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 have a test RODC (running on Windows 2012 R2 server-core) that I created in a perimeter network that I'd like to demote and remove from my domain entirely.  I'm having trouble finding documentation for this scenario that covers the process from top to bottom.  

Can anyone point me to a good source of documentation for this task?

Thanks!
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I wish to route TCP traffic from one colo location onto amazon web services ( central canada) , then onto amazon web services ( singapore) . What is the preferred way to do this using aws services ?
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Maximum size of IP and TCP  Packet.

There is a little bit of confusion when it comes to the Maximum size of IP and TCP  Packet
I did some reading nline, I have seen numbers of 65Kbytes and 1500 Kbytes but not clear which number goes with IP packet and which goes with TCP Packet.

Any Clarification?

Thanks
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I share a Bluetooth speaker booster with a colleague and every time I need it I have to ask my colleague to disconnect or “Forget this device” so I can use it.  How can I configure my mobile devices or the speaker to connect from one device and disconnect from the other?  (If possible)
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VoIP - My customer reports that their phone lose connection to the hosted service every day.  They have to reset multiple times per day.

I will be onsite sometime tomorrow (April 11) - hoping to be able to access some expert assistance.  Meanwhile, if somebody could point me to a link that I'm sure exists, to help me in troubleshooting VoIP.  I'm good at networking, but have minimal experience in troubleshooting VoIP.  Thanks in advance.
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Hi
My other networking question is abandoned. I think it has become a snail's nest, so I'll simplify it...pithy...

How is agar.io's networking perfectly natural, with no lag? You can turn your circle with a mouse click or finger tap, and the response never ever stalls.
Some dude has a javascript agar.io networking tutorial out there, below , which is v good, if you want to make a LAN game or ONLY localhost game, pure TCP/IP, but it isn't optimized for the big bad world, ..distance.


There is no UDP w a TCP safety net. How exactly did they make agario perfectly? Browsers eliminate UDP. I have a good Websockets link below that I like..
I am completely comfortable making Java game servers, btw
BTW, That javascript tutorial is here


I like this page I found for WebSocket aspects here
Thanks
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Cant print after upgrading Windows 7 to 10.  I have network printers and after upgrading two machines, neither can print.  Have uninstalled and reinstalled multiple times.  Other machines that were new installs of Windows 10 can print without issue.  So far the only thing i have been able to print is a pdf from Edge.  Test print fails although i do see the test page hit the queue momentarily before i get the failed to print message.  Please help.
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Internet explorer and Edge does not open webpages giving the following error: There was a temporary DNS error. Try refreshing the page.
Error Code: INET_E_RESOURCE_NOT_FOUND. When accessing the internet with Chrome, it works without any problems and you can access any website. I have reset network settings and also flushed the dns and cleared everything in the browsers. Nothing made a difference. Any idea what is causing this? Windows 10 pro is the operating system and this problem started about 2 weeks ago.
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Hello,
how I can create my own smart dns proxy ?
thanks.
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Looking for trustworthy recommendations for an IT contracting/consulting company in Brazil (Piracicaba, Sao Paulo service area).
Need some on-site hands to install new server and networking equipment along with VMware and Windows OSes.
Must be enterprise level capable.

Thanks.
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Hello fellow Experts Exchange members:

I request assistance with a confounding problem.

I have an office that uses Cisco Meraki access points all connected to a Cisco SG300-52P switch.

The office uses a separate vendor for their VoIP phone system.

The event log on the Meraki cloud controller is filled with entries that read "Multiple DHCP servers detected."

The entries state that the second DHCP server has an IP address that is not on any of our equipment with a MAC address that identifies it as a Cisco device.

When I put a secondary IP address on one of our devices in the same subnet as the unidentified device, the unidentified device responds to pings.  Using telnet to connect on port 22 brings up the text "SSH-2.0-Cisco-1.25" but typing any character immediately results in "Connection to host lost."

The unidentified device does not respond on port 80 or 443.

Reviewing the MAC address tables on our Cisco switch, the MAC address of the unidentified device is seen on a port that is physically connected to the VoIP phone system vendor equipment.

(There are multiple MAC addresses listed in the MAC address table for this port besides the unidentified device.)

However, when troubleshooting with the VoIP phone system vendor, their technician reports they cannot detect the MAC address of the unidentified device on any of their equipment.

