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.

Share tech news, updates, or what's on your mind.

Sign up to Post

Dear Experts, we are moving our Data Center in the next 2 months. What should we consider and take note in order to move DC smoothly?

Our environment:
- 4 x Server ESXi6.5 (HP Gen9)
- 2 x Routers Cisco 3925
- 2 x Core Switch Cisco 3750/3560
- 1 x Firewall Sophos XG
- 10 x Access Switch Cisco CE500
- 5 x WAP Cisco Meraki MR18
- 5 x Physical Server IBM x3650

Many thanks!
Cloud Class® Course: Microsoft Azure 2017
LVL 12
Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

Hi All,

Have and existing cisco stack of 7 switches, all POE. The power for POE on one of the switches failed, data still works. Were replacing that switch with a new switch and just want some basics step to do so. We downgraded the new switch to match the IOS of the stack. Below is the current stack. Please let me know if there is anything else I need to be aware of when adding and removing a switch. Thanks,

Existing stack see stack properties below.
The priority of the master is 5 and all other switches are set lower
The new switch is set to 1 same as some of the existing switches, does that matter? or do I need to set the priority higher for master and assign a lower priority it for all other switches. If so, will I have to reload the stack?

Remove the switch
Power off and disconnect the stacking cables
 - commands -  no switch stack-member-number provision type. Is this step necessary?

Add new switch
Ensure IOS is same as stack
Ensure priority is lower than the master on the stack
 - command - switch stack-member-number provision type. Is this step necessary?

 1       Slave     0017.94b1.1780     1         Ready
 2       Slave     0017.94b5.c700     2         Ready
 3       Slave     0017.94b5.fa80     3         Ready
 4       Slave     0017.94b5.bd00     4         Ready
*5       Master    0017.94b5.d000     5         Ready
 7       Slave     fcfb.fbd5.ca80     1         Ready
 8       Slave     001b.2b65.0500     1         Ready
I use Redirected Folders extensively on my Windows based network. Through GPOs, my Documents, Pictures, Desktop, AppData, etc are redirected to a network path on the file server, instead of the local C: drive. I've used it this way for years and never had any problems.

Back around May 2018, I updated to Windows 10 Pro 1803 on my desktop PC. As you may have heard, this universally broke the redirection for AppData (for me totally unfixable with the registry hack work around, but now properly fixed by MS in a late June patch). So I had to roll back to 1709, which I'd been running before. This was a success and I carried on working with the 1709 release.

Everything works fine, but typically after approx 12 hours, the network connections for all my Redirected Folders seem to get cut off / deauthorised. I get a message up as so, if I try to refresh my desktop or access an SMB share on the file server:

The fixes people have posted online don't seem relevant as this is not a constant problem - as mentioned all is fine for typically about 12 hours after logging in. The only way to resolve is to log out and back in again, which clears the problem for another 12 hours or so.

I have tried upgrading to Win 10 1803 again, now the patch is available that fixes the issue with AppData redirection. Also, I have left the PC being part of the AD domain on my desktop PC, deleted the computer account from the AD domain, and rejoined again. No joy.

This is a…

I have a Windows 2012 R2 Hyper-V server running 3 VMs.  2 VMs are Server 2012 and the third is Server 2008.  Sometimes, I can't communicate with the Server 2008 from any device on the network.  I cannot ping it (using its STATIC IP--not hostname) or connect to it through RD.  I can ping from the Server 2008 to the other servers.  I just disabled the firewall on the Server 2008 temporarily to take it out of the equation but still not accepting pings.  I tried a tracert to it and nothing as well.  Please let me know how I can diagnose this problem.  I haven't tried restarting either of the VMs because people are working on them.  And, actually, there is one user that's connected to the Server 2008 now so I know that they were able to access it earlier in the day.  Thanks for any suggestions.
Hello Experts.
I came across a difficult situation today.

