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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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I have installed a DC server (Windows Server 2016) in parallel to SBS server, to replace SBS. But, somehow I couldn't connect with shares on new server from any domain computer. I can still ping the new DC but I can browser shares. Error: Network resource is unavailable.

I checked the firewall inbound rules, form SMB to TCP. Its blocked and I couldn;t find any way to turn it on. Its says its controlled by system administrator.

Any help will be much appriciated
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Hi all! I'm having an issue with our SCCM Current Branch server when it comes to downloading updates. I am a new Network Engineer so any help would be greatly appreciated.

Situation: So I have a software Update Group already created with what updates I want it to download. When I try to download those updates I get the error as seen in the attachment.

So what can I do to help resolve this issue?
Error-SCCM.PNG
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1.pngso all of a sudden some emails stop flowing and my connector is not validating, been setup for years and we did not change any server or network settings

i have Office 365 and a hybrid server - exchange 2010

the emails that are failing are coming from my mercury server and flows thru my exchange to office 365. i have contacted microsoft support but they are saying its an internal issue.
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Hi..
in a python script how can i get all the ip address of  the DNS servers on the network.

Thank you for your help.
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I used clickonce in .NET to create an install and pushed it to the server.  When clicking on the link I receive the below error.

Downloading https://xxxxxcom/xxxxx/xxxxx.application did not succeed.
+ The request was aborted: Could not create SSL/TLS secure channel.

Any ideas?
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We have multiple rural locations that need to connect with relatively low latency.  We have two locations that have a dedicated connection between as it is the same service provider.  The other locations have different network service providers.  We have used VPNs over public Internet but that has not worked well.  We are in the process of using Microsoft Azure for certain services.  My question is this:  If we were able to get dedicated connections to Azure at all our locations, can we enable network communication between all sites?  Would this allow for a stable "low" latency connection between them?  Any information would be appreciated.
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Hello gents,

I am at a customer site and they have a server in the internal zone, the network has Cisco ASA firewall.

They have a developer and on the server he wants to open ports 7000-7200, Do I use the Cisco ASA to open these ports ? or is this done on the server only.

I am not sure how to address this I need clarity on such type of requests from clients,

Thanks,
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Hi,

I have a problem regarding the USB selective suspend feature. I want to disable selective suspend on multiple computers throughout my network. Is this possible via gpo? If so, how can I achieve that?

Thank you in advance!

Bernhard
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Hi,

I would like to connect my laptop to our business network when I'm outise the office.
for doing this, I'm using the software Schrew to connect to the modem Lancom whose adress is 192.168.0.254
Behind the lancom there is a Win 2008 R2 sp1 server for the dhcp. its adress is 192.168.0.246
The VPN server is the Lancom.
Connect VPN is OK and i can ping whole the network.
The issue is when i want to get e-mail. Outlook can't connect to the Exchange Server running on the 192.168.0.246.

Can some help.
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Is there a quick and simple way with minimal impacts to migrate Users from Microsoft Internet Authentication Services (Windows RADIUS, Server 2003) to Network Policy Server (NPS, Server 2012)?
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Best way to configure spanning tree on HP Procurve switches

What switch should be the root? Best Practice?

Thanks
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I am trying to add a VMware ESXi 6.5 host with 3 virtual machines to our network and I am having an issue with the routing.  

The network is divided up into several vLans.   the two I am using are vlan100 for servers and vlan200 for desktops.   There is route between vLan100 and vLan200.  Machines on one can see machines on the other.  

We are using layer 2 switches and a layer 3 router.

vLan 100 is configured with port 1 tagged and attached to the router.   Ports 2-24 are untagged.   PVID is set to 100 on all ports
vLan 200 is configued with port 25 tagged and attached to the router.  Ports 26-48 are untagged.  PVID is set to 200 on all ports
Routes have been added to the router to pass traffic between vLan100 and vLan200

Workstations are all connected to vLan 200 and our servers are connected to vLan100.   Using all physical machines i have no issues and everything works fine.   I wanted to add a VMware ESXi server on which I have configured 3 servers.   I attached it to port 15 and as able to ping it from computers connected to vLan100 but not from vLan200.   I tagged port 15 and added vLan100 to the ESXi host with the same results.  

