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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OSPF Visibility of the Network.

Unlike RIP and EIGRP, OSPF is a Link State protocol, what does that mean ? does it mean a router configured with OSPF knows the topology in every router that is configured with OSPF ?at least the routers that are in t same area ?

Reading about SDN , this technology has a capability to have visibility of the whole network topology.  is it the same as OSPF routers in the same area ?

Thank you
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OWASP Proactive Controls
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OWASP Proactive Controls

Learn the most important control and control categories that every architect and developer should include in their projects.

Physical Parts of Control/Data/Management Plane.

reading about Control/Data/Management Planes , if I understand :

Control plane is where the Routing table is built.
Data Plane or also called Forwarding plane contains a copy of RIB
Management Plane , I am not sure what it is, probably it is just the interface of the router or the switch to which we connect to.

What I need to know, is the hardware that the above elements run on.

for instance does Control  plane encompasses CPU , Memory , or it is completely different Chip ? the same question applies for Data plane and Management Plane, on which hardware do they run on?

Thank you
0
I have a client's windows 7 pro computer that suddenly stopped getting past the welcome screen. This occurred after the attempted (automatic) installation of a set of windows updates from the 11/14/19. The initial problem was that it just kept looping on windows repair with none of the options able to fix the problem. Since none of the repair steps did anything so I decided to run the restore from image (via Macrium). The drives restored but the computer now hangs at the welcome screen.

I have done the standard boot fixes: Setting the partition active, running rootrec /fixmbr and bootrec /fixboot. This didn't take care of the problem either. When I did bcdboot c:\windows I got a message about failure to copy the boot files.

After that, I tried the aomei partition assistant and used fixmbr but that had some effect and changed the symptoms. Now it gets to the windows 7 options where you can choose safe mode / safe mode with networking / etc. If I try just a safe mode startup, it will run down the program list but freeze at disk.sys and go no further.

My hunch is that the machine was uefi and for some reason, the uefi partition didn't get restored correctly or is missing something. I have used two different images attempting the restore without any change.

Any one have any ideas on how to get this box back up and running?

Thanks in advance for the assist on this one.

Regards,

Bill
0
Hello EE,

Please see attach some information about my computer for a quick idea.
What I am experiencing since a while is a "randomly" lost of my wireless adapter, sometimes my wireless keyboard stops working (battery is brand new..I have to unplug the little usb plug, replug and it starts to work again.

The wireless Adapter stops like I said, but in Network setting it's written something like : "you are not connected to internet but you can still see local network"
if I trouble shoot it says somehing like:  "windows can't communicate with the device or resource (primary dns server)"

My drivers seems to be updated.... (or thats why im thinking..!? maybe not?)

My question is : I suspect my USB ports to have a problem..is it possible there is a "lack of power" ? is it possible the computer kind of randomwly disable a port for x reason and re-enable ?

This is the feeling i have when im on the computer.

Any ideas before I throw the box out of the kitchen window?
cpu.png
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Have two Dell powerconnect 5548's set up in a stack. Recently have been unable to login and when attempting ssh, I get the following error.
Remote side sent disconnect message - type 2 (protocol error): "Connection closed by server: Server reached maximum number of simultaneous connections

Open in new window

There seems to be a command for other dell switches to clear sessions however I am not seeing anything for the 5500x series. I set a session timeout and even rebooted the switch but I am still getting this error. All line connections show as locked in the web UI however reactivating the locked line through the GUI does not do anything. Anybody more familiar with Dell switches have an idea for how to resolve this error? I can currently manage the switch by console and web ui however it would be great to get remote ssh sessions running again.
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Hi

We have Alcatel Lucent Omni PCX office  when extension 221 is dialled  and if no one picks up, the call gets forwarded to another extension 283

I have admin access to the  portal  and not sure where the setting needs changed  and any help would be great.

Thanks
1
We have a DNS server [BIND] in our environment, This was built for setting name resolution for our internal network.

All the VM's in our environment use this for name lookups.

We had added public forwarders in bind configuration, so if there is some name outside our environment they will be transferred to them for lookups.

Now there is a case where, I need to have our DNS server forward requests to other DNS based on domain name.

Example:

domain.local is the intial configuration
if the request comes to DNS for
internaldomain1.com it should query 192.188.10.10
if the request comes to DNS for internaldomain2.com then it should query 192.188.10.12


Please let me know how can we accomplish this
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Dear Experts

I am looking for the best practice network design to connect 03 offices which is 3 different locations with secured links with redundant links. Below explained
Data center where business applications are hosted in the location 1 here the business applications which are web-based applications, windows AD for authentication, file server, email server are maintained, cisco 1010 FTD and Cisco FMC is in place and two ISP’s.
Location 2 which is far of distance is going to be connected to location 1 data center with MPLS VPN link and for redundancy broad band link planning for SD WAN solution. Finalized and implementation is in progress.
Now that all the employees who were so far working in location 1 that is at data center location to be shifted to the location 3 which is of little distance from location 1.  However, we are not shifting data center and our employess are of 20 users who is going to work from location 3 and they have to login for authentication to location 1 where the windows AD and file server for their document store and business application they use CRM.
1.      Please suggest the best network design to connect location 3 to location 1, should I have to plan for MPLS VPN as one link and secondary link as leased line and use SD WAN solution here or any other best practice please.
2.      How much bandwidth would be needed between location 3 to location 1 for web-based and store documents in the folder
3.  as we have 20 users is it required to setup …
0
VOIP calls suffering from silent patches.