The first part of my question is if it is possible for a MAC address to appear on the MAC address tables in a …
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My boss has a wireless network that shows up on his computer as being connected to 2 connections at the same time.  At least that is what it looks like.  It shows the wireless network of "Bison2" as currently connected to but underneath where it shows all of the connecetions in range, it shows "Bison" as connected.  He says it interferes with things which he could not explain to me what he meant by that.  When I right click the adapter in network and sharing (which shows it as connected to "Bison 2")   the SSID shows up as "Bison"

 See screenshots and let me know what is going on if you can.
Screen-Shot-2019-04-09-at-1.01.48-PM.png
Screen-Shot-2019-04-09-at-1.02.14-PM.png
Screen-Shot-2019-04-09-at-1.02.29-PM.png
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I have Charter Spectrum service here in western Oregon. I need port 9000 to be open to the internet on my pc, because we set up debugging on our remote web server and it needs to get through 9000 on my pc so it can talk to my Netbeans IDE. The Spectrum tech has no idea how to set that up. Ive tried in the router they gave me, a Sagemcom Fast 5260, but the port forwarding rule I set up just will not work. So, Im thinking about getting a better router than the cheapie they gave me. What's the best router available that will allow port forwarding?
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Hi

I have an igel on a Citrix server and the internet on it and using excel is extremely slow.

I’m stuck in an argument with my I.t dept at the moment as I’m convinced it’s the bandwidth is insufficient.

Is there any other common known causes for slowness.??
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Hi,

I am a new IT Specialist for a Financial company, and I use to be in charge of everything in my previous job. From IT Administrator, IT Technician, IT Support, and Network engineer plus any other big project we had. Now, I am in the same role, and an IT-Outsourcing company hosts our server and services. I had the same in my previous job, and I was employed to reduce the IT costs, which I did.

On my last job I had an agreement with the IT Outsourcing about have access to our server "Windows Server 2008 and Exchange 2010 plus all the passwords so I could give proper support in house. When I was on holidays, the IT Outsourcing company used to take over. Now, with this new job also and have an IT Outsourcing they are refusing to give me the passwords and settings we use to provide the necessary support. I want to find a way to deal with the IT company so I can use the support in the house.

That might seem to be a silly question, but I would like to hear from the IT Managers that had this experience.

Could you tell me where I could get the best advice in regards on how to deal with this situation?

I hope to hear from you soon.


Best regards,
Mallony
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hello
i have server with 2 nic that is connected to to netgear switch
the ports on switch is taged with multi vlan id
i have a pfsense on vm named fw
fw vm have 6virtual nic ... 5 connected to nic1 with defernet vlan identfy and its work fine with pfsese
the 6 virtual lan card connect to second nic and i have multi vlan setup on pfsense was on ita but its not working
how i can make trunk this virtual nic ?
thanks.
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Hi,
Can two machines in different subnet communicate ?
I have a machine1 - 10.42.1.192  
machine2 - 10.4.10.148
they are in different subnets.
machine2 is running a service which wants to sftp to machine1 (Sftp is running on port 22)
But the connection doesnt get established. Is there any way to achieve this.
Someway to allow sftp to be done to machine1 from machine2...
eg
1) we could create a user for machine1 sftp and passwrod using which we can connect to it from machine2
or any setup to be done on machine1 or machine 2 to allow this to happen


Thanks
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I'm trying to design a system for PCI compliance on a LAN that has pinpads for credit card processing.  I'm getting stuck on how to do MFA (Multi-Factor Authentication) on the firewall and on managed switches.

The basic plan is to use VLANs to isolate the pinpads from the rest of the network.  As I read the specs, the managed switches and the firewall will all be part of the CDE (Cardholder Data Environment) for which the strict rules apply.  As long as the isolation is maintained, the other devices (PCs, printers, server, etc.) are not in the CDE scope.

As I read the specs, I need to have MFA on any CDE device where an administrator can have non-console access.  That would certainly appear to apply to the switches and to the firewall.

We'll likely have to replace the primary switch (it's a small network of 6 users).  We're presently using a Cisco ASA 5505 firewall and would like to try to keep it.

My challenge has been with how to set up MFA on the switches and on the firewall.  I'm not seeing it as a feature in the few switches I've looked at.  I'm also not seeing how to do it on the ASA without adding a Radius server.  I could do that on the Windows server, but that would bring it somewhat into the CDE and I'd really like to avoid that.