We integrated Aruba ClearPass (A NAC solution) for one of our clients who uses Juniper Switches.
Everything worked perfectly until suddenly the client called in Panic saying that an entire floor (in networking terms, a virtual chassis consisting of 3 switches) was down - no DHCP no nothing!
Immediately I thought well the ClearPass can't cause that, it only determines weather or not a computer should be allowed into the network and if so into which vLAN.
when I ran the Spanning Tree info I saw two ports that were flopping between forwarding and blocking, asking the client to investigate it became apparent someone, accidentally connected ge-1/0/15 with ge-2/0/41.
obviously as soon we broke the loop the network immediately started working normally again.
That got me thinking however.
Since one switch was trying to access another switch, the "recieving" switch would have to check with radius if that "device" should be allowed into the network, and since we never entered any of the switches, the NAC should've blocked it.
So I ran the "show chassis mac-address" command
And searched the NAC DB for that address but came up empty.
Which brings me to my question.
In a Juniper EX switch, does each and every physical interface has it's own MAC address? If so, how can I find the MAC address of a specific interface?
We have a client who has just had installed a BTNet Leased line installed.
They have 8 static (5 usable) IP address on the line (/29 subnet) assigned. Lets say this is
We have configured the WAN1 of the Draytek with this range and configured the WAN IP address as, subnet and its Gateway to point to

Connected a PC to the LAN1 and LAN2 Ports on the Draytek which allows us to access the Internet OK - All Works OK from LAN to WAN.

We are now trying to Port Forward specific ports (lets say 22 and 23 - SSH and Telnet) on the next useable IP address ( through to a device on LAN2 which has been configured on a different LAN/Local Subnet ( The device is on an IP address of, LAN2 IP on Draytek is

The Draytek can ping to the device with an IP of but we cannot seem to get the NAT/Port forwarding to work correctly.

We have tried using One to One NAT for this solution along with a Firewall rule to allow WAN to LAN2 traffic for these ports. Logging (SYSLOG) is turned on for this rule but no traffic is ever reaching the firewall rule as no logs are produced.

To see if we had set something up wrong we have also tried port forwarding these ports on the first WAN1 IP address of say but again nothing is logged with SYSLOGS

This is the first time we have tried configuring a Draytek, usually use Zyxel firewalls without any issues so I was …
I have windows 10 computer:

- when I am using the wired connection, I can access the network map drives.

- when I am using the wireless connection, I can not access the network map drives.

- How can I get my wireless connection to access the network map drives.
My Domain controller is giving me the following error VIA dcdiag:

Directory Server Diagnosis

Performing initial setup:

   Trying to find home server...

   * Verifying that the local machine SRADCFS, is a Directory Server.
   Home Server = SRADCFS

   * Connecting to directory service on server SRADCFS.

   * Identified AD Forest.
   Collecting AD specific global data
   * Collecting site info.

   Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=SRA,DC=LOCAL,LDAP_SCOPE_SUBTREE,(objectCategory=ntDSSiteSettings),.......
   The previous call succeeded
   Iterating through the sites
   Looking at base site object: CN=NTDS Site Settings,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=SRA,DC=LOCAL
   Getting ISTG and options for the site
   * Identifying all servers.

   Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=SRA,DC=LOCAL,LDAP_SCOPE_SUBTREE,(objectClass=ntDSDsa),.......
   The previous call succeeded....
   The previous call succeeded
   Iterating through the list of servers
   Getting information for the server CN=NTDS Settings,CN=SRADCFS,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=SRA,DC=LOCAL
   objectGuid obtained
   InvocationID obtained
   dnsHostname obtained
   site info obtained
   All the info for the server collected
   * Identifying all NC cross-refs.

   * Found 1 DC(s). Testing 1 of them.

   Done gathering initial info.

Doing initial required …
I have a customer that is running Quickbooks Desktop 2011.  (I think it is time to Upgrade!)  Just one user.  The QB file lives on the server.  She is getting an error that says: "Company File Error.   The disk or drive containing x:\sduncan\qbdata\qbfile.qbw is full.  In order to create more space, you need to remove some files.  After you remove the files, retry your operation."  
The network drive has plenty of space.
Any ideas why this error?  I searched Intuit and didn't really find anything.
We’ve been chasing an issue we’ve been unable to find a root cause for.  The symptoms are that random computers will lose their dynamic IP address and grab a 169.x.x.x IP address. They will however keep their default gateway settings.  If the user unplugs their network cable and reconnects it, the computer grabs the same DHCP address and works fine. I have tried reservations with the same issues. Happening at 3 different AD sites on different Vlans. I have ran wireshark and found no other rougue dhcp server listed besides my own. Happening on Win7/10 Hp/Dell. On other machines never have an issue plugged into the same switch. Scratching my head on this one.....
Cloud Class® Course: Microsoft Windows 7 Basic
LVL 12
Cloud Class® Course: Microsoft Windows 7 Basic

This introductory course to Windows 7 environment will teach you about working with the Windows operating system. You will learn about basic functions including start menu; the desktop; managing files, folders, and libraries.

