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 guys ,

I got a Cisco 547w router. Which does have a adsl connection.
For some reason. When I enter my wan ip in browser, it connects to my router page.
Is there any option to disable it ? I don’t need to access it with my wan ip. And it happens only inside the internal network.

From external it doesn’t work that way, because remote management is disabled. But for some reason when am inside the network I can access it with both private and public up.

Can u guys help how to disable the access through public ip?

Thank you
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PMI ACP® Project Management
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PMI ACP® Project Management

Prepare for the PMI Agile Certified Practitioner (PMI-ACP)® exam, which formally recognizes your knowledge of agile principles and your skill with agile techniques.

Hello Experts,

I want to restrict available network interfaces for (automatic) bridged networks in VMWare Workstation 14 for the end user. The virtual network editor required Admin privileges to create new network interfaces. But, a user can easily change a host only to bridged or NAT or vice-versa without Admin privileges.

Any ideas on how to?

Thanks in advance.

Kaps
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Server 2012 stuck in boot loop. Server gets all the way to ctl-alt-dlt and then promptly reboots. Can boot into safe mode, and safe mode with networking. Server eventually boots and stays on. Inherited this system from someone else. System has a Raid 1 and both driver do the same thing.

Cleared windows update file, reset network connections, removed antivirus, removed logmein (sometimes logmein causes this.)
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regarding the type of vlan trunk mode. what are your benefits on a virtualized platform?
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I have 1 aruba 2930F 48G 4SFP+, 2 24G POE+ 4SFP+ switches. How should I stack them?
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Looking for a Lender who specializes in the Purchases of Computer companies.

Growth is going well but I wish to obtain 30-50 clients in a purchase.

Out in California.
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I am wanting to upgrade my home to a smart home. However, I don't want everything wifi or wirelessly controlled. I'm looking to be able to control everything VIA Siri, Homekit or Alexa. My first thought was smart outlets with LAN connections, since I have to wire my house anyway, but I can't seem to find any wall outlets that will completely replace the current outlets. I want then to have a LAN connection (whether male or female) and connect into my home network wired.

Please tell me that they exist, and where they can be found. :) thanks
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I am using an Access 2016 split database with the backend table on a network folder. The front ends are on each computer. That said, when I try to open the tables in my front end, I am getting an error saying "recordsets are not updateable". Further, if I try to open the tables with another user using the tables from another computer, I get locked out.
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Cisco RV345 router in a static IP mode.
ISP gives me IPs of   x.y.z.232 /29 with gateway x.y.z.233
I set RV345 WAN as x.y.z.234 /29

Now I try to define a globally known address using a VLAN to connect a server:
  so maybe a server at x.y.z.236 with an interface on a port asdsigned to VLAN1.
  VLAN 1: IP x.y.z.235 /29  and the RV345 gives a red box and won't allow it.
  because I am not so smart, I try /30 and it also errors
  Tried other IPs, x.y.z.236 through x.y.z.238 and they all fail
  Any IP OUTSIDE the router's WAN range x.y.z.232 /29 is allowed.

I want the server's IP to be one of the ISP assigned values, but the RV345 seems to prevent it.
What am I missing here?
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Hello

I'm having an issue with setting up an IIS FTP server (on a 2008R2 box). I have succeeded in setting up the server, users, publish the directory, setup NAT on the firewall. Things are looking pretty much ok but I am struggling at this point:

 220 Microsoft FTP Service
AUTH TLS
234 AUTH command ok. Expecting TLS Negotiation.
USER username
331 Password required for username.
PASS *****************
230 User logged in.
PBSZ 0
200 PBSZ command successful.
PROT P
200 PROT command successful.
FEAT
211-Extended features supported:
 LANG EN*
 UTF8
 AUTH TLS;TLS-C;SSL;TLS-P;
 PBSZ
 PROT C;P;
 CCC
 HOST
 SIZE
 MDTM
 REST STREAM
211 END
OPTS UTF8 ON
200 OPTS UTF8 command successful - UTF8 encoding now ON.
SYST
215 Windows_NT
PWD
257 "/" is current directory.
CWD /
250 CWD command successful.
TYPE A
200 Type set to A.
PORT 172,16,101,102,208,219
501 Server cannot accept argument.
CWD /
250 CWD command successful.
TYPE A
200 Type set to A.
PORT 172,16,101,102,208,222
501 Server cannot accept argument.

