to create a script using plink.exe and keep running into this issue:
when i use this syntax, it works:

C:\WINDOWS\system32>plink.exe -ssh me@12.12.12.12 -pw password123 -m "c:\temp\cisco.txt"
The first key-exchange algorithm supported by the server is
diffie-hellman-group1-sha1, which is below the configured warning threshold.
Continue with connection? (y/n) y
Type help or '?' for a list of available commands.
ciscoasa> en
ciscoasa#*************

but i want to get rid of the prompt (continue with connection?) (y/n)
so i use this:

C:\WINDOWS\system32>@echo y | plink.exe -ssh me@12.12.12.12 -pw Password123 -m "c:\temp\cisco.txt"
The first key-exchange algorithm supported by the server is
diffie-hellman-group1-sha1, which is below the configured warning threshold.
Continue with connection? (y/n) Type help or '?' for a list of available command
s.
ciscoasa> en
Password: ***************
ciscoasa#
ciscoasa#
ciscoasa#
ciscoasa#
ciscoasa#
ciscoasa# FATAL ERROR: Server unexpectedly closed network connection

C:\WINDOWS\system32>

anyone knows why the fatal error?

thanks,
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How do MongoDB and Active Directory go together?

I have a small bit of exposure to MongoDB and  Active Directory as well. But is there so synergy of using them together?

Curious..

Thanks
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Hi,

I have Hyper-V installed on my Windows 10 Professional. That works fine, but the vm's don't have network.
The vEthernet (Default Switch) is in disconnected state, probably due to a config on the W10 (a Cisco Anyconnect and a Palo Alto client).

What should I do to make this work correctly (messed up previous attempt -tried to change network configs- which made me reinstall the W10)?

Please advise.
J.
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I have 70 brand new Cisco switches that need configured. Is it possible to do a base configuration on multiple switches simultaneously? This way I can program say 10 at a time with a base config.

Thanks for any help if it's possible.
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I need to add a DNS entry for a domain that is not mine, but connected by VPN. Additionally, it is the name of a public domain.

Our network (net1.local; 10.12.0.0) is connected to another (domainX.com; 10.100.0.0) via VPN.
Domain.com is also a public domain with a public IP range.

I have a request to map 10.100.55.55 to oracle.domainX.com.
Can and how do I do that without causing issues with accessing the actual domainX.com websites and features?
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I ma looking to setup VLans for few reasons. Right now we have a stack of Cisco C3750X and all machines are in VLan10. VLan10 has an IP address of 10.10.10.235. Our current IP scheme is 10.10.10.x 255.255.254.0. All devices have a default gateway of 10.10.10.254 which is out firewall. If i bring up say Vlan 20 give it and IP of 10.10.20.1 with a SM of 255.255.255.0  i know i would have to issue ip route on the switch to route between the two Vlans, my questions is since the 10.10.10.x network is looking to 10.10.10.254 as the default gateway will those devices still be able to communicate with the 10.10.20.x network? and would all devices on 10.10.20.x be able to get out to the internet?
Drawing1.vsdx
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related to my previous question
https://www.experts-exchange.com/questions/29101150/be-prompted-who-can-call-home.html


I like zone alarm more than hosts file or looking through logs


There are pop up messages in sys tray telling me that skype is connecting 3 different ways
Do I approve. Yes
And I save that approval.
I will try blocking to see how programs can malfunction.


Due to my skill level; I am looking for another program like zone alarm where I am prompted to allow/deny a program access to network/intenet
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We currently have two Nexus 93180YC-EX and two Nexus N2K-C2248TP-E-1GE in our environment. From all the articles that I've read so far, the Nexus 9K will only support topology 1, but doesn't support topology 2 (see attachments), is that correct? Any input will be greatly appreciated.
Nexus-vPC-Topolog-1.jpg
Nexus-vPC-Topolog-2.jpg
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I have a user that reported an issue with his PC today, he said a winsock error message appeared on his screen and then he couldn't access any network resources or the internet. We solved his issue with a restart of the computer, my question is this, can I review the computers event log for information on these errors when the occur? I didn't see his screen so I don't know if an error message number or ID was displayed, therefore I am not confident that his issue has been permanently solved.
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After doing a crossforest migration for about 1000 user, some of the migrated user's computers were migrated using a 3rd party free tool called Profwiz which shows more success than ADMT from a previous experience.

