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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Gurus ,

i am looking for a reliable solution for a home network to terminate ADSL connection  and was wondering if Microtik will be a good choice for one time installation by a professional and the unit can work without any reboot / hang unlike experiencing in Dlink / linksys some of the models

Regards
Aaron
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OWASP: Forgery and Phishing
LVL 13
OWASP: Forgery and Phishing

Learn the techniques to avoid forgery and phishing attacks and the types of attacks an application or network may face.

Hi,

I have an ESXi 5.1 server with just one virtual switch for management network, iSCSI traffic vs storage and VM connectivity.
Both physical NICs of this server  are connected to Cisco switch on access ports.

I noticed on my switch several messages like this:

%SW_MATM-4-MACFLAP_NOTIF: Host xxxx in vlan 100 is flapping between port Gi0/9 and port Gi0/10
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx in vlan 100 is flapping between port Gi0/10 and port Gi0/9

Open in new window


I checked this URL:

https://kb.vmware.com/s/article/1012819

but I am not using neither Etherchannel nor Network failover detection with Beacon probing.
On virtual switch (ESXi) traffic shaping is configured with "Route based on source MAC hash", with both interfaces in Active, so I wouldn't expect flapping since VM's mac address are static.

How can I avoid flapping?
I think I could simply put one network interface in standby mode.. but I'd need to check how much traffic is on that link.
Thank you!
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I have a 3850-24XU-S switch, it's new, it has more ports in the config than physical ports.  As you can see, I don't even have any network modules installed.
Is there a way to remove them from the configuration, or should I remove them? Looks like there are 40GB ports, but I think I need to install a network module with
40GB ports, right, so if I leave the switch the way it is, can I remove any ports past te1/0/24 ?

Where do I find ports te1/1/1?   Or Fortygigabit 1/1/1 ports?
ports
switches
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How safe (from viruses, malware, etc.) is working from home (using home ISP w/Wi-Fi) on a work laptop if the employee uses a VPN client to connect to the office network resources?

If this is safe and the only time an employee operates their work laptop on a home network is for work purposes via VPN and not for personal use, how do I explain this to managers in English they can understand?
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I have been asked to setup email for a new company that has outsourced the building of their website.  The website company has not fully configured the new domain of my new company and has asked me if I could go ahead and create the desired email accounts with the DNS method??  I am not a network person and don't have the experience to do this, if it is possible.  Can anyone tell me how you setup new email accounts without using a C-panel or hosting company and by utilizing DNS?  Thank you very much!

Please let me know if you require any additional information from me.  Thank you
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I have 2 NICs on my blade. One NIC has connection to the internet and the other has connection to the internal network. The two connections are on entirely different network. When I have Ethernet cable connect to the internal NIC, I can get access site on the internal network using internal DNS. However, when I have Ethernet cable connect to the internet NIC, the internal site can no longer work. Is there a way that I can get access to both the internal network and internet on 2 separate network connection connected at the same time?
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EE Members,

Hello all . could you please advise of any vendors that does Out of Band Solution through 4G ?
looking for reliable vendors that has presence in Middle East

Regards,
Sid
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I am moving some roles from a physical server to a virtual server and was wondering what the order of operations should be. I have a physical server that is a domain controller (no fsmo roles), network policy server and a certificate server. I will have the same roles on the virtual server. Both servers are running Windows 2016.
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We have site A connected to site B with a pair of fiber.  The fiber is muxed with CWDM at each site. We also have site C and site D with the same setup (muxed between the sites with CWDM). Now we like to extend one of the wavelength (1511nm) from site A to site D. Is there going to be any issue if we mux it twice (i.e. between site A and B and then between site C and D)? It looks something like below. I would like to know if it's an acceptable solution

Site A                                                 Site B                               Site C                            Site D
1511nm-----CWDM-------mux-------CWDM-----1511nm------CWDM-------mux-------CWDM-----1511nm

Thank you,
0
Is there a way to remotely configure the Gateway for multiple machines at once?  Maybe a GPO or Power Shell Script?
0
Introduction to Web Design
LVL 13
Introduction to Web Design

Develop a strong foundation and understanding of web design by learning HTML, CSS, and additional tools to help you develop your own website.

