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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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Hi,

In our lab I have 5 identical desktop computers with a wireless network connection (all same brand/same model/same software/bought on the same date)

We normally connect to these using RDP.  4 of those work absolutely perfectly. The 5th has a weird problem:
If I connect to this desktop computer using RDP and start a ping -t servername in a command window (on that desktop computer), every 10th ping either gets a "request timed out" or has a very high (>3000) time value while the others typically have 2 or 3ms.  This results in serious lag when using our engineering software.

What could be the problem? Anyone have any ideas?
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NFR key for Veeam Agent for Linux
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NFR key for Veeam Agent for Linux

Veeam is happy to provide a free NFR license for one year.  It allows for the non‑production use and valid for five workstations and two servers. Veeam Agent for Linux is a simple backup tool for your Linux installations, both on‑premises and in the public cloud.

Dear All


                I have upgraded esxi version from 5.5 to 6.5, and in the esxi i have a linux with 2 nic added, 2 are physical nic, and one of the nic is not attached to any network cable, after i turn on the linux, the 2nd nic has dhcp assigned, suppose if i added it correctly it will show no ip, any area i have configured wrong ? any help would be appreciated, thanks !

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Hi,

I'm looking for some advise on my network up-link configuration.

I have single Cisco 6500 series acting as a core/distribution switch in my network. Its Equipped dual Supervisors and multiple 1gig line cards.

My access switches are primarily Cisco 2900 Series in a stacked configuration.  Each switch stack has 2 up-links back to the 6500 Core and i am curious what is the best approach to configuring these up-links is ?

should i port-group these trunk links and create a cross-stack Etherchannel ? does this have any implications / downsides ?
or should i simply leave them as independent up-links and allow Spanning-Tree to control them.
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I have a trouble with Dolby Voice from BT , the below error appears and couldn't  do the meeting :
can't conntect to meeting there are issues with the network connection to avoid missing your meeting, please join by phone BT Meetme Dolby
Dolbyproblem.PNG
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Hi Support

Previously we able to access the Cisco ASDM in wireless segment and due to the cut off of the MPLS the wifi was breakdown.

Now we are trying to access the cisco asdm in client vlan, which mean we able to ping from the client desktop to the firewall.

How to allow the traffic from the client vlan to reach the cisco firewall. correct me i believe it need to allow in the cisco firewall for the client vlan to reach the cisco asdm.
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Hi,

I have linux server in a network that I cannot acces from outside. I create an autossh from those server to a Web Linux Box.

I' connecting to the Web linux box, and do a ssh root@localhost -p 6666 (6666 is the port I use for reverse ssh)

On inside server in rc.local I have : autossh -M 10984 -N -f -o "PubkeyAuthentication=yes" -o "PasswordAuthentication=no" -i /root/.ssh/nopwd -R 6666:localhost:22 root@WEB-LINUX-Box -p 22 &

In Web Box I can do : ssh root@localhost -p 6666


But the thing is, I want to use my web browser to access web service into Inside linux Box. How can I do reverse SOCKS Proxy in this case?

Regards,

JEAN
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Hello,

Recently our internet bandwidth has been slowing down drastically. We are suspecting certain staff are streaming music or video during the working hours either on smart devices, tablets or possibly company computer within the network. We would like to know if there are any recommended solution or network bandwidth monitoring tool out there that we can use to perform a test on our network.

Thanks,
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I have Database.mdb which is a 570 meg file on a Windows Server 2016 shared directory.  

When I drag it to  \\CPUDesk c: drive it takes 10 seconds.  This is a $400 windows 7 proiDell Inspiron 620 desktop that is 6 years old.

When I drag it to a \\CPULap c: drive it takes 50 seconds.  That is a brand new $700 windows 10 pro Dell Inspiron 15 laptop with a fast i7 chip and 8gig memory and a super fast SSD SanDisk x400.

I am shocked that an old cheap desktop is so much faster than the latest technology laptop.

At first I thought it might be a bad Cat 5 cable or switch port, so I swapped the laptop and the desktop and reran the test with the same result.