Due to some Network standards we were not able to change the DNS to point to the Destination Domain's DNS. So migrated computers are using the Source Dc's DNS through router DHCP.

Some of those migrated users have found that they are no longer able to login to their PCs and that their PCs lost domain access and when we checked.

The common event IDs between those clients who were disjointed from domain are as following:

Event ID
10016
The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID

8033
The system failed to update and remove host (A or AAAA) resource records (RRs) for network adapter
with settings:

8016
The system failed to register host (A or AAAA) resource records (RRs) for network adapter
with settings:

8018
The system failed to register host (A or AAAA) resource records (RRs) for network adapter
with settings:

8033
The system failed to update and remove host (A or AAAA) resource records (RRs) for network adapter
with settings:

Only 2 computers out of 20 got this error
5719
This computer was not able to set up a secure session with a domain controller in domain CALIKSOA due to the following:

I would appreciate any thought on this.
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Good morning expert,
I have a simple (possibly) question for you today...
I'm in charge of revising the network configuration of my company... we are small but we flip around a lot of massive data and VMs...
I was looking into these switches from netgear:

Netgear Switch

I thought about getting 2 or three in preparation for possible expansion of company (2 for now is enough) and use the 10Gbps SFP+ connections to link our gateway/firewall to the first switch, a second port to connect to the other switch in a stack and a second port on the second switch to connect to our main server...

We are planning on implementing a VMWare ESXi cluster (3 machines for HA and Load balancing) in the future to deal with the enormous amount of VMs we use...

My question is... is this config possibly going to work or is there a better solution? And are uplink ports safe to use as links to servers?? Are they managed in a different way?

Gateway<--->Switch1<------------->Switch2<--->MainServer
                                        | >VMmachine1      | >VMmachine3
                                        | >VMmachine2
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Good Day,

I am thinking of sharing internet between two different offices. Kindly advise the best device to use, because we got fiber into the first office and don't want to pay multiple internet fees for the other office.


Based on google maps the distance is roughly: 250Meters, these buildings are the tallest around.

I need a 95% always working system , as internet is very key to e-commerce operation.

Do I run another fiber or simply use a bridge?
250M-distance.png
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unable to reach to a VirtualBox VM from outside ...viz. not able to ping to the VM.

VirtualBox : Version 5.2.12 r122591 (Qt5.6.2)

Using Bridged Adater ...on a DHCP network

VM (a windows 2012server) able to get/recieve dhcp ip address and able to ping to other hosts within the network,  also to be noted windows firewall in the vm has been allowed to communicate on both TCP/UDP for incomming traffic on all ports on the VM.

unable to ping /reach to the VM from other hosts.
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1. Can someone explain me if there is any changes in .cloginrc file, I need to run the rancid-cvs and rancid-run,
2. When i am trying to login i can see that the username is not pulling from what is there in .cloginrc.

For Eg:
(Under my clogin file)
I have mentioned
add user 1x.x.x User1
add password 1x.x.x       {password}
add method 1x.x.x telnet ssh

But when i am trying to login, i can see that username is in rancid. I am not sure why its happening. And to make sure that if try firewall login or normal login, its going with actual username only
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https://www.softperfect.com/products/networx/

With NetWorx you can:

    Find out and monitor how fast your Internet connection is and how much Internet traffic you consume.
    Verify whether your ISP charges your Internet usage fairly.
    Detect a suspicious network activity on your computer.
    Perform simple network tests such as ping and trace route.
    Be notified about excessive Internet usage.

