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Network Analysis

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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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Hi All,

We currently have Business Voice Edge VIOP from Comcast which is their proprietary voice platform. They have provisioned and require a 50Mb circuit over their fiber backbone to our office to services SLA for their voice platform. Thus far, as far as reliability, I have to say that we have had no real issues with call quality over the past year of usage.

Management has decided to move offices earlier than expected, and we overlooked Comcasts terms and conditions regarding portability of service to locations that do not currently have a Comcast fiber backbone in their building – which the location we are moving to does not have Comcast fiber. They are also not willing to work with us to temporarily provision over another circuit. At this point, we have three options – ranked in order of preference, and I wanted to know if anyone has experience and any recommendations to help in making the right decision. Here are the scenarios:

1.)      Upgrade with Comcast to the new location and wait 6 months for them to build out their own fiber (includes city permits) to the new office.
a.      One of two options in this cast to get service to our new office:
i.      Implement RingCentral month-to-month as a temporary VOIP platform while we wait. Forwarding temporary numbers to main numbers.
ii.      Implement a Ethernet Dedicated E-Line (point to point) between our office via layer 2 routing.
2.)      Terminate with Comcast and incur termination charges – something that we don’t want to do.…
0
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For some reason no one in the company can visit https://www.amctheatres.com/ we get the following error message.
"
The requested URL was rejected. Please consult with your administrator.

Your support ID is: 15532489170173462385

[Go Back]

It works fine outside of the network.
I have checked DNS for root kits and nothing came up. I changed the DNS on two computer to point to google (8.8.8.8) same result.

I did trace route and it looks normal.

Tracing route to 169.224.240.210 over a maximum of 30 hops

  1     2 ms     3 ms     2 ms  x
  2    <1 ms    <1 ms    <1 ms  x
  3     2 ms    16 ms     7 ms  r-uwmadison-isp-ge-7-0-1-2931.wiscnet.net [140.189.64.109]
  4     6 ms     6 ms     6 ms  r-222wwash-isp-ae2-3900.wiscnet.net [140.189.9.77]
  5    28 ms    22 ms    23 ms  madix-hurricane.net.wisc.edu [144.92.233.244]
  6    38 ms    19 ms    24 ms  10ge14-2.core1.chi1.he.net [184.105.222.57]
  7    24 ms    23 ms    23 ms  100ge14-1.core2.chi1.he.net [184.105.81.97]
  8    35 ms    29 ms    29 ms  100ge12-1.core1.mci3.he.net [184.105.81.209]
  9    30 ms    30 ms    34 ms  arsalon-technologies.gigabitethernet1-9.core1.mci3.he.net [184.105.250.62]
 10    31 ms    30 ms    30 ms  204-13-97-250.arsalon.net [204.13.97.250]
 11    40 ms    40 ms    40 ms  169.224.240.210

I did a packet capture and it looks normal.

so I am not sure what the issue is.

Any thoughts would be appreciated. Thanks!!!
0
I'm getting conflicting answers on this question:

What is the best NMAP command to use when you want to list all devices in the same network quickly after you successfully identified a server whose IP address is 10.10.0.5?

Nmap -T4 -F 10.10.0.0/24

Nmap -T4 -q 10.10.0.0/24

Nmap -T4 -O 10.10.0.0./24

Nmap -T4 -r 10.10.1.0./24




Some sites say to use the -F option others say -O

Sites saying to use -F:
Example Question/Answer: https://www.passleader.com/downloadable/download/sample/sample_id/5692/
(explination of answer) https://svn.nmap.org/nmap/zenmap/share/zenmap/config/scan_profile.usp

Another -F answer: http://www.certifychat.com/threads/2017-mar-new-312-50v9-pdf-and-312-50v9-vce-free-version-share.2439/



Can anyone give me a definitive answer and explain why?
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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
0
I want to record all unsuccessful login attempts in Kiwi Syslog, is it possible?
0
Has anyone used a free bandwidth monitor.  We can't afford the ones that are out there that cost.

Any help would be appreciated.
0
Hi, we are in work group environment, using cisco c3925 as the router facing Internet. How can we know the Internet pages where users access? Do you know any free tool or devices? Many thanks.
0
Hello ,

I have 2 questions about timestamp ;

1. I have try to convert time stamp value to normal time but it was returned anormal dates :) what is the format of this TS val ?
2. As far as i read on the http://www.networksorcery.com/enp/protocol/tcp/option008.htm 


This field is only valid if the ACK bit is set in the TCP header.


but nearly all SYN packets in normal traffic not a DDOS has TSval  while ack was not sScreen-Shot-2017-08-27-at-18.05.41.pnget
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Hello

I have a couple of WAN connections and used by few users to access company services like : Mail,Web Applications...etc.
Both Lines have "A" Records with our ISP. if one line is down,  is it possible to redirect the users to access services through the back up line ? or can you suggest best scenario ?