CPULap has a 1000 gig NIC which is confirmed because the network switch shows two green LEDs.  

Does anybody have any ideas of how I can trouble shoot this?  

rberke.

P.S.  At the risk of giving "Too Much Information", here are some additional facts, to muddle the picture.


I tested the copy on other cpus
*1 year old windows 10 pro laptop ($1300 quad core Lenovo t460p) also took 50 seconds.
*3 year old windows 10 pro desktop took 10 seconds
*3 year old windows 10 pro desktop took 10 seconds
* 5 year old windows 7 pro desktop took 10 seconds
* 4 year old windows 7 pro desktop took 50 seconds


* 2 month old windows 2016 server took 1 second (no surprise, because that copy didn't even go through the switch.)
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Hello EE,

I am working on a network drive migration task and all has been going well with this command which will copy source to the destination and keep all the permissions\ACLs intact and gives me a nice log file to review the results. This command does not mess up anything on the source but will mirror it to the destination which is what I want for time being:

robocopy "\source-server\share\folder" "\destination-server\share\folder" /zb /MT:32 /mir /copyall /dcopy:T /V /tee /LOG+:C:\temp\robocopylog.txt /r:0 /w:0

All is well :-) Until I realize that I have tiny window for the final copy before full cutover to the new storage.

Problem: command above is taking close to 31 hours to run for 9TB of data and my cutover time frame is only about 12 hours. I re-run the command every 48 hours to check for changes to the data on source to update the destination and it appears there are millions of small files which are slowing down the copy.

All the data is there just want to keep the destination up to date with new robocopy command and slim down the time without jeopardizing the data or permissions\ACLs.

I have narrowed down a couple folders I could exclude from these subsequent copies to shave down the 31 hours to roughly 9 hours by reviewing the data.

I have been trying out the /XD switch and cannot get it to work.

Here is a example of the /XD added to the command;

robocopy "\source-server\share\folder" "\destination-server\share\folder" /XD …
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I have a network with many vlan's configured and one of them is my WLAN for Guest network that has no access to any of the other VLAN's.  I need to allow for a couple of url's (public IP) to allow to connect back in.  

I am not sure if this is something on the VLAN or at the ASA.  

I am not sure what information you will need to assist so please let me know I and I will supply.

NOTE: I am very green when it comes to Cisco cli so please be patient
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[eBook] Windows Nano Server
LVL 1
 [eBook] Windows Nano Server

Download this FREE eBook and learn all you need to get started with Windows Nano Server, including deployment options, remote management
and troubleshooting tips and tricks

Hello everyone,
I just had and issue with a client where I ended up having to change the DHCP scope and network id.  I have changed the DVR to match the network and then after that it is now prompting me any anyone else to tries to log into it or make any changes with an admin username and password and I know I did not configure it to do that.  Also no one knows who this was purchased from which makes this even more challenging.  I have reached out to a camera company to see what could be done and then he recommended that I do a firmware upgrade to default factory reset it and the website he directed me to did not have any firmware for that device.  Does anyone know where I can either find  a firmware update or somehow default factory reset it.
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When I want to create a new virtual machine I get the following error:  The portgroup for Network adapter 1, VM Network, could not be found. It has been assigned to VM Network.
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Hi, I am trying to determine if I have Hyper-V manager server role configured correctly for my virtual environment.  In particular, virtual switch manager.  Why is it using an actual IP address from my network?  And is this necessary?  If not, how can I go about allowing it to reach my DHCP server on the network for the VM's that reside on the Hyper-V host server, yet not use an IP address from my very limited available IP's on my server network?

Hyper-V Host Servers:  Microsoft Windows Server 2012 R2 - Standard & DataCenter editions


Let me know if you require further details/information to answer these questions.


Thanks in advance.
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We currently have a fairly simple set up, we have ONE public Web Server IP.   Our In/Out path is ISP line to our Cisco ASA/Firewall to our Host Server.    We use Static IPs from the ISP.   Our objective is to achieve highly reliable access to our Web server.  

We are looking at solution such as DNSMadeEasy + DNS Failover.  

