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 am trying to determine the root cause of slow file transfers to the internet from our backup appliance. We are seeing data transfer rates in the 3Mb/sec range, while performing a speed test on the same switch/VLAN/subnet yields a 300Mb/sec throughput.


Looking at the stats on the switch port connected to the appliance it would appear that the output rate (542Kbps) is way below that entering the port (20Mbs). Can anyone explain why the input/output appears to be so different and what might be done (if needed) to speed this up?



MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, medium is broadcast
  Port mode is access
  full-duplex, 10 Gb/s
  Beacon is turned off
  Auto-Negotiation is turned on, FEC mode is Auto
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned off
  Switchport monitor is off
  EtherType is 0x8100
  EEE (efficient-ethernet) : n/a
  Last link flapped 6d00h
  Last clearing of "show interface" counters never
  3 interface resets
  30 seconds input rate 20774480 bits/sec, 1810 packets/sec
  30 seconds output rate 538656 bits/sec, 919 packets/sec
  Load-Interval #2: 5 minute (300 seconds)
    input rate 20.78 Mbps, 1.77 Kpps; output rate 542.22 Kbps, 899 pps
  RX
    159749599463 unicast packets  17391 multicast packets  146958 broadcast pack
ets
    159749763812 input packets  95785989605583 bytes
    0 jumbo packets  0 …
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Windows 2012 R2 was installed with all FSMO role & windows essential service. (DC1)
I was having another DC with windows 2016 installed (ADC2)

Windows 2012 R2 was having some issue, so I decided to transfer FSMO roles to ADC2 https://www.dtonias.com/transfer-fsmo-roles-domain-controller/
So I successfully transferred all FSMO role to ADC2

Then I removed Windows essential service (as I was not using it) from DC1.

I forced demoted the DC1 ignoring warning that Certificate service is installed on DC.

I missed backing up CA  as given on :https://social.technet.microsoft.com/Forums/windowsserver/en-US/d922860b-c8cd-4ed5-9b0b-05391c18afc0/demoting-a-domain-controller-with-a-ca-on-it

I never added any certificate on CA. In the network, MS exchange 2013 server is also running that is using public SSL certificate.

Do I need this active directory CA role or service for smooth working of network?
https://community.spiceworks.com/topic/373554-demote-a-dc-with-certificate-authority

Or I should ignore this & proceed to shutdown DC1.
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Can you please let me know what tools or means or how to check below.


Check the health of all Hosts and VM objects in vCenter.  Are there any active alarms in vCenter?  

Are all vCenter plug-ins functioning properly?

If any Host Hardware issues?  Alarms, bad memory, power supply or capacity issues?

if  any resource bottlenecks?  Memory, CPU, Disk, Network?  
 is the load properly distributed?
if running out of resources anywhere?  LUNs with low disk space, etc.  
Check for Firmware updates on Host hardware- can we  use update manager


Check for ESX Patches
Check for VM Patches
Check VMware Tools version
Run scripts to identify the existence of VMs with snapshots and follow up to see if they are still needed.
Have you schmoozed with your Storage Admins lately?  A good idea since you cannot get very far without them.
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Hi, we are looking at some further guidance on setting up failover clustering on two Windows Servers 2019 connecting to a HP MSA2052 SAN.

•      The servers are DL380 Gen10 with 8 NIC ports.
•      The current wiring connections are shown below (we will redo this for redundancy on the controllers)
•      The MSA 2052 has two controllers, each controller has two connections on different subnets connecting to the two servers via one switch with two vlans. (Layer 2 switch)
•      The servers connect to a different production switch for normal data traffic.
•      The iScsi initiators and MPIO have been configured and both servers can see the storage volumes.
•      The Servers can both ping all four ip addresses on the 172.16.*.* subnets, the nics on the 172.16.*.* subnets, don’t have a default gateway configured as per guides we have been reading. Jumbo frames are set up on the iSCSI NICS and switch.
•      The servers are pingable via their full domain name from other devices on the 10.226.*.* production network. The servers are in the correct Server OU.
•      The servers currently don’t have a network setup for a heartbeat and migration.
•      The servers also have Teamed NICs setup for a virtual switch within HyperV manager

The failover clustering invalidate configuration wizard test is failing on:
At least two independent paths to storage target are recommended for each Test Disk
Test Disk 0 from node Server1 (shows FQDN) has 1 usable path to storage target
Test Disk 0 from node Server2 (shows FQDN)…
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Hi Experts,

I know that that there are WiFi Extender products, but my question is not for these products, but rather, how to Extend my WiFi?