Yes I can get notified but can I use the interface to block a suspicious network activity on my computer and keep that program running.
I dont want to have to find the program and shut it down completely
I want to play windows solitare but dont think that the program requires access to the intenet
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Is there a Microsoft tool for testing Skype for Business video performance?  There exists for audio NetworkAssessmentTool.ext which allows you to make hundreds of simulated skype audio calls and gain insight into network preparedness for audio. Is there any similar tool that looks at Skype for Business online video?
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Open VPN client can connect, access internet but cannot ping any internal IP
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How do I automatically back up Outlook files?   I am using Outlook 365 Business.   I want to back up the data files automatically on a NAS on my network.
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Searching network folder and files from High sierra OS is not giving results. Please advise how to resolve this issue
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Dear Experts, I'm testing this network diagram with EVE-NG

11.PNG
Without the NAT translation and access-list, all 3 VLAN PCs can ping to 8.8.8.8, SLA also work OK to switch from default route to backup route.

With the NAT and access-list, PCs from VLAN11 and 12 could not ping 8.8.8.8 although I allowed icmp on R1's interface. The PC on VLAN13 (not it NAT and access-list still could ping to 8.8.8.8). How can I fix it with NAT and access-list?

I attached the configuration files.
Desktop.zip
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hi all,
I want to disable Network Level Authentication (NLA) on a server 2012 R2 so that I can use remote desktop service to access the server. the following error message appears when trying to access via remote desktop:




1. allow logon via remote desktop option enabled

2. "allow connection from only computers running remote desktop throw NLA" option is disabled

3. tried the following to disable NLA with no luck:

   
Remote Registry

Start > Run > Regedit. You may need to use "RunAs" to launch it using an account with admin priviliges on the target server.
File > “Connect Network Registry…”
Enter remote computer name and click OK.
Navigate to HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp
Select “SecurityLayer” and change the value to 0.

Remote PowerShell

$TargetServer = "Server_with_NLA_Enabled"
(Get-WmiObject -class "Win32_TSGeneralSetting" -Namespace root\cimv2\terminalservices -ComputerName $TargetServer -Filter "TerminalName='RDP-tcp'").SetUserAuthenticationRequired(0)

Group Policy

Create and apply GPO to the server(s) via the Group Policy Management Console.
Edit the GPO and navigate to the following setting:

Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Security
Set the policy ""Require user authentication for remote connections by using Network Level Authentication" to DISABLED
any solution please?
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Hello experts!

I was required for a gig at the freelancer com market place to prepare charts with Virtual Machines performance. The host is running Hyper V on Win 10 Pro.

I believe that for getting to know the network traffic in/out from VMs, this info could be taken from the performance counter Hyper-V Legacy Network Adapter, which should be queried against
Win32_PerfFormattedData_EthernetPerfProvider_HyperVLegacyNetworkAdapter
when using WMI. Is this correct? If not which would be the correct way?

The other performance option for knowing Network traffic in/out is Hyper-V Virtual Network Adapter but I cannot find the correct WMI table (I am using this reference: http://wutils.com/wmi/root/cimv2/win32_perfformatteddata/)

My concern is that the Hyper-V Legacy Network Adapter is not available on WinPro because when I query I do not get data, but with other performance counters i.e. with processors info, I do get data.

I appreciate so much your advice that you can provide.

Many thanks!

Serge
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i'm runnig the hyper-v role on a server 2012r2.  There are currently 4 guest running server 21012r2 version. I seem to have a conflict between two of the  Hyper-V guest that when one is running it seem to stop the network on the other guest, meaning i cant ping the host or the router but have no issues ping other guests.
When i shut down (not a reboot) the not working guest and start up again i loose the network on the other. currently i literally can only run 1 of the 2 guest at the time. however the other 2 guests are not affected.
i dont seem to have an ip or mac conflict. Some other conflict is causing this issue. any help is appreciated
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Networking

92K

Solutions

67K

Contributors

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.