I have a Bell (my ISP) 2000 modem/router.  It is connected directly to the PC beside it by way of an ethernet cable.  This modem/router sends a wireless signal throughout the house.  The wifi signal is picked up by other PCs, laptops, tablets and 3 televisions.  I would like to setup a simple home network for my PCs, laptops and tablets.
How do I do this?  I would like to do this without disrupting the existing wifi system throughout the house.
WDS Deployment issue

In my environment we have two network. One for servers and other for clients. Let's  assume servers network is and client network  is already deployed the WDS in network. our AD,DNS and DHCP  is located in network. Now  when I am trying to boot the client using PXE, client can't access WDS.

So how to resolve this issue.

If everything(WDS,AD,DNS,DHCP and client) in same network its working fine.
I run AVG Anti-virus, Hitman Pro and Anti-malwarebytes on one of my computers.  Over the last several weeks I am running into a whole lot of system problems.  I tried to install avg tuneup today and it would not install.  I called AVG and they stated that it appears that I have a network worm.  So I booted up in safe mode, ran avg scan and anti-malwarebytes.  

I also ran hijackthis, to attempt to get rid of the nastiness but one entry will not delete.   It has been a long time since I have cleaned pcs.  Anyone here like to direct me on how to get rid of this thing and clean up my computer so it runs right?


Busy with a project upgrading server for 5 AD site network.
All sites were on Windows 2003 Server with Exchange 2003 except for 1 site which I upgraded to Server 2012 R2 DCs and Exchange 2007 on a Windows server 2008 R2 machine.

Then over the weekend I upgraded 2 sites with Server 2012 r2 DCs and 2 x Exchange 2007 on a Windows Server 2008R2 machine.
Most of the mailboxes are migrated to the Exchange 2007 server, but emails are queuing on the 2 Exchange 2007 servers.
I also think during the installation of Exchange 2007, I missed the step to specify the Bridgehead Exchange 2003 server, and not 100% sure if this is the route cause.

I also ran the PS command to create the routing groups for Exchange 2003 to route emails to Exchange 2007, but emails are still not leaving the queues.

Attached is the Errror in Queue Viever.

Please please can you assist.
Fortinet remote access token and Lenovo x240 laptop.

When activated and run - token will:
Launch GUI
Accept - user credentials combination
Connect to the "wireless" of choice
All is good.

However as soon as I try to browse - I get a _dns error - unable to resolve,

When connecting to wireless (without token) - system will connect to any network available without issue.

Have tested the token on a different Laptop and it works.
Have tried my token on the x240 and it also fails.

I have clients that use dual uplinks for their customer sites
The second uplink, generally via LTE, serves as a backup access

The problem is that both uplinks obviously have their own public IP addresses

Therefore when in backup mode the site has to be reached via a different IP address

What alternative solutions/options exist that would allow us to present a single address to the outside world whether we are in normal or backup mode ?

I have a virtual 2008 (SBS2008) server and keep having issues with searches to shares on this server. Either the search results come very slowly or they are missing entries. We use network drives to connect from the workstations.

I've installed the Windows Search on the server which allows me to see the indexing status. It seems like whenever we have search issues, the server is indexing. Sometimes I can stop it and rebuild, which takes days, and then it works fine for about a month or so. But eventually it hits the same point.

Has anyone seen this or know what is causing it? I couldn't find any relevant errors. Some sources say not to use Windows Search but when I disable it, it all seems even worse.

Just now, when I paused the indexing I couldn't resume it. I noticed the indexing total number had been sitting at the same number for at least 5 minutes. There was no option to do so and Pause was still listed and grayed out. Restarting the Windows Search service got it to resume but I received several of these errors. I am unsure if they were caused by the service restart or not. The number of indexed items started increasing again after restarting the service.

The entry <path to a file> in the hash map cannot be updated.