Would the following plan work?
1) We'll acquire a new ISP #2 service as backup for our ISP #1 service.
2) We'll acquire a new Switch. On site our location we'll plug the two lines from ISP #1 and ISP #2 into the new Switch.
3) Run a single line from this new switch into our existing CISCO ASA router, and add configuration rules to Cisco for the new source IP addresses to mirror the rules already there for NAT, port forwarding, etc.

Any recommendations would be appreciated!
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Hi, I am trying to determine the best way to configure a WAP4410N, with our ASA5505, so that the WAP will have 3 SSIDs. 1, "Wireless-Inside" will allow internal users to connect to the internal network, 2 "Guest-DMZ" will allow guests access to the internet and not the internal network, and 3 "TimeClock-DMZ", which will only allow our timeclock to connect over the internet to its web instance.

interface Ethernet0/7
 switchport access vlan 30
 switchport trunk allowed vlan 1,15,30
 switchport mode trunk
!

*Inside: This network has Static IP Addresses
interface Vlan1
       nameif inside
       security-level 100
       ip address 192.168.50.140 255.255.255.0
      !
      access-list Inside-to-any extended permit ip 192.168.50.0 255.255.255.0 any
      nat (inside) 2 192.168.50.0 255.255.255.0

interface Vlan15
       description Internal Wireless
       nameif Wireless-Inside
       security-level 100
       ip address 192.168.60.254 255.255.255.0
      !
        access-list Wireless-Inside_access_in extended permit ip 192.168.60.0 255.255.255.0 any
      access-list Wireless-Inside_access_in extended permit icmp 192.168.60.0 255.255.255.0 any
      nat (Wireless-Inside) 2 0.0.0.0 0.0.0.0
      access-group Wireless-Inside_access_in in interface Wireless-Inside
            
      dhcpd address 192.168.60.100-192.168.60.200 Wireless-Inside
      dhcpd dns 192.168.50.50 interface Wireless-Inside
      dhcpd enable Wireless-Inside

interface Vlan30
       description Guest
       no forward interface Vlan1
       nameif Guest-DMZ
       …
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Hi,

i need to rollout some software in our companys network, because i don't want to install it manually i need a way to install it automatically.
GPO is no option, because i don't have a .msi but a .exe.


Regards JoNNy
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Hi,
I'm facing an issue with my Hyper-v host 1 . last couple of days when the backup job run to backup hyper-v host including virtual machines . I get below error and virtual machines lose network connectivity and loses the failover cluster communication .

"Failed to allocate VMQ for NIC B038F6F3-B1DB-48CF-9566-A98A0E7340F0--D5DAA699-7131-42C1-B895-3658D6F16959 (Friendly Name: Network Adapter) on switch 91306166-6B98-498C-B029-D552838FCD61 (Friendly Name: External). Reason - Maximum number of VMQs supported on the Protocol NIC is exceeded. Status = Insufficient system resources exist to complete the API. "

usually the virtual machines can be reached on network in 15 minutes . but its been 8 hours a mailbox server virtual machine is not accessible through network and i have tried accessing through hyper-v manager but its unresponsive .even i tried shutting down from hyper-v manager but throws me error. Is there any way to access the unresponsive mailbox virtual machine other than turning it off from hyper-v manager at the moment make the mailbox server up.
I'm desperately waiting for a help .
Thanks in advance.
PS:- hyper-v host in windows server 2012 standard
Hyper-v virtual machine is exchange 2013 enterprise mailbox server
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I am putting together some phone equipment and servers in a datacenter cabinet.  The datacenter is providing us a redundant router connection using HSRP.  The cabinet has two Ethernet cables: primary, secondary.

We need external routable addresses for each of the two border controllers for the phone system.  They have a WAN port and a LAN port so they can have an external (outside the firewall) connection and also have a local IP address in the same subnet as the servers in the cabinet.

We are trying not to purchase another $2000 Cisco switch for the setup to accept the 2 Ethernet connections.

We have a WatchGuard M370 firewall device with several ports that can be configured in many ways.

We have two layer 2 switches available in the cabinet for use outside and/or inside the firewall. It is a layer 3 device.

