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Network Analysis

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Solutions

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Contributors

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

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Describe two different interpretations of the term MIB.
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What lower-layer protocol encapsulates SNMP messages?
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Because SNMP uses two different port numbers (UDP ports 161 and 162), a single system can easily run both a manager and an agent.  What would happen if the same port number were used for both?
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hello,

I have a windows 7 system with a thick proprietary application layer on top of it, and am trying to attach to a network share with failure at permissions.  

It's a simple network share to a folder with a login and password.  

On my laptop, I can put the same information in and it works fine.  But something on this other system is gumming it up.  I'm not sure if it is a firewall or some kind of whitelisting or what.   The path and login seem correct, and it does have rights, but for some reason the client does not think it has rights.  

I have looked at the cap file, attached, but cannot make sense of the failure here.   139.52.72.58 is the client.  129.106.10.236 is the server with the folder.  

Can anyone make sense of this?  Thank you.  I hope I am requesting this correctly.
pcapCapturecap20171117121609037.cap
writepermissions-1.pdf
IMG_5961.JPG
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Customer has a LAN with a few PCs and some tabs/phones that connect to Internet via their LAN (partly wireless). Internet access is through a 4G mobile modem (other options not available). This has worked well for nearly a year.

Lately they have experienced a lot more data traffic. Since they pay per GB to the mobile operator they try to find what is causing the increased data usage. I have checked the wireless LAN, but can't see anything wrong. Also changed the encryption key.

Question is - is there a way to easily monitor the traffic from the LAN to the 4G network. A packet sniffer might do the job, but results are quite difficult to analyze. Is there an easier way? Thinking of monitoring each LAN IP and traffic to/from the 4G router.
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Hi,

is it possible to get the source code of free tools?  Port Scanner for exemple
Regards
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Dear All

I installed Fortigate 60 E and its blocking all the videos and Audios. Also its blocking all the social media sites.
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Can anyone here help me troubleshoot a local 1-subnet network which is having latency between devices when I ping the SQL server some time I have undeliverable packets, this network has 100 devices and the switch is almost brand new, however, everything is moving super slow, how can detect the cause of the slowness? Thank you.
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Okay... Here's the situation. I have sort of inherited a system. I have a 'working' location and a new location we are creating. Horizon View 7. We use dedicated pools with static machines assigned to users. There is a mix of both Win7 and Linux (CentOS and Ubuntu and something else I can't remember). All the VM's have to autologin to a desktop with a local user. This is a requirement that can't be changed. According to users in the other location, they are able to connect to their running VM's with no issues and it connects to the running session. In testing the new environment, this doesn't work. We get the resource busy or unavailable error. On my Win7 VM that I am testing with, I have installed the console plugin. This allows me to connect directly to the VM with a user already logged in, but I'm prompted for the local user account. Connecting to the Horizon server, does not work. The VM's we started working with at the beginning of this were VM's from the other location. Now we are building from scratch.

We've had our networking guys investigate it was well and according to them, this is all connected at the switch level and nothing is being blocked. I would not rule out networking though.

Any ideas what the issue is or if what we need to do is even possible? I've been told to make this work even though it does seem like it would be easier to just allow console access.
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I've installed GFI languard client on about 20 computers successfully, now it just says "pending install" on all new clients and doesn't do anything. What might be stopping it? What kind of reporting/analysis is there to trouble shoot this?
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Veeam is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

Hello, we have a staff of 20, and we want to track websites and bandwidth used by workstation/user. What's the best tool to do this?
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My son's computer keeps having internet connection issues.

-Is playing on a minecract server / minecraft client

Sometimes these apps are also open
-Twitch
-Discord

He is playing on a minecraft server.  and begins to experience lag more and more frequently before the crash.
Is there any way to track down the culprit?  We could assume that it is not enough RAM and go buy more RAM and the problem happens again and we are no better off.