Context:  Application, SystemIndex Catalog

      A device attached to the system is not functioning.   (0x8007001f)

Any ideas?
Greetings wise wizards of EE:

I'm helping a friend who has a Dell 2155cn network printer, which he uses for his Windows 7 laptop and Windows 10 desktop. While the device prints just fine on both machines via the network, I am having a devil of a time getting it to scan to the Windows 10 machine. The printer is connected to a wireless access point, as it is not wireless itself, and it sits in the garage.

This scanner is set up to scan to a shared folder, typically named "Scans", and placed just inside the C drive (C:/Scans). The scanner is typically set up using the internal web server page inside the printer, a link of which I enclose below. I have consulted the manual extensively, and set up the scanner "Address Book" page on the internal web server page for Windows 10 machine in the exact same fashion as the Windows 7 machine, being careful to use the proper settings, such as the user name, password and server (computer) IP address. However, I just cannot get the scanner to scan... it keeps producing a variety of "031-XXX" messages (link enclosed below), such as "Cannot find SMB server" or the like. I have tried temporarily disabling the firewall, re-downloading and installing the Windows 10 drivers, power-cycled the router, wireless access point, printer and computer, all to no avail.

I am completely out of ideas, and I am hoping one of you wise wizards can help. Here are some links to both the network scanner set up and error message page.

Dell 2155cn network…
I have a network that used the 192.168.1 subnet. Due to a conflict with a client's network when connecting via VPN I had to change our subnet to 192.168.2. Everything is working except the NAS drives which are still sitting in the old subnet. How do I communicate with those drives so I can configure them for the new subnet"  The workstations are all W10 and the servers are W2012 R2.
Get expert help—faster!
LVL 12
Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

I am working with a Brother MFC-9120 CN
I want to connect the printer to the home network wirelessly. The printer only connects to the home network.
I noticed in the manual it talks about using a bridge I think there was a USB device that came with the printer. No one knows or can locate that USB.

The printer does have a USB port. I read somewhere that I can buy a dongle insert the dongle in the USB port and it should connect to the network.

Any comments?

I have a ASA 5505 firewall with the 8.3 / later version, I have a Server connected to the internal interface 0/1 of the firewall but when the Server connects to an external network outside of my firewall the outside firewall needs to see the traffic coming from a specific IP. So my question is that can I hide my servers internal IP address under another IP address through NAT or something.  As an example My ASA 0/0 has an IP address 10.x.x.4 with mask and my ASA 0/1 interface has an IP Address of with mask and my server has an IP address of with mask Now my server is connected to the 0/1 of my asa firewall using a unmanaged switch. and the external interface of the firewall 0/1 is connected to another firewall ZZZ with IP 10.x.x.3.  Now this firewall ZZZ will allow the traffic from the Server only if the traffic comes from 10.x.x.5 with mask .. Can this be done using a NAT in firewall?
Dear Wizards, we are setting a iRedmail Server (Ubuntu v16) and would like to synchronize all mail accounts to an AD server (Window Server 2008R2)

For example: similar to an Exchange Server, when we create a new mail user, it will automatically create an user in AD server

Is there any way to do it? Can you please give me some resources? Many thanks!
Peplink Balance One router/ap unit reporting latency issues with wired/hard wired network devices.  need to perform direct to the cable modem first but I like to have access and documentation later for if and when I have to troubleshoot this unit.   The site seems to be lacking a manual nor is as easy as reaching the gateway IP to access the GUI.

Anyone familiar with access to this unit?  Does anyone spot the manual?  I sent a troubleshooting ticket a month ago to Peplink and they have yet to respond.  They don't even have one phone number on their site anywhere.
I'm trying to setup another SSID on a Cisco 2504 WLC. I've mirrored (I believe) the settings of an already existing SSID/network with the difference of subnet, etc. The traffic is routed through a Cisco 2811 and various switches. The switch that identifies the VLANs, has also been configured accordingly. Could be problems in multiple places since I've done this a number of times, but never came across this issue.

To start, I can't ping the interface IP of that newly created SSID from any device, including the switch that the controller is connected to.

This is the config of the switch that the controller is connected to where the other networks work:

I figure if I can get to the interface IP (as usual), I'll be able to get to my DHCP server, get an address, and get to the internet.

Any assistance is greatly appreciated.
did network map for sage file can open sage on host and another computer but can't on two computers in network






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.