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I guess this is somehow linked to passive FTP mode but
  • it happens even if I explicitly request active mode only
  • I have defined the passive ports in the "FTP firewall support" tab and NAT-ed them to the correct internal IP
  • this works fine if connecting locally (localhost) but not from LAN no WAN

I'm sure it is a "classic" one (seeing lots of post googling this) but can't really figure it out.

Any advice most appreciated
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I had a colleague recently turn on Distributed File-system in our organisation in order to replicate company documents.

Could this also be used to replicate printers, and also could this be the cause of printers disappearing on our network?
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We have a client with three sites, all three sites connect to an azure server however one site's LAN to LAN connection isn't connecting to Azure.
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Hello all,

This is gonna be a long one but i'll try to keep it short enough :)

Our client was using and old SBS 2011 and a SERVER 2012 Standard that is running a custom application.
The application is using SQL express 2012 but its an old application that has no support on it.
(both virtual servers are running on ESXI 6.0.0, 2494585)

So we migrated the SBS 2011 to a SERVER 2016 Standard but since the migration our client is getting network errors in
the application that was running on the existing Server 2012.  They are getting errors like "Cannot find part of path X:\Data\Locks" and "an unknow network error has occured".
Sometimes the error will only show after 4hours, then after 8hours, then after 2minutes of 15minutes, without any pattern or anything I can test on.
No error logs are being made by the application or the server. And we have no support anymore from the creator of the application.

As far as I can see the network share is always available. Altho I got a few reports from the client that the X:\ share had a red cross on it,
but only for a second then it was available again. I however never see this during my tests.

Are there any know situations that cause network errors after a migration to a new DC ?
I'm not getting any DNS or DHCP errors.

To be sure, here is some more info:

We migrated the Exchange 2010 to Office 365, moved all the roles, data, dns, dhcp to the new server but we did not touch
the server 2012 that was running …
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I have a client with a LAN, using a Cisco router, and then, in another area of the building I have a D-Link router set up as a wireless access point only (no wired connection to D-Link WAN port, DHCP off).

They want to add a guest network that is isolated from the private LAN.  If I enable the guest network on the D-Link it doesn't work, presumably because the Guest network is trying to go out through the WAN port directly, which isn't used because I've got it configured as an AP only.

If I add another router to handle Guest, in order to get the isolation I need from the company's private LAN, I've had to use 2 additional routers to get the isolation.  Is this the way to go, or is there something better that I can do?

Thanks.
Dave
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We've just installed a new next-gen firewall and I need some assistance getting some communication between two of the interfaces.
It's a Watchguard T35 and we have our WAN on Eth0, LAN1 on Eth1, and LAN2 on Eth2.
Our WAN has a static IP, but we have /27 block of public IP's routed (at the ISP level) to our WAN for use by public facing servers.

I have that part of it working OK.  Servers connected to the LAN2 all have their static IP assignment and IP checks on the internet show the correct IPs.  This interface in the Watchguard is set as "Optional".

LAN1, is our private LAN and is set as "Trust".  Internet traffic and NAT/port forwarding is all working OK, but I cannot seem to get access to LAN2 from LAN1 devices.

I've created a firewall policy with "ANY" for the packet filtering and have set both 192.168.1.0/24 and 203.xx.xx.0/27 in both the To and From boxes.  The rule is set to allow and enabled.
But I cannot browse (using the IP or UNC name) or access any of the LAN2 resources from LAN1.  Nor can LAN2 access any of the LAN1 resources.

I'm new to Watchguard and thought I might ask here for any things I may have overlooked before lodging a support ticket with Watchguard support.
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I have a very old 2U LaCie Ethernet Disk which has a proprietary Windows XP Embedded software installed. I recently moved it from one physical location to another in a server rack and since then can no longer access it over the network as it won't accept the network credentials.