Best Regards
Mahmoud
0
My "server1" Windows 2012 R2 has two NICs, with two static IPs, 192.168.20.10 and 192.168.37.10

When ping  "server1" from a client on the 192.168.20.x it replies with the 192.168.37.10 IP and says it cannot find it

How can I get "server1" to reply as 192.168.20.10 instead ?
0
Prepare for your VMware VCP6-DCV exam.
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Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

I have encountered a security breach, the most likely explanation is packet sniffing of http data. The issue is that we have many companies each assigned to their own separate VLANs. Can packet sniffers sniff across different Vlans if they are connected to the same  the same switch or AP? I didn't think that was possible?
0
In the search tool - you can select source or destination address that EQUALS, NOT EQUALS, IS EITHER, IS NEITHER. But what I haven't figured out is how to search by subnet. e.g. show me all the traffic with Destination in the 10.12.67.0/24 subnet. Is that possible?
0
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.
0
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 …
0
Hello Experts, I need some assistance since I'm not that familiar with SonicWall

I have a TZ215 FW with both, LAN and WLAN active configurations, I upgraded my ISP BW from 10Mbps to 20Mbps (cable provider) and just realized that everything connected to the LAN interfaces on my sonicwall (X0) are getting the full 20Mbps (or really near with speedtest.net) but all my wireless clients only get up to 10Mbps...

Does anyone has any idea of what is going on here?

Thanks for your support
1
In this article, we’ll look at how to deploy ProxySQL.
0
I set up a Linksys LRT224 router about a year ago
it does some pass-throughs ti the following
-security camera NVR only two users can access

-Windows Server 2012 running an SQL database about 10 users

-VPN connection so users can get to all servers and appliances
This was suppose to be for only two users, but now they want all 10 users to be able to use VPN

Question?
should I continue to use this router? will is start to degrade in speed
some users say the VPN is starting to slow down

any suggestions are appreciated
0
I have an HP EliteBook 8730w HP machine with XP SP3.  The NIC is a 82567LM Gigabit.  Wireshark Version 1.6.1 is seeing a flood (packet ea/.001068 seconds +/-) of protocol 0x8899 Ethernet II packets (All outgoing; no responses).  Packet length ranges from 64 to about 1499 or 1518 packets long. The problem I have is that I cannot find the Source MAC on my (small home) network (I have tried several MAC scanners), nor do I know anything about the destination address.

Source:  f8:c0:01:7c:65:cc
Destination: Dell_79:08:f2 (00:19:b9:79:08:f2)
Type: Unknown (0x8899), Ethernet II
Data (1504 bytes)
5 lines of data:
0010   88 64 11 00 14 ef 05 d6 00 21 45 40 05 d4 ac 25  .d.......!E@...%
0020   20 00 36 11 54 58 47 13 fb f9 61 73 b9 db a0 e1   .6.TXG...as....
0030   c9 be 05 cd 4b 14 32 bb 81 3a 22 b9 5d 95 21 4e  ....K.2..:".].!N
0040   6d 27 cb 53 59 65 0b 8d 75 33 cb ab f9 de 7e 52  m'.SYe..u3....~R
0050   32 57 86 24 53 27 ee 64 20 41 72 31 20 11 2a 43  2W.$S'.d Ar1 .*C
.
.

So, I have no such source or destination MAC on my network (that I can tell) , am seeing  an ongoing flood  of data anytime day/night.  To my knowledge, I have no Dell equipment on my network (two printers, 4-5 computers, a couple of Smart phones, and several Security DVRs).  Most computers behind one or more switches.  I am certain that I have no Realtek routers/switches or anything that might be using a managed protocol i.e. Realtek Remote Control Protocol (RRCP) Type 0x8899.
0
We are having some "unspecified network issues" between a Windows Vista and Windows 10 computer.  

As we are trying to eliminate causes one by one.  The ping times between these two wired computers will go from less than 1ms up to 15ms with 90%+ of the them being single digits or below 1ms.  

Is this normal?
0
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How can I test the speed between two computers on the network?
0
Can someone please recommend a good SNMP monitoring software - preferably free
0
Looking for a application I caN check out my network to see if there is a issue in loss of connects delays slow connection and if, which point and what application. Any recommendations but not something that should break my pocket.
0
Hello,

We are pinging a network device from a Lunix computer and see there is an indication of packet drops - see screenshot.  

I disconnect the network cable of the ping target device and I do not any ping response to that IP.  

What can I do to troubleshoot?

Thanks.
packetlost.png
0
We currently have a Dell Sonic Firewall that is our firewall as well as our company router.  This is our main router for all of our sites in the company.  We have 16.  We implemented through our EMR (Electronic Medical Records) software an upload to a billing company.  They in turn configure and print bills and send them out to our customers.  This has worked fine for over two years.  When this was implemented, we were not required to make any firewall changes at all.

A week ago, the user doing this procedure received an error that the file could not be uploaded.  She called the EMR company, who in their effort to troubleshoot the problem, changed the upload method from ftp to sftp.  She then tried to upload and she got an additional error that port 22 was unable to send.  Seeing that error, the EMR said that the problem has to do with our firewall.  I spoke with the billing company who tried to do a trace route to our external IP.  They were unsuccessful, but I was able to do a trace route to them.  The only caveat is that the user can do this procedure from home with no problem.

I am willing to make firewall changes if necessary, I just don't know what they would be or why it is necessary now, if no one has made any changes other than the upload method from ftp to sftp.

Please help.  I am desperate.
0
what is the difference between nagios and centreon, are they technically both the same
0

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).