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Network Analysis

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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).

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I want to record all unsuccessful login attempts in Kiwi Syslog, is it possible?
0
Will your db performance match your db growth?
LVL 3
Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

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
0
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
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?
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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
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
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
What does it mean to be "Always On"?
LVL 4
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

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
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
I'm sure I have done something wrong here. This is such a basic config. Can you tell me why my router can communicate outside, but my PCs cannot?

!
! Last configuration change at 17:48:41 UTC Sat Jun 10 2017
!
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname MYROUTER
!
boot-start-marker
boot-end-marker
!
enable secret 5 <obscured>
enable password <obscured>
!
no aaa new-model
!
no process cpu extended history
no process cpu autoprofile hog
memory-size iomem 20
dot11 syslog
ip source-route
no ip routing
!
!
!
!
no ip cef
no ip domain lookup
!
multilink bundle-name authenticated
!
!
!
!
!
license udi pid CISCO1841 sn FTX1104Z0BG
!
redundancy
!
!
! 
!
!
!
!
!
!
interface FastEthernet0/0
 description OUTSIDE
 ip address dhcp
 ip nat outside
 no ip virtual-reassembly
 duplex auto
 speed auto
 no cdp enable
!
interface FastEthernet0/1
 description INSIDE
 ip address 172.16.254.1 255.255.255.0
 ip flow ingress
 ip nat inside
 ip virtual-reassembly
 no ip route-cache
 speed auto
 half-duplex
 no cdp enable
 no mop enabled
!
interface ATM0/0/0
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip nat inside source list 101 interface FastEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 dhcp
!
access-list 101 permit ip any any
no cdp run

!
!
!
snmp-server community public RO
!
!
control-plane
!
!
line con 0
 

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0
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Hi All Expert,

Good Day.

I have a client from my company which it having network laggy issue, the lag is from the warehouse office and the HQ office is not having issue. My boss blame the ISP for the lag, software at the warehouse office is very laggy and the software team blames the network on the warehouse. But when I do a speed test it's actually getting the correct speed, I use one of the user pc to ping my server(HQ) and it's getting high ping around 170-180, from my server pinging the user at warehouse also getting this ping result. I have restarted the server before also same, pinging the firewall is low ping. Appreciate if any expert can advise me on.

Many Thanks!
0
I'd like to test network bandwidth between 2 offices.   Can someone suggest a good tool I could use between the 2 computers?

Thanks,
0
Is there such a list of IP or smtp domains (doesn't have to be up to the hour up-to-date) list so
that we can block at our smtp?

Blocking by firewalls is not good as the emails will still come in
0
Hi guys

Those of you who have used network monitoring tools to get an idea of everything going on your network, what do you use? Have you got an idea of what Datadog is like?

Cheers
Yashy
0
I have 2 routers connected to the same MPLS provider. I have the statement maximum-paths 2 under my BGP config. I'd like to know what will happen if I remove it.

router BGP 65001
...
address-family nsap
 maximum-paths 2
exit-address family

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0
In a question placed previously regarding slow internet, an EE recommended the use of Acrylic Wi-Fi.  When we placed an image of the display of the apps (see pix below), the EE could recommended to change Channel to CH11, the Band Width to Only 20 MHz and disable WPS.

acrylic
Questions,

  • When running this apps from time to time, what should we look for to improve the connections? (Or be aware of possible "red flags" in our Wi-Fi)
  • We noticed that the "Max Speed" is 300 Mbps and now it went to 144.4 Mbps,
- what can it ba causing this decrease in Mbps?
(we also ran tha apps in another notebook and also 144.4 Mbps)

note, we run under Windows 10
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).