My apartment is close to 1200SQFT and used to have Bell Canada Internet Residential, which came  with 5 "Bell Pods" with a "Bell 3000" Router/Modem combo and my WiFi was good.

However, as I run a Web Design business from home, for one project I needed to get Static IP which was not offered through Bell Residential, so I upgraded to Bell Business. It comes with "Bell 2000" instead, but much higher down/upload speed 300/900 mbps. They don't provide the Bell Pods for business, saying that they only provide the bare minimum, and I need to build it up, which makes sense.

My networking aren't that great, but I'm not afraid of Router settings neither. So, my question is how can I extend my WiFi in economical sense. A few years ago, I had Rogers that also provided a Modem/Router combo, but I did add my own router and disable Rogers router feature, so I am able to do that as well if the Bell 2000 allows it.

My Bell is Fiber and the Fiber runs through the room with no WiFi, so I am also wonderig if I can take advantage of that by placing a device there, and then a Fiber extension.?However, currently my router in my office with a lots of wired devices.

I also came across https://www.youtube.com/watch?v=ie4imVwn9vk, which talks about Samsung SmartThings and I like that signal bounces pod to pod and finds the less congested route. …
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Having issues connecting two Windows 10 computers network share. The 'server' won't let one of the computers on the network connect to it. It will however except the IP address share ex. \\192.168.1.2 but not \\computername.
The error that comes up is network path not found. Other computers on the same network can still get to this folder with the server name, but not this one.
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I just introduced a new computer into a domain.
It uses static IP addressing.
It is domain-joined.
One can ping the network but can't access the internet with ping or http/browsers.
nslookup seems to be working fine.

I've removed and reinstalled the NIC and made the proper settings.
The rest of the network computers are fine.

The computer is in the domain and in the computer OU it belongs in.

The domain gateway entered on the NIC is the local DC.
The domain gets internet via a firewall - so that's the gateway for the DC.
The DC is NOT a DHCP server as all the domain computers are given static addresses.
There is a gateway on the LAN running DHCP.
IF this one computer is allowed to get an address via DHCP then it reaches the internet just fine.

TRACERT to a connected subnet host normally results in:
- firewall
- local subnet gateway
- remote subnet router
- remote host

However, with this one computer, the traceroute doesn't work and the first response is ****
However, with this one computer, if we add a persistent route pointing to the remote subnet via the local subnet gateway, the TRACERT result is:
- local subnet gateway
- remote subnet router
- remote host

So, skipping the firewall route for this one computer fixes that one thing.

So, either the DC isn't letting this one computer hit the firewall route
Or, the firewall isn't allowing packets to route further on the LAN for this ONE computer.

How to fix?
I can't even update …
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hi am not able to ping another vm but am able to ping the same vm from another vm
ping23vmping234.PNG
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Hi Expert,

I am having a strange issue with my desktop(Win 10), after using for like 10-15 mins I can't use the network(LAN connection) anymore, but sometimes no issue very random. With different browsers, gaming etc, and I need to restart to resolve.

I have tried ipconfig/all and it's getting IP address. Router and switch all working, interconnect to a switch with a wifi AP and no issue on AP. Appreciate it if any expert can assist me.

Thanks!
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Working through some issues on a Server 2016 Essentials server and noticed that the remote web access portal site (remote,domain.com/remote) is not accessible internally (on the LAN) but works fine externally. If I ping the site internally from the Server 2016 Essentials server, it replies back with the public IP address of the server. This seems correct and matches what we see on other Server 2016 Essentials servers with Anywhere Access/RWA working internally and externally. Likewise, if we compare DNS settings (Forward Lookup Zones) between working and non-working servers, settings appear to be the same.

Internally, if I enter the public IP in a browser, the page does not resolve. Externally, it does resolve, as does the DNS address - remote.domain.com/remote.

Running the Anywhere Access repair wizard did not address the issue. It completes successfully, but does not allow us to access the site internally on the same LAN as the server. Doesn't matter if I try from the server itself or a client workstation.
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I have a simple network, all flat, using default vlan 1 on my LAN.  I do have 2 switches that have a different vlan to separate my camera traffic.