How do I get the workstations on vLan200 to communicate the virtual machines on my ESXi host?Network layout summaryESXi vswitch Layout
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I am designing a network for a new building. There will be a main server room and 5 IDFs. In each IDF I want to have as much redundancy as possible, so in each IDF there will be 2 XG/aggregate switches. The idea is that no matter how many 48-port switches are in a cabinet, EACH one will connect to 2 XG switches (one fiber cable to each). Then, to get from one IDF to the next, each XG switch in turn will have a dedicated fiber connection to the other XG switch in the next cabinet. The IDFs are connected in a star topology, meaning one "central" IDF has 2 fiber connections to each of the other 4 IDFs - one in each corner of the building. So the redundancy here is that every 48 port switch itself is connected to 2 XG switches, and in turn every IDF has 2 paths to the central IDF.

Here is a partial diagram to illustrate what I mean:

Partial Network Diagram
 

 

The red lines indicate fiber connections.
The blue lines also indicate fiber connections but may be overkill (Within each IDF, a single fiber cable connects the 2 XG switches to each other)

I am using RSTP on all switches, with the default settings except I made the following change:  I gave each of the 48-port switches a priority of "32,768" while all of the 16-port switches have a priority of "16,384". My assumption is that STP will choose each XG switch over a 48 port switch when building out its path (but I suspect there is more to it than that)

A few questions:

1. Is "Priority" the same as …
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I have a mac book pro that since Thursday, all of a sudden, it disconnects from the LAN.  The wifi works fine.
I replaced the network cable and the 5 port switch that it was plugged into. I have also tried a different computer with the same cable, and
it didn't disconnect with a different computer.   Since a different computer works fine with the same network cable, I'm thinking there's an issue with the MAC.

I don't use MACs much, so suggestions I can try to isolate the issue?

I'm currently using DHCP with windows servers.  I have about another 9 or 10 MACs on the network, and no one else reported any issues just yet.

Thanks. D
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Our development team has an app called adflow. They upload documents through adflow and it automatically puts into their specified network folder on prem the document/attachment. Recently it has been appearing and then disappearing. If you disconnect the drive and connect it the documents appear again. Has anyone heard or seen anything like this?

We have all the folders set to Modify.
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I have a VLAN network that is out of IP addresses. We have to stay on IPv4 for a number of reasons, so I think the best way to fix the issue is to add a subnet range. The current subnet is 192.168.4.0 and I would add a subnet 192.168.5.0, then move all of the statically assigned devices to that network.... which should avoid the complexities of setting up DHCP and IP helpers on the switches. There are some other subnets and VLAN's configured as well, and the switches are stacked. The switches are Aruba L3 switches. Here are the VLAN setups- Subnets's 3rd octets match the VLAN ID for the 192.x.x.x networks:
VLAN ID         Name              IP
1                       DEFAULT        192.168.4.253
         Tagged:  1/37,1/43-1/44,2/45-2/48,3/4,3/6
         Untagged: 1/1-1/10,1/12-1/17,1/19,1/21-1/34,1/36,1/38-1/42,1/45-1/48,1/A1-1/A2,2/1-2/44,3/1-3/3,3/5,3/7-3/24
2                       VoIP                 172.16.x.xx
         Tagged: 1/1-1/48,1/A1-1/A2,2/1-2/48,3/1-3/3,3/7-3/24
         Untagged: 3/4,3/6
5                       Facility2           192.168.5.254
         Tagged: 1/17
         Untagged: 1/11,1/18,1/20,1/37
7                       Facility3           192.168.7.254
          Tagged: 1/45
          Untagged: 1/35
8                       Facility4           192.168.8.254
          Tagged: 1/46
          Untagged: 1/43


So, I am not touching the VoIP network.
The 5 VLAN is the one I have set up, but I am unclear on the whole tagging versus …
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All - going through a security audit and that are asking us to implement controls to  prevent bridging, multi-homing and split tunneling.

we have lots of engineers both on Macs and PC's using VirtualBox and VMWare with network bridging and NATing also, has anyone ever deal with a request like this?
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Windows 10 Laptop, Lenovo Thinkpad having internet / network connection issues on a regular basis, also can't seem to sync photos from an iPhone 7 into Windows 10. I have found that there is some sort of networking issues on this laptop. Anywhere from 5 minutes into using the computer up to 2 hours after its rebooted the laptop will just stop communicating on the network/ internet.   The yellow icon comes up on the computer wireless adapter. Then sometimes 5-10 minutes later, the icon goes away and the computer starts to operating just fine again.     I started two pings, one to 8.8.8.8 and one to 4.2.2.2. Both ran for about 1.25 hours  and while I had some timeouts, I didn't lose connectivity at all.    I left, then the client called me back and said the machine isn't working again.    She had connected her iPhone 7 to the computer to transfer photos and the machine errors out in Windows Photos app saying it can't find the phone. What I wonder is if the iphone tethered to the computer caused it to try to use it as a source for internet.   I remotely connected to the system from home, I see the issues happening when the iPhone is plugged in to the laptop. I can't transfer photos using the Photos app.
But then I see that iTunes is accessing the phone, perhaps that is why.