LaCie-XP-Embedded.JPG
I can connect a KB/Mouse and monitor to the machine and see it boot up, I can then input the admin username/pw and boot into this special XP Embedded. I can see the data on the drive via a "Backup Wizard" but there is no traditional windows explorer.

XP-Embedded-File-System.jpg
There are no diagnostic issues present on the drive and the firewall for the drive is completely disabled. I can even connect to this drive via Remote Desktop Connection and see the same as if I connect directly.

However, if I try to access the drive contents via a networked computer using the IP address in order to map the drive... I'm presented with the prompt to Enter network credentials but it won't accept the admin password at this point, despite accepting those same credentials on login and via Remote Desktop Connection. I know the credentials are right because it's the same admin credentials for all of our network drives.

The disk itself is visible/detectable via the LaCie network assistant but it displays a message that it "Cannot list the device volumes. See the [web] Dashboard for more information." Clicking on the provided button to open the web access dashboard opens my browser …
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We seem to have a problem with one of our machines on the network it seems to be sending out spam. Is their a way to find out what machine this on from the exchange server. We have exchange server 2016,
1
Hi Experts,

on one of my network segments I use a DHCP server.
Now I have to install WLAN for GUESTs and I want to use another VLAN.
How to configure my DHCP server to serve also my VLAN ?
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I have an interesting problem.  From my domain server I am UNABLE to ping one of our clients.  But from the client computer I am able to ping the domain server.  How is it possible that its a one way ping success but not from the other way.  What could be the issues.  I am pinging using the IP address only.  This is a Windows network and the client computer is Windows 10.  I am almost 100% positive that the client is the problem.
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Python 3 Fundamentals
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Python 3 Fundamentals

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Running dcdiag /v gives me the following warning

A warning event occurred.  EventID: 0x00001796
            Time Generated: 09/17/2018   18:28:17
            Event String:
            Microsoft Windows Server has detected that NTLM authentication is presently being used between clients and this server. This event occurs once per boot of the server on the first time a client uses NTLM with this server.

            NTLM is a weaker authentication mechanism. Please check:

                  Which applications are using NTLM authentication?
                  Are there configuration issues preventing the use of stronger authentication such as Kerberos authentication?
                  If NTLM must be supported, is Extended Protection configured?

            Details on how to complete these checks can be found at http://go.microsoft.com/fwlink/?LinkId=225699.

https://groups.google.com/forum/#!topic/microsoft.public.windows.server.active_directory/ISLY7NnqV-Y
Thanks for posting here!
There is a policy for this stuff.
Computer Configuration
-Windows Settings
--Security Settings
---Local Policies
----Security Options
Network security:LAN Manager authentication level
You may choose to "Send NTLMv2 response only\refuse LM & NTLM"

If you want to apply this to a domain, configure it at the default domain
controller policy.
Or you may configure it to your whole domain as well.
The Kerberos is the default mode and cannot be disabled and thus no need to
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Dear Experts,

Is there any article or can anyone explain to me as simple as possible on how NAT works in a firewall / router?

I know NAT is to access a different IP subnet from the source, but I just can’t seem to understand on the way it works and how it is to be configured.
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Our Windows 7 workstations are not authentication wirelessly. When we ask users to hardwire in they connect fine.
Windows 8 and Windows 10 are fine.

My teammate confirm certificate is not expired and from what we were told by another group no changes were made to Group Policies for WIndows 7 OU

Please see logs I am seeing on Windows 7 PC
Skipping: Eap method DLL path validation failed. Error: typeId=25, authorId=9, vendorId=0, vendorType=0
Skipping: Eap method DLL path validation failed. Error: typeId=17, authorId=9, vendorId=0, vendorType=0
Skipping: Eap method DLL path validation failed. Error: typeId=43, authorId=9, vendorId=0, vendorType=0

On the Raduis Server

Client Machine:
      Security ID:                  NULL SID
      Account Name:                  -
      Fully Qualified Account Name:      -
      OS-Version:                  -
      Called Station Identifier:            8A-15-14-8C-60-B0: test_wireless
      Calling Station Identifier:            18-5E-0F-A6-5C-A2