I am implementing 2 more switches, stacked, (vlan 90) that I need them to be able to access the rest of my current network, vlan 1.
I'm going to create the new vlan on the core switch and add an IP address to it.  I know that all my uplink ports need to also be trunk ports,
so it can pass all the vlans,  I'm guessing, all I need to do is add the new vlan on every current switch in my network and that's all I have to do from a
networking standpoint.  I also need to add the IP helper command on my core switch, so I can pass the DHCP info to my DCs.  Am I missing anything else
I need to do?

In regards to my AD, I'm running windows server 2012R2 for all 3 of my domains.  I'm running DHCP and DNS.
So I'm assuming I need to create a new lookup zone for this new vlan and IP range.
Besides that, am I missing anything?  What else would I need to do?

Is there anything else I need to do to make this happen?

vlans
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Internet becomes unusable for all other purposes when running cloud backup.  Cloud backups are very slow.


Before starting a backup to the cloud I start three pings in different command windows on my workstation.

//COMCAST DNS
PING 75.75.75.75 -n 1000  

//GOOGLE
PING 8.8.8.8 -n 1000


//My Gateway before Modem
PING 10.0.0.1 -n 1000


Internal pings come back in about 10ms with 0% loss.

Pings to the external IPs have 0% loss.

Reply from 8.8.8.8: bytes=32 time=28ms TTL=53
Reply from 8.8.8.8: bytes=32 time=24ms TTL=53
Reply from 8.8.8.8: bytes=32 time=20ms TTL=53
Reply from 8.8.8.8: bytes=32 time=27ms TTL=53
Reply from 8.8.8.8: bytes=32 time=22ms TTL=53

I launch the Cloud backup solution.  My internal pings remain constant.  All external pings begin to look like this.

Reply from 8.8.8.8: bytes=32 time=23ms TTL=53
Request timed out.
Reply from 8.8.8.8: bytes=32 time=223ms TTL=53
Reply from 8.8.8.8: bytes=32 time=208ms TTL=53
Reply from 8.8.8.8: bytes=32 time=224ms TTL=53
Reply from 8.8.8.8: bytes=32 time=188ms TTL=53
Reply from 8.8.8.8: bytes=32 time=213ms TTL=53
Reply from 8.8.8.8: bytes=32 time=248ms TTL=53
Request timed out.
Reply from 8.8.8.8: bytes=32 time=244ms TTL=53
Reply from 8.8.8.8: bytes=32 time=248ms TTL=53
Reply from 8.8.8.8: bytes=32 time=239ms TTL=53
Request timed out.
Reply from 8.8.8.8: bytes=32 time=150ms TTL=53
Reply from 8.8.8.8: bytes=32 time=247ms TTL=53
Reply from 8.8.8.8: bytes=32 time=241ms TTL=53
Reply …
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If I create an Outlook 2016 Template and save it, is there an easy way for other people in my local network to access and use this template for their own email use?

Example: The Template simply says "Did You Know" - ES Components has millions of EFI Thin Film Resistors In Stock for immediate delivery!

We want to have everyone in the company to send out their emails during the day with this line
in the body of the email.

Can we do this by using a template and everyone having access to it?

Thank you...
Rick
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Hello everyone,
Today we worked on installing a new server at an office that has around 50 users.  We planned out and deployed a server migration from Server 2008 R2 to Server 2019.  

All worked well, FSMO, DHCP, DNS, everything moved over without a hitch.  After modifing the login script to recognize the new file server, all users were able to login without any problem and access files.

That all changed about an hour later.  A network connection was disconnected from the new server.  And ever since then, the computers have slowed to pas a crawl.

Like it literrally takes 15-20 mins just to LOG IN!  
Once logged in, you simply can't click any applications or even the start menu.  They aren't locked, just every operation takes minutes when they should be mili-seconds.

I started investigating.  One issue I found was the GPO objects didn't move from the old server.  So when I tried to modify them in the GPO manager, it gave errors saying it couldn't be found.  So I copied them out of SYSVOL on that old server.  Great.  I was now able to edit those GPOs.  

I cleaned up some DNS entries, but I cannot find anything in the event log of any of the servers to indicate any problems.  Since the workstations are soooooooooooo slow, I can't even open the event viewer to see what is going on.  Every command I send it, times out.  I can't find any errors in DNS or DCDIAG.  