I have a copier that can scan documents and write the file to a Shared folder.  It requires a account that has permissions to access the Network Share.  What type of account would I setup to get the copier access to write the file to that share ?  I believe the TP its using is SMB.  Can any help please, and tell me how to accomplish this.

Thank you in Advance.


Mark H.
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I’m deploying a few network printer in small environment. I have a firewall and a couple switches and a Windows DHCP/DNS server. Is it best to create a new IP range for printers and would that translate to creating a new subnet? Also I heard it’s better for DHCP reservation than to do static IP for printers. Any advice/teaching suggestions here appreciated.
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OMG: This is driving me crazy!!!!

A user keeps getting his AD account locked every 20 minutes.

I've googled this to death, and even reached out to our ManageEngine AD Audit techs.

In a nutshell, Microsoft isn't capturing the source machine name or IP if the logon request is not from the MS platform (linux/mac) or the authentication request isn't Kerberos.

How in the world am I supposed to figure out the offending machine?

Using this command, then stopping and starting the logon service:
nltest /dbflag:0x2080ffff

The widows\debug log reveals:
07/09 14:38:14 [LOGON] [4304] ECPHFD: SamLogon: Transitive Network logon of (null)\victim_user@ourdomain.com from (none) (via DC-2008-01) Entered
07/09 14:38:14 [LOGON] [4304] ECPHFD: SamLogon: Transitive Network logon of (null)\victim_user@ourdomain.com from (none) (via DC-2008-01) Returns 0xC000006A

"(NONE)" is NOT HELPFUL Microsoft !!!

I've ruled out that these are coming from the outside world so I'm left thinking this is a malicious internal brute force attack or a forgotten app using the user's old password.  We've shut down all of his devices and the problem persists.

#HELP!

Any ideas would be very much appreciated!

Helplessly yours,
Mike
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When deploying printers via GPO, what are the major differences between deploying via policy vs deploying via user preferences? Is there any major advantage of one over the other.

Printers GPO, Preferences vs Policy
In this example this is a flat network, no requirement for item level targeting.

I would however like to be able to update the printer drivers if needed in the future, so how can this be achieved?
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On a server 2012 R@ network with all Workstations running Windows 10 PRO, I have ran into a profile issue when upgrading.  The computers are all roaming profile.
The workstations would fail to upgrade from 1803 to 1809.  The resolution seemed to be to run the trouble shooter for updates.  It would do repairs, and free up several updates.  Windows then offered 1903 as a download to bring the computers up to date.

The move from 1803 directly to 1903 seemed to go very smoothly.

The challenge is that after the requested restart, the computer will not allow access to the start menu or any commands such as windows explorer.  Programs will start if there is a shortcut on the desktop, but will not start if the start option is in the task bar or start menu.  An error pops up indicating the user does not have permissions to use what ever item one is trying.

My thought is to disconnect the computer from the network and do a forced shut down, the log back into the computer in either local mode or at least not connected to the network.  The data is preserved on the server, and by not connecting to the network for log on or log off, the data on the server will not be overwritten.  I will then either roll back to the previous version, or restore the workstation.

I am discouraged that the update process suggested updating to 1903, and then failed.  

Is there anything that can be done to repair the profile?  I do not know if there are any logs available as I have not been able…
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She is on a domain. This spreadsheet is on a server. I have check her rights on this file until I am blue in the face. She has full access. Is the attached an Excel Error or a Network Error?
Capture.PNG
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OK. This is going to be simple for those who are into networking and VLANs.
We recently got fiber from our ISP.
After media converter, we have one LAN cable.

It carries two VLANs.
VLAN 308 internet service for the entire company
VLAN 309 l2vpn service to connect to remote office

I need to configure my L2 SW and router in HQ to untangle this.
Our default VLAN is 1.

Can someone please provide the simplest solution on how to configure ports on SW/router?
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I am looking for a good terminal server that is compatible with cisco switches, mostly 2960X's and 3850's.
I need at least 40 ports.

Any suggestions?
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Hello All,

I have a computer that has lost its trust relationship with a 2016 server.  I can login when the network cable is unplugged but I can't get into the advanced system settings because the local admin was disabled on the machine.  Since the system can't find the domain and I can't get into the nic card to set any static info without being an admin I can't get it to reconnect to the domain.  I have already tried resetting the computer account and removing it and adding it manually in ADUC.  Is there anything else I can try?