I am looking for a way to gather information that can help tells us what thing( s ) is causing the problem(  s  )

sys info 2systxt.txt
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guys, here is the question. I have one function that optimize images using jimp package and I want to run this function on the command line of one server on digitalocean but i dont want to install lots of things on it. so I install npm and node, but I am very new to node and npm, so I dont know how to execute this javascript that will read the files and optimize images. I want to be able to do something like this on terminal:   execute optimize.js /var/www/html


here is the function I did:

function optimize(path){
    let Jimp     = require("jimp");
    let fs = Npm.require( 'fs' ),
    try { var files = fs.readdirSync(path); }
    catch(e) { console.log(e); }
    if (files.length > 0){
      for (var i = 0; i < files.length; i++) {
          //console.log(files[i]);
          var originalPath = path + '/original/' + files[i];
          var currentPath  = path + '/' + files[i];
          //copy img code here
          console.log('Processing 1. Copying bkp to folder: '+originalPath);
          fs.copyFileSync(currentPath, originalPath);
          //remove current file code here
          console.log('Processing 2. Removing current file from folder: '+currentPath);
          fs.unlinkSync(currentPath);
          //optimize image.
          Jimp.read(originalPath, function (err, lenna) {
                  console.log('Processing 3. Starting Optimizing from: '+originalPath);
                  console.log('Processing 4. Starting Optimizing to:   …
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I have 7 Intellinet 24 POE Switches, installed in the past 3 months.  2 have never reset.  They are in a building on a separate subnet.
I also have two smaller 8 port Netgear POE switches, they have never reset.

There are 5 units that have at least once reset.  Details below

There are two VLANs, 1 (default) and 2 (VOIP), when everything is working it all works very well, data and VOIP traffic is good

Since their installation I have had three incidents where 1, 2, or 4 of the 9 switches were suddenly and with out explanation reset to Factory Defaults.  (I can duplicate this condition be pressing the reset button as you know)

Incident 1 - several weeks after initial installation and roll out of phones, I came in to find that 4 of the 9 switches were factory reset.

I blamed this on my having not changed the default password on the device.  I restored programming, changed the passwords and also put the switches on a private subnet.

Incident 2 - Several weeks later, two of the switches were found in Factory Reset.   Both switches are in areas of our buildings that are accessible to staff (not locked up), I spoke with management and got permission to put a camera in one of the utility closets.  I have not put the camera in, but the belief shared by everyone is that I have.

Incident 3 - 2 weeks later 1 switch (one of the two in Incident 2 , but not the one with the phantom camera.
I reprogrammed the switch, and restored VOIP service.

Some other facts: Two …
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Hey all, we are trying to track down websites visited by PC and how much bandwidth they are using. What software can do this for us?
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I have hsrp for gateway redundancy for my fw1. wan1 and wan2 router have hsrp configured with the virtual hsrp 1.1.1.1. Currently. as you can see from the diagram, if sw1 fails, I have to manually move the cables to sw2. How would I make sw2 the backup for sw1? Thx

pic
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hi folks

i am wondering if anyone ever used Cisco WRVS4400N's port mirroring feature to monitor traffic of a given port?

i have tried any individual port or even all ports together as the source, but i still cannot see any mirrored traffic from listening to the specific port (Port 4), as shown below.

Screen-Shot-2017-09-13-at-13.29.04.png
i have no idea why the device doesn't work as expected. do you have any suggestion please?

regards,
bbao
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I have a single workstation on the domain that everyday brings the network to a halt by utilizing the entire bandwidth for the office.  The report from solarwinds shows:  Se0/0/0       216.58.193.174  Gi0/1         -internal ip-     06 01BB C453  7771K.  Any ideas on how to troubleshoot this issue?  I did not find any malware on the workstation, and during most of the traffic burst time the user is not at the keyboard.
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How set equally load balancing for 3 different ISPs

Please find the exsting config, after this configuration i am unable to get load balancing in order, always traffice goes automaticly from interface FastEthernet0/0/0 every time i dont know why its happing.

Maximum time uses:-
interface FastEthernet0/1 - 20% (4Mbps Link)
interface FastEthernet0/0/0 - 30% (2Mbps LInk)
interface FastEthernet0/0/1  - 50% (2Mbps LInk)

why every time traffice use primery interface as a interface FastEthernet0/0/1, please suggest what need to be changes for traffice move in order, example:-
interface FastEthernet0/1 - 60% (4Mbps Link)
interface FastEthernet0/0/0 - 20% (2Mbps LInk)
interface FastEthernet0/0/1  - 20% (2Mbps LInk)