We had BT Cloud Voice put in around 6 months back and have suffered with issues since it was put in. We put this down to our FTTC lines, however we have now had a Virgin Leased Line installed (100mb/1gb).

We currently have around 90 computers and 90 phones. These are run through Netgear GS752TPv2 switches and to a Draytek 2926 router.

Looking on the router, the syslog is showing quite a lot of errors similar to the one below:

 [VoIP_QoS] VoIP RTP[45348] Rx Loss detected: 16/115 ...

There is also a few errors as below:
 [VoIP_QoS] VoIP RTP[45344] latency detected...220.

I'm assuming the first error is the receive packet loss (of around 15% in the case above) which could be causing the silent patches.

As well as this, I've setup a ping to the router from two different computers that are in different switches. They are both getting timeouts at the same time, one or twice a minute (sometimes there is a longer gap, sometimes there will be 2 within 10 seconds).

Any ideas where to start looking to try and resolve this issue?

Thanks, Shane
0
Hello,

I am trying to announce a test prefix via BGP to test a new expressroute circuit we have setup.  I have a cisco 3850 layer switch and I would like to know the commands needed to setup this test prefix so I can do it without disrupting our current traffic. Tks in advance.

peer_asn                      = 650XX
primary_peer_address_prefix   = "172.16.0.0/30"
secondary_peer_address_prefix = "172.16.0.4/30"
vlan_id                       = 150
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Need to set up a ring topology using ubiquiti switches. The area to be covered requires about 400ft between each switch. How do i configur the switched to do this ?
0
He attached article outlines an issue I’ve encountered with numerous MS Access databases that I own.  The databases are all split and shared by multiple simultaneous users.  Both the frontend and backend for each database is stored on a network drive.

The article provides workarounds for single-file databases and databases that are split, but in the scenario they lay out for split databases, each user has their own copy of the frontend.  

In a situation like mine where the frontend is stored on a network drive and shared, would leasing need to be disabled for the folder that houses the shared frontend as well?  Thank you.  

https://support.office.com/en-us/article/access-reports-that-databases-are-in-an-inconsistent-state-%EF%BB%BF-7ec975da-f7a9-4414-a306-d3a7c422dc1d
0
Hi all,

We are using Windows Server 2019 fileservers with DFS. Our users are using Windows 10 (Build 1803).

The users are accessing the files by a Network share pointing to the DFS Namespace.

Some of our users report that they are temporarily unable to access the files via DFS. The affected users receive the error message "An unexpected network error occurred".
The problem is always sporadic and always affects other users, but always only a few. Normally, the problem only persists for a few minutes.

There are no warnings or errors in the eventlogs of the fileservers. A reboot from the Servers did not solve the Problem.

Does anyone have any idea what the problem here might be?

Thanks,

Guido
0
I've recently build two new Windows 2016 DC's (DC01 & DC02) in order to replace my old Windows 2008 DC's (DC1 & DC2).

However, now when I try and open the Group Policy Management in either of the 4 DC's, I'm getting an error The Network name cannot be found.

I'm stuck.  Can anyone help me with this?
0
I am having a problem downloading a trial version of VSAT.  My overall objective is to complete a comprehensive analysis (datastores, networking, host, VM Tools, Updates and VM performance within a VMware 6x infrastructure.  I don't believe VSAT will give me all the answers I am looking for.  Is there a comprehensive set of tool(s) that can assist in reaching my objective.

Lipotech
0
I have a mass Kyocera scanner copier on our network that has a scanner.   I am mapping a folder on everyone's Windows 10 computer to the printer so that people can scan to folder directly on their computers from the copier.  The configuration is mainly the same on all computers.  I have successfully executed the scan to folder setup from the scanner to the computer for some of the users.  On other computers, there seems to be something blocking the process.  I'm at a loss at this point as to what could be preventing the scanner from accessing the folders on some of these computers.  Is there a way to troubleshoot this issue and see what the problem is?  I know it has to be something on the computer I think.
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Hello.  I am managing a small network with 2 DC controllers.  A few months ago a ransomware hit our network and encrypted all files in Sysvol.  We managed to recreate Group Policies.  Now I have a message from the Server Manager Dashboard belong to 2 nodes and 1 vm server saying that "Online - Data retrieval failure occurred".  How can I fix this problem?
0
We cannot access our website from inside the LAN but outside. The windows domain that was setup is ptad.gov.ng and the website is https://www.ptad.gov.ng. Looks like the domain are clashing what do you thing could be responsible.
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I am working on making some changes on AVAYA VSP4850 switches.  This is my first time working on Avaya and I have some questions on how things work.