I would greatly appreciate any insight as to how to effectively, efficiently, and inexpensively implement MFA for a managed switch and for the ASA.  If that requires a different choice of devices, please suggest a suitable …
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In an ISR at a client, they have a Cisco ISR with a VPN tunnel to a business partner. What I'm wondering is why they might have two peers
in sequence number 10 and one peer (which also appears in sequence 10) in the second sequence number. The original setter upper is
long gone. Is SEQ 10 saying try to connect to 169.45.97.62 but if you can't, connect to 169.45.95.222? If that's the case, why would there
be a need for a SEQ 20 which then again references 169.45.97.62? Any thoughts on what the original intent was are appreciated. I would
think you'd just want one peer in sequence 10 and then one peer in sequence 20. ?

crypto map ACMEDYNO 10 ipsec-isakmp
 set peer 169.45.97.62
 set peer 169.45.95.222
 set transform-set ACMEDYNO
 set pfs group2
 match address CRYPTO-ACMEDYNO-LA
crypto map ACMEDYNO 20 ipsec-isakmp
 set peer 169.45.107.62
 set transform-set ACMEDYNO
 set pfs group2
 match address CRYPTO-ACMEDYNO-DL
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Ansible Tower, trying to communicate with Windows server, error message:

SSH password:
PLAY [test windows connectivity] ***********************************************
TASK [Gathering Facts] *********************************************************
fatal: [WinTest]: FAILED! => {"msg": "the connection plugin 'winrim' was not found"}
PLAY RECAP *********************************************************************
Win-Test          : ok=0    changed=0    unreachable=0    failed=1  

Any help will be appreciated on this. All IP's have been enabled, WinRM also script run on the windows server etc.

What is odd the error displays winrim instead of winrm which is odd.

Any help will be appreciated on this matter.

Regards,

introlux
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I have multiple printers that have scan to email functionality. They were all working well, until someone decided to do a hard reset on our Comcast modem and wiped out all of the settings. After that we could no longer scan to email.

During this time I was in the process of upgrading the server and network, which I have since completed. Everything internally seems to be working, save for the scan to email function on our scanners.

The scanners are currently using domain.mail.eo.outlook.com as the SMTP address running off of port 25. No changes have been made to the scanner since the modem was reset.

I know we have a static IP through Comcast, which might have gotten wiped during the reset. Or some explicit firewall permissions were wiped.

Any ideas on what I can do to get my scan to email functionality back online?
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How to sort out the locking issues in MS access , we have a client who is running a supermarket , they have 5 cashiers who will be accessing the same receipt form , now I'm worried about the locking issues. How can I deal with the locking system so that all the 5 cashiers will able to use the same form and save data at same time otherwise if the other cashiers have to start waiting for one cashier to save data I'm afraid there will huge ques in the supermarket. All the 5 cashiers will have their own FE and the BE will be on their server and will be accessed through the network by all.


Regards

Chris
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I got Cisco SG300 POE switch which is currently going from one office to another office via fiber media converter. These switches have mini GBIC. The distance between these offices is 200 meters. Basically SW1 connects to fiber media converter and then goes to a patch panel and then to SW2. If we want to bypass the fiber media converter what would be the best way and also what kind of cables would I use?
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Hi experts,

I wish to know if I should divide a network in to subnets or I can use vlan or both?

Say if I use 192.168.10 as my network and the last octet as my host if I want 4 hosts I can simply chop it up with new subnet mask of 255.255.255.192 which gives me 4 hosts network (each subnet shouldn't be talking to one another unless I do some routing and set rules). I can also group the switch ports into different vlans and assign different network to each vlan. Say if I divide a 48ports switch into 4 hosts, then I will have 12 switchports per vlan and 192.168.10.x to vlan1 192.168.20.x to vlan2 etc... and device in different vlan will be assigned with different IP.

Will there be a case user will use subnet in conjunction with vlan? say if I divide the 192.168.10.x into 4 hosts and assign each host to each of the vlan instead of using different network? OR people will use either vlan or the subnet but not both together? Thanks.
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Hi EE,

Today we had a sudden spike on our Flash Array Storage network, something was running for 4 hours and consuming 1 GB of throughput.
We have isolated the spike down to 3 servers (virtual Vmware boxes); these servers are dedicated SQL servers training and dev environments no much activity on them normally.
I have checked to see any SQL jobs were running they weren't and restores were occurring this time.

Any ideas on how to troubleshooting this issue as we don't want this occurring tomorrow morning?

Thank you.
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Networking

94K

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.