I need help in the configuration of this system.

One suggestion was to take the two datacenter network cables and plug them into a standard Layer 2 switch then patch that switch into an external interface on the firewall.  After so many attempts I am trying to remember but I think the path to the internet was broken when BOTH router cables were plugged into that switch.  I am going back to the datacenter tomorrow to try more things but I wanted to get some input from you guys first.  I have the datacenter IP sheet where they provide me the configuration info but didn't want to post live addresses on this site.  Basically they gave me a \29 subnet and …
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I have a Mac Air (running High Sierra) user whose images have been replaced with red Xs and the message "The image part with relationship ID rld8 was not found in the file" in word (o365) files from our offices shared network.

this typically happens when she works with the files on the network (vs saving them locally first).

so she will open a word (o365) file on the network, make an edit and save. it will take a long time to save and then when it is reopened (by any user, not just by herself) the images will be missing. this happens on site (in the office) and offsite (running form home through VPN) and it happened before she updated to high sierra as well.

i have read that best practice is for users to save files locally before editing and will encourage her to do that with more consistency but wanted to find out if there was anything else she should be doing  as well.
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Concerto's Cloud Advisory Services
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Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

I back up my network monthly to a 3 to 4TB HD, and store the drive. I have been using usb 2.0/3.0 SATA adapters for this for almost ten years.  I probably have a dozen or more of these adapters, some originally bought back when I was only using 1-2 TB drives.  
Recently, it seems that many of these devices cannot read/access these bigger drives: I format the drive to max (3-4 TB), write the data, verify that the data can be read, and store the drive.  
However, putting a drive in a different device, it won't read the data, or even recognize the drive.  In Disk Management, it appears only to recognize an "2048GB Healthy (GPT Protective Partition)", and a "1678GB Unallocated" one.  In other words, it seems to be unable to recognize the actual GPT format of the drive.  Some of the drives will never recognize the GPT; some do occasionally; some will if attached to a USB 2 port, but not a USB 3.  Many work part of the time.
Usually, I can remount the drive in the original toaster and read the data, but there have been a few instances where I could not even get that to work.  So far, I have always been able to find a device that eventually would read the data, but this is a troubling trend.
I can't seem to find any discussion of this.
Servers: MS Server 2012R2 (same problem with 2008R2); Windows 7 & 10.  USB adapters from Rosewill, Masscool, IcyDock, StarTech, Orico, Thermaltake, etc.
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One of the Experts here on EE suggested GFI Languard.  So, we bought it and have  had it running for a few months.  As I get further into it and want to take advantage of its capabilities, I naturally have questions.

Being a "good customer" I figured to start on the community forum.  But I can't log in and I can't set up a new account.  I have LOTS of email addresses available and can set up new ones.  Yet, no matter which one I enter for a new Registration, it says "already used".  Can't be true of course.

Telephone customer support takes one to a menu that has nothing to do with customer support and, if you politely wait after not responding, it says "Goodbye".

I may be in the market for 3rd party Q&A at least.  Or, what might you suggest?
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I am looking to get a patch panel diagram together. Dont know the brand of panels but 1 U's 24 ports.  I cant seem to find a good stencil set for Visio that includes both the front ports and the back for the punch downs.

Any recommendations?  tried visiocafe already.
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I found an old Domain Controller that is no longer exist on our network via the attached "Active Directory Sites and Services"

Can I simply right click on the object (SRV-GC2) and delete it ?


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When attempting to save multiple attachments from an email nothing happens. As seen in the screenshot I can select multiple attachments but the will not save locally or to a network share. I can save single attachments with no problem. Anyone know what the issue is?
Capture.JPG
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We had servers shut down for a couple days over the weekend due to power outages. Since they came up, we've been having a multitude of time-sync errors, and on the server side have been able to resolve the issues so that everything has the correct time...now, out clients have issues remoting in to servers, or connecting to shares with the error being that the server is not synced with the primary domain controller....the strange thing is that they are. They all point to server1 which has the FSMO roles. Computers have been restarted yet the issue remains. Any thoughts?
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Networking

91K

Solutions

66K

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.