On the switches are multiple vlans.
vlan create  10 name "Data" type port-mstprstp 1
   vlan members 10 1/1-1/40 portmember
   vlan i-sid 101 7770010

vlan create  20 name "voice" type port-mstprstp 1
   vlan members 20 1/3-1/40 portmember
   vlan i-sid 101 7770020

vlan create 30 name "private" type port-mstprstp 1
   vlan members 30 1/41-1/46 portmember
   vlan i-sid 200 7770030

vlan create 100 name "Internet out" type port-mstprstp 1
    vlan i-sid 100 770100

vlan create 500 name "Cisco_ASA" type port-mstprstp 2
   vlan members 500 1/48 portmember
   interface Vlan 500
   ip address 192.168.10.253 255.255.255.252 2
exit

vlan create 4051 name "BVID-1" type spbm-bvlan
vlan create 4052 name "BVID-2" type spbm-bvlan

#
# ISIS SPBM CONFIGURATION
#

router isis
spbm 1
spbm 1 nick-name 10.00.10
spbm 1 b-vid 4051-4052 primary 4051
spbm 1 ip enable
exit




interface GigabitEthernet 1/48
no shutdown
isis
exit
interface GigabitEthernet 1/49
default-vlan-id 0
no shutdown
isis
isis spbm 1
isis enable
no spanning-tree mstp  force-port-state enable
no spanning-tree mstp msti 62 force-port-state enable
exit
interface GigabitEthernet 1/50
default-vlan-id 0
no shutdown
isis
isis spbm 1
isis enable
no spanning-tree mstp  
0
Amazon Web Services
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Amazon Web Services

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.

One of our thin clients is having big issues and despite being able to connect to the local server farm and  a usable IP, it says it's refusing VNC connections and the VNC server is not running.

I've tried everything to enable it, and the ports seem to be running, but I can't connect.

I'd like to avoid them sending it up to us, but I'm not sure there's any way to connect into the Thin Client configuration as HPDM 4.7 isn't able to.
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We utilize Open-Mesh networking (they sold to Datto) I am waiting on a higher teir support, but thought I would reach out here as well.

We are having a spastic network issue where devices (random ones and random models) are all getting disconnected from the internet but stay connected to lan.

They return an IP starting with 169 which references that it cannot connect to our dhcp server

An IPconfig /release /renew sometimes resolves, and other times it does not.

Thoughts or ideas? I am waiting on Cloudtrax/Datto to get the AP logs
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I have  cisco switch, a 3850 and created a port channel for 3 ports.  Each port is a 10G port.  On the other side, I'm using a synology with 4 (1G) ports. I did a LACP on that side as well and bonded 3 of the ports.  It shows the link at 3000 Mbps.

On the cisco switch, the port channel shows a speed of a-1000

Not sure why it's only connecting at 1000, but when I did a speed ?, it only gives me the options of 10, 100,1000, auto and nonegotiate.  I tried auto and it puts it back to a-1000.  I tried nonegotiate and it didn't take that command.  So how do I get the port channel to run at 10G, so it can at least transfer at 3G?
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Hi all - I keep losing internet connection for 10-20 seconds, then it restores itself.   This happens about once or twice per hour.  By the time I start to test it, it's all fixed, so difficult to troubleshoot. Can anyone suggest how I might track down the culprit here?  Even just some SW that will tell me if I lost connection over the last 24 hours would help me troubleshoot things.  (Have already powered down cable modem, router, & restarted, reset modem, etc)

I have a basic setup, we use WiFi only, not sure if hard-wired Ethernet also goes out or if it is just a WiFi problem

SPECTRUM            ->    MOTOROLA/ARRIS       ->     AIRPORT EXTREME     --WiFi->   Various Macs, PC's
(TIME WARNER)           SB6141                                   ROUTER from                               Printers, & Smart Phones
CABLE SERVICE            CABLE MODEM                      APPLE
0
Please guide me to create a MS Dos script that would send an email via outlook to more than one recipient when a file is updated at certain location on the network.

Thank you,
0
I have a cloud server with a public IP address of 1.1.1.1 (not the real IP). There are over 100 users on standalone PC's over 12 sites across the south of the country who have a mapped drive on their devices using the UNC path \\1.1.1.1\data. The cloud provider can't upgrade the OS on the server (it's currently server 2008) and therefore a new one needs to be provisioned. I'm migrating the AD data over and replicating the domain name etc. I somehow need to map all users to the new UNC path \\2.2.2.2\data with ease. I can't use the hostfile mapping as DNS is not involved.

The question therefore is as follows: Is there an easy way using the command line or PowerShell to route the old IP address 1.1.1.1 to the new IP address 2.2.2.2 so I don't have to re-map over 100 devices or do I suck it up and remap from scratch?
1

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.