So I closed the iTunes, and sometimes it works, sometimes it doesn't. I can see the iPhone from my computer.
I can go into the DKIM folder, I see items in there, but I can't copy them and past them to…
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I need to find out why are there devices in my network that do not belong to me? Why do they appear here? How can I stop them them from appearing on my network. Is my computer being compromised? Please help.


Network-Foreign-Devices.pdf
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How to force internet traffic from 2 x specific 'Guest' VLans on an Aruba Wireless Controller to forward to the DMZ VLan?

I thought about setting up a static route 0.0.0.0 / 0.0.0.0  to point to the DMZ Gateway IP address.

But I do not want the other VLans (company / employee related) to have their internet traffic through the DMZ.  Is that possible?  Or must all Internet traffic be routed to the DMZ and then routed back?  I am sure there is a way to do this.  In the older wireless system the Wireless controller's default route was set to the DMZ gateway.  That is telling me that all unknown traffic is forwarded to the DMZ(internet).

On the older wireless controller there are static routes set for company specific network traffic to use the default Vlan Default Gateway (Internal IP address).  The only problem that I see for setting up 0.0.0.0 / 0.0.0.0 to the DMZ is that I will need to setup a static route on the DMZ to send traffic right back to the controller(s)?  Unless I can only forward 0.0.0.0 traffic from specific Vlans to the DMZ?  Is that possible?

How can I force Internet-only traffic for 2 specific IP based VLans to be routed to the DMZ VLan and to let eveythign else use the normal company routing?  

We are using Aruba 7030 controllers and we can assign an extra/available port to connect directly to the DMZ VLan if necessary.
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Hi Geeks,

I am into presales . Many times we are loosing deals against other partners (for same vendor like cisco, fortinet)  sometimes they had protection for deal and sometimes even we had protection from vendors.

Want to get some creative suggestions from you geeks... now a days competition is like hell.....  please advise for below....

1) when we had deal registration approved /protected for us, what tactics / ideas  shall we play to make RFP so that we maximum the our chances of winning.
2) when we DO NOT have deal registration approved /protected for us (someone else has worked on RFP) , what tactics / ideas shall we play so that we maximum the our chances of winning.
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Recently we receive one project, we found that that is unusual network setup because the given the router TP-Link AC1200. Usually we are using MSR930 or Cisco Router as WAN router so that we can use the Public LAN IP given by ISP in our network (Scenario 1).
To overcome this issue, we are connecting the ONT to our Firewall WAN port directly and now we are thinking how to use the public LAN IP for our devices. Someone is said we can create VLAN or secondary IP, but I don’t have any experience for this setup
I hope that some expert can advise which is correct option and how-to setup in our SonicWALL TZ600.Thanks
Case-Study.pdf
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Hi,
I would like to understand this process a bit more and the authentication flow.  Using ClearPass (similar to ISE) as a RADIUS server.

PC authenticates successfully via dot1x (EAP-TLS) when plugged into jack.  However, when plugged in via VoIP, it fails.   Discovered that the pC is not able to auth via MAB because the MAC is not in the MAC Address table.   Once added MAC to MAC Address table, PC successfully authenticates via dot1x and MAB.

What is the relation to VoIP here?  If the PC can auth successfully via dot1x(EAP-TLS) on its own, what triggers the PC to roll over to MAB and fail?
1
It is a SBS 2011 domain for what it is worth. The HP Smart app on the iPad see all network printers (there are about 20 of them). Absolutely no problem printing to OfficeJet 8600 but it just won't print to a LaserJet 402dne (it is a monochrome lasser. It goes through all the paces, says it is printing but nothing comes out the printer. No indication that anything makes it to the printer.

   Both printers have Bonjour on them. The 402dne must need a little something else to get it to print. Any ideas?
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Run connection test "telnet port 53" failed, is the 23 or 53 port connection issue? How to verify?
0

Networking

93K

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.