Please help
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Hi,

I have been asked to evaluate/review approximately 150 servers on our network, ranging from Server 2008 to Server 2019 list in  a spreadsheet with very limited information.   Just primary roles. (e.g. DC, DNS, RODC, SCCM Distribution Point, File and Print server, etc.)   It also lists Hyper-V, Hyper-V on workstation, etc.  

I don't have the owner information so I can't reach out to each and ask "what is this and what's it for?  The objective is to go through this giant list and label each with a "priority #" to either decommission it, upgrade the existing OS, determining the utilization of each server, apps installed, roles installed, etc.   I then need to be able to share my findings with the rest of my team so we can then determine the effort necessary to migrate, upgrade or decommission the server(s) as we look forward to our newest 2016 functional level infrastructure.  Fro example, there are 14 RODCs at branch sites, but Sites and Services is not configured properly, so that could be a priority #1 (through 5) for us.   How do you experts approach these types of tasks and projects?   What do you break things down to and label it as to what should happen to each server and where it should reside, e..g Azure.

Thanks for any information you can provide.
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I have 3 computers on our domain network that are not joined to the network for our camera viewing software.  They are not joined to the domain because I need them to boot up automatically and then they are set to have the camera software to open after a 15 second delay.  If I join it to the domain to use RDP, it requires a password to set up.

Is there a way to connect to the computer through my domain desktop to the system to do maintenance on the computer?  I am trying to avoid having to visit the site for easy fixes when I can do it from my office.
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I am trying to delete a file off a network. I have admin rights and even switch over to use the admin account to try and delete it.

I keep getting the Folder Access denied.

If I go under the folder properties and under the security tab and click advance. I try to change the Owner. It will allow the change until you hit apply. This error message states "unable to set new owner ....access is denied.
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I have a client with a small office.  Their ability to access files on their local fileserver workstation (Windows 10 Pro) is essential.
They use in-office network and VPN client software when in the field.

Internally, there is a simple peer-to-peer network that works well for them.
However, the owner got tied up with Azure AD somehow and now there's a bit of a mess.  It looks like there is single sign-on involved although I really don't know what for and I don't think they do either.

I hadn't paid much attention to their email as it has always worked.  They're on a company domain named Microsoft Exchange account.

I'm not an expert on Microsoft products (Azure, Office, OneDrive, Exchange, etc.) and fear that "cleaning things up" might be more trouble than it's worth.

I'd be very happy to get the boss off AzureAD and to have a single local user to log on to his own workstation.
I just don't want to break:
- email: this must be easy as all of the other users are local users.
- OneDrive

The owner's PC has two logons:
One is an AzureAD\username account.
One is a local account that I set up for user-matching with their fileserver.  The AzureAD\username account doesn't seem likely for doing that.

Today, he did a Windows Update on his PC and lost access to the fileserver in the process.
I have it fixed now but can't say that I did anything at all to make that happen.

In one sense, I'd like to just leave things alone.
On the other hand, I'd like to get …
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Hi Guys,
I'm planning to build a VPN HA.
To do it I must have a 2 firewalls in HA and 2 wan connetions, one via xDSL and one via 4G.
Because the two connections have different IP address, only solution I've found is to configure a DDNS.
What are industrials topology for VPN HA?

Thanks
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I'm running UCS 4.04 and I am not seeing in the GUI where port channels connecting upstream to the LAN are associated with which VLANs.
If I SSH to UCS I can see that the new VLANs I added on the server NICs appear to be (automagically?) appearing on the port channel to
the network. But if I go into LAN Uplinks Manager/VLANs/VLAN Manager I expecting to see the port channels underneath the VLANs with
which they are associated. But that is not the case. From nxos CLI note the VLANs and their association with the uplinks.Perhaps it's the case that if you don't specifically assign a VLAN to an uplink that all VLANs automatially are permitted on those uplinks?