Regards,

Rob
0
OWASP: Threats Fundamentals
LVL 13
OWASP: Threats Fundamentals

Learn the top ten threats that are present in modern web-application development and how to protect your business from them.

Need some advise.

Is a LOCAL FILE DSN (ODBC to a SQL Server) a better solution than a NETWORK BASED FILE, SYSTEM or MACHINE DSN?

To access the application --the users click on a desktop shortcut - I use Robocopy to copy the front-end to a local folder (if it has changed) -- and then open it. I was thinking I would add a copy of the FILE DSN in the same batch file so the users always had the most current copy available locally.

When I tested the batch file the permissions didn't copy down so none of the data was editable -- when I manually changed the DSN file permissions -- the data became editable using that DSN.

I have a client with a mixed (OS and Office) environment and multiple locations. The remote location users VPN in which is causing a slew of other issues - but my focus in in making the Access apps play nice with the SQL Server (v 17.9.1).

They have a SQL Server 2008 R2 Standard presently - but are installing a Windows Server 2019 Standard with updated SQL Server software v. 18 -- and I'm in the process of migrating data over -- but because of the remote locations and the performance (very poor where the database is concerned - and frequently locks up) -- I'm looking for suggestions.
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I am frequently required to set up a Windows DHCP server to service multiple subnets, typically on different VLANs. Many times I have the option of setting the server up with multiple NICs or to use a single IP address and configure DHCP relay(s) on the router to route the DHCP requests from the various VLANs to it.
I always go with DHCP relays, but I was just curious: are there any advantages to one option or the other? I'd imagine that if you are dealing with a very large number of VLANs then DHCP relays would be the way to go. But if you have 3-4 extra ports on the server, would it be advantageous to use the physical NICs instead?
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I'm going to be converting a set of interconnected Workgroups/Subnets into a Domain/Site/Subnet arrangement.
As this evolves (for a number of good reasons), there will be a Domain sites/subnets and there will be Workgroup sites/subnets.

While in this interim state, in at least one case, there will be Workgroup file folder shares that need to be accessed by a set of Domain Users.

What's the best way to do this?
For example, I can set up a Local Group on the workstation and give share access to the group.  But how does this help the Domain Users?  That's what I'm missing here.....
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I am having an issue with my remote VPN users not being able to connect to a specific network through the VPN.   Hardware involved is a Cisco ASA 5505 with users connecting using Cisco Anyconnect Client.  Once connected the ASA assigns them an IP address from a pool created on the ASA. (172.16.10.0/24), Split Tunneling is enable and the internal network and the remote network(details below) have been added to the network list for the AnyConnect connection profile.  The VPN users can access the internal network without any problems but not the remote network.  The problem is below.

Details of the issue:  There is a server on one of our vendors network that we need access to internally and also when connected through VPN.  A site to site VPN was setup connecting my internal network(172.16.3.0/24) to theirs(10.*.*.0/24) and what I believe to be all the needed ACLs and NAT entries.  All internal users can access this network without a problem but anyone connected by VPN cannot.  It seems that on the VPN users computers that any traffic destined for my internal network comes through the VPN but traffic trying to go to the vendors network is going out their regular internet connection and not through the VPN.  Looking at the settings on the AnyConnect client while connected and looking at the route details tab it shows the 172.16.3.0/24 network and the 10.*.*.0/24 network as secured routes.  Any ideas on what could be the issue?  There has to be some NAT or ACL rule I'm missing …
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I am running Hyper-V with 6 virtual machines.  One virtual machine is running MSSQL Server 2012.  The network speed for 4 of the servers connecting to the sql server are the same but the 5th server's connecting to the SQL server takes about twice as long.

When I open the Hyper-V manager and look at the network adapter settings for the slow connecting machine, the settings are identical to the other machines.
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I have 6 switches (2960X-48FPD-L) in a stack.  When I do a show ip int brief, the ports start at gi2/0/1 and ends at gi6/0/50.
I am missing 1 switch of ports, 48 ports.  Not sure if I am doing something wrong, but how do I get a whole switch to come up, and how can I identify
which switch ports have issues?

ports
Then I did a show switch, and noticed one of the switches  under current state says "version mismatch", would that cause this issue?
Does that mean I have to remove that switch from the stack and replace it?  Would that even cause this issue?

v
0

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.