NAS:
      NAS IPv4 Address:            10.2.10.15
      NAS IPv6 Address:            -
      NAS Identifier:                  -
      NAS Port-Type:                  Wireless - IEEE 802.11
      NAS Port:                  5

RADIUS Client:
      Client Friendly Name:            ap--mgmt.example.com
      Client IP Address:                  10.2.10.15

Authentication Details:
      Connection Request Policy Name:      Use Windows authentication for all users
      Network Policy Name:            wireless
      Authentication Provider:            Windows
      Authentication Server:            SVexample.test.com
      Authentication Type:            PEAP
      EAP Type:                  -
      Account Session Identifier:            34323537373032463445343838424242
      Logging Results:      …
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I reveived some OVAs and an instruction book to set up an ESXi Server for testing.
Reading the instruction guide, it appears they are setting up one vSwitch with two physical nics (one as a failover).  


ESXi-1 mgt is set to VLAN 50.  
The virtual machines currently only have (1) Network Interface
The networking setup for ESXi-1 shows a single virtual switch (vswitch0) configured to use (2) physical ethernet interfaces
in an Active (vmnic0) and Standby (vmnic1) configuration.

The ESXi-1 host is configured as ESXi port 1 as vmnic0 and ESXi port 2 as vmnic1


It shows
ESXi-1 port 1  Trunk  VLANs=20,30,50
ESXi-1 port 2  Trunk  VLANs=20,30,50

VLAN 20 = 192.168.50.32/27
VLAN 30 = 192.168.50.128/27
VLAN 50 = 192.168.50.48/28

Then, they have two port groups off of vSwitch0 set with VLANs (101,102).

VLAN 101 (Port Group INF) = 10.10.10.62/26
VLAN 102 (Port Group FMT) = 10.10.10.126/26

The DC is on INF (DC 10.10.10.1)
Two VMs on FMT (VM-FM1 10.10.10.10, VM-FM2 10.10.10.11)

There are two VMs on DE_FXT  based on the OVA deployment instructions.
(VM-DE1 192.168.50.22, VM-DE2 192.168.50.88).  

Will this setup require an L3 switch?

Does the diagram correspond to what is to be set up?
  ESXi Server set to VLAN 50
  Trunked Ports for VLANs on the switch
   Port Groups with VLANs
   Etc..

Will this setup require an L3 switch?

Also
Is it possible to set his up using pfsense and not connect to a physical switch?
Something like a …
0
I work for a company called CompanyA and we had a Ubiquiti EdgeRouter and I'm replacing it with a Draytek 2960, the internet is provided via a Leased Line with 20 static public IP Addresses.  There is a company in the same building as us called CompanyB and they share our leased line, previously the leased line went direct into the EdgeRouter and companyB's router plugged into one of the LAN ports on the EdgeRouter and this worked fine, I cant seem to replicate the setup on the Draytek to get internet traffic to CompanyB's router.  CompanyB have a Fortinet router which Im not familiar with.  I have a cable running from LAN2 on the Draytek into WAN1 on the Fortinet router, the Fortinet router on the WAN1 interface has a static address set of 50.50.50.50/255.255.255.248 which hasnt been changed since it worked with the EdgeRouter  The guy who originally setup the connection gave me the following notes
Gateway IP for CompanyB: 50.50.50.49
Usable IP Range: 50.50.50.50-50.50.50.54

All of the 20 IP Addresses including the above IP's have been added to the router WAN setup as aliases.

As you can tell im using fake IP addresses but you get the idea.

Please Help!!
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Hello Experts - I have a question about making an MX record change.  We are using Barracuda's email filtering service and they are asking that our MX records be pointed to the following addresses:

Primary: d35456a.ess.barracudanetworks.com
Backup: d35456b.ess.barracudanetworks.com

Currently both MX1 and MX2 point to individual Barracuda IP addresses.  The records are hosted with Network Solutions.  When I sign in, I navigate to the Advanced DNS section to edit but the form requires a numerical IP address and won't allow me to enter the addresses above.  I feel like I'm missing something here, any ideas?
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.