Router 1 Config:-

interface FastEthernet0/0
 description office_64/5/10_Lan
 ip address 192.168.90.1 255.255.255.0
 ip flow ingress
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description 4Mbps
 ip address 1.1.1.1 255.255.255.0
 delay 1
 duplex auto
 speed auto
!
interface FastEthernet0/0/0
 description 2Mbps
 ip address 2.2.2.1 255.255.255.0
 delay 2
 duplex auto
 speed auto
!
interface FastEthernet0/0/1
 description 2Mbps
 ip address 3.3.3.1 255.255.255.0
 delay 3
 duplex auto
 speed auto
!
!
router eigrp 100
 variance 2
 network 1.1.1.0 0.0.0.3
 network 2.2.2.0 0.0.0.3
 network 3.3.3.0 0.0.0.3
 network 192.168.90.0

Router 2 Config:-

interface FastEthernet0/0
 description Rack_Lan
 ip address …
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Greetings,
I've fumbled around doing research on this issue, but am no closer to figuring it out.  In short, I am trying to access www.bcid.org from inside their office network and cannot. They are on a domain by the name of bcid.org and connected to a single Windows 2008 R2 server (that I did not set up).  The site can be accessed from outside the network and is hosted externally.

When I browse to the website in a browser, I get the error:
Forbidden
You don't have permission to access / on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

When I ping www.bcid.org, I get the IP address (64.224.215.186) but the requests time out.  As a test, I've tried changing a workstation's DNS to 8.8.8.8 / 8.8.4.4 but still get the same issue.  I also flushed the DNS with no change.  I tried changing  the local hosts file on this workstation but also didn't see a change after adding a line for 64.224.215.186 www.bcid.org.  I just did an NSlookup from this workstation and got the server as the Google DNS server  and the Non-authoritative answer as:
www.bcid.org.bcid.org
64.224.215.186

I'm at a loss as to where to go from here or what the issue even is.  Thanks!
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Let me start off by saying I'm in no way shape or form a network engineer. I am an IT Generalist and I'm in the process of trying to figure out why some remote IP phones have stopped working for a client. I don't want to get too into the weeds, but I've looked at and compared traffic from working equipment to this non working system. What I've seemed to have boiled it down to is:

Working: Phone tries to communicate on Port 6801 with server, server sends RST, ACK - phone then tries Port 6802 - same. Finally phone tries port 6800 and everything works fine.

Non-working: Phone tries to communicate on Port 6801, receives back a RST (without ACK). Phone continually tries to communicate on port 6801 until it reboots and starts over.

I've captured traffic at the server, at the firewall and at the phone. It seems like the packets are leaving the server as RST, ACK, leaving the Firewall as RST, ACK but arriving at the remote location as RST.

I'm looking for ideas on what could cause this?
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I have a NETGEAR ProSAFE GS748T 48-Port switch (BRAND NEW). I also have a 5 port netgear switch for two workstations. All cabling is Cat 5e. Some workstations are not running at full Gigabit. Some are 100MBPS and I even have one running at 10MBPS. I have updated all NIC drivers, they are all set to auto negotiate, and they are all gigabit nics.
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hi team
I have couple of question on packet loss
1.  what all steps we need to take for packet loss
2. what are avialbale tools for checking packet loss
3. what are possibilities  of packet loss
4. what are the parameters to check packet loss
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On RH 6 systems running rsyslog 5.8.10 we noticed that if we setup a
client system to use TCP to log to a remote server:
*.*       @@192.168.1.2

Open in new window

If the remote log server is not reachable for some reason no logging takes place, not even local logging to the local system log files.
When the log server is available and rsyslog is restarted  both local logging and remote logging work.   I would like to come up with a config that would ensure that local logging still occurs when  the TCP remote server is down?  I think I need to look at action queues, but was hoping someone could provide an example on how to get this to work.
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Over the past few weeks my laptop has appeared to be non-responsive. Running speedtests shows the download speed is fine, but the upload will start strong, then the test just seems to hang. I've tried multiple browsers, uninstalled the antivirus, turned off the firewall and Bitdefender but nothing seems to help. Thinking it was the router, I ran a speedtest tethered to my phone, but similar results. Another laptop worked fine with the router as well.

I see no issues in event log, and I tried to update the wireless drivers but it was up to date. I'm not sure what my next step should be.

Thanks for any help.
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Network Analysis

9K

Solutions

12K

Contributors

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).