Partial config from connect nxos:

vlan configuration 1,9-11,20,30,32
vlan 1,9-11,20,30,32


interface port-channel2
  description U: Uplink
  switchport mode trunk
  pinning border
  switchport trunk allowed vlan 1,9-11,20,30,32
  speed 10000
 
interface Ethernet1/1
  description U: Uplink
  pinning border
  switchport mode trunk
  switchport trunk allowed vlan 1,9-11,20,30,32
  udld disable
  channel-group 2 mode active
  no shutdown

interface Ethernet1/2
  description U: Uplink
  pinning border
  switchport mode trunk
  switchport trunk allowed vlan 1,9-11,20,30,32
  udld disable
  channel-group 2 mode active
  no shutdown

interface Ethernet1/3
  description U: Uplink
  pinning border
  switchport mode trunk
  switchport trunk allowed vlan 1,9-11,20,30,32
  udld disable
  …
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hello, all

i have an existing ( a little incomplete ) api that allows to send asynchronous calls to a remote resource ( a mysql server over raw sockets without any of the php extensions should that matter ) which allows to send multiple parallel queries to the sql server over regular selectable streams. i know some mysql extensions allow that. i need a regular stream because i want to use other stream resources in the same select loop.

i was thinking i might derive one or several tcp wrapper(s), partly because i'd like a simpler api, and partly because i just happen to like the idea of fopen()ing an sql query to a server

unfortunately, it does not seem that any mechanism would allow a stream_select() call to work properly with such custom wrappers and there is zero use for my api unless it is stream_select()able. it is currently. but not through a wrapper.

nevertheless, some of php's builtin wrappers are properly selectable

is that somehow feasible  with some builtin php mechanics i am unaware of ?
do these wrappers simply push data to descrete files or descriptors in separate threads and let the kernel handle the select, epoll, or whatever mechanism ? ( which is what i would guess )

thanks for sharing your knowlege.

please do not discuss how usefull/useless that is : this is besides the point unless you know of a way to miraculously grab the derived stream resource from mysqli, pdo, or whatever resource

i am obviously also interested in an existing …
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Windows Server DNS not updating
I recently brought a windows 2016 Server into my network. This server was originally configured on a different Subnet but in the same domain. I have already statically assigned a new IP in my subnet.  The problem is the DNS record is still holding on to the old IP. So far this is what I have tried:
Check my network settings and DNS Suffiix.  Ran: (Ipconfig /registerdns)  and (Ipconfig /flushdns) and
I removed the server from the domain and added it back.
I check my Event logs and I do see that my DNS request is getting rejected but I’m not sure if it’s getting rejected from the DNS Server side. I don’t have admin access to the DNS Servers to see if the request is coming from the server with the problem. Here is the error I got:

The system failed to register host (A or AAAA) resource records (RRs) for network adapter
with settings:  Adapter Name : {K8A99A7D-48A1-5343-A82D-CDE738DD9A3D}
           Host Name : test-Server2K16SA
           Primary Domain Suffix : ABC.com
           DNS server list :
               X.X.X.X, X.X.X.X
           Sent update to server : <?>
           IP Address(es) :
             (New IP address)

The reason the system could not register these RRs was because the DNS server contacted refused the update request. The reasons for this might be (a) you are not allowed to update the specified DNS domain name, or (b) because the DNS server authoritative for this name does not support the DNS dynamic …
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All of a sudden computers with windows 10 pro in the network are having all kinds of issues printing to our 4 Savin copiers.  I have tested out 2 old win 7 pro machines and everything is fine.  I assume it is a driver issue that needs to be updated.  Here is the question:  These printers were added to computers by ip address and then browsing for the correct driver on a network shared folder.  If I do find the right driver do I need to update all the machines indivudually or is there a way to do that on the Savin printer/copier side and then all of the computers will use the correct driver?
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The customer has a small and simple shared networking setup consisting of a few Win 10 Pro computers.  His computer out in the warehouse is named "Gin".  The Norton firewall is set up so his computer can be accessed.  If I go to a command prompt on that computer I can "ping gin" and get the expected responses.  I can also successfully ping the IP address of this computer as "ping 192.1687.254.21".

But if I go to any of the Win 10 Pro office computers I can ping the IP address of 192.168.254.21 successfully, but I cannot "ping gin".  When I try it, I get this response:

Pinging gin.Home [192.168.254.26]
Reply from 192.168.254.25: Destination host unreachable.

Why does it say "gin.Home"?  Why is it showing those addresses that end in .25 and .26 instead of the .21?  How can I "ping gin" like I need to?  TIA
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Following a Windows Server migration, one computer does not see any mapped drives in various software  where they should (and used to) appear.
Other computers in the same domain do display the mapped drives.  This is in cases where you're browsing for folders in drop down boxes like if you're importing a file.
I have seen this before as in partial or missing network objects, but don't know where this is governed from.
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Networking

95K

Solutions

68K

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.