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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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I have the following config but however I cannot display any internet pages from a client machine and or ping from a client machine. All pings from the cisco router works and I get a reply however from the client it fails





 

ip access-list standard RFC1918-dns
 permit 10.23.72.0.255.255.255

 

ip dns name-list 1 permit .*
 

ip dns view default
 domain name-server 71.242.0.12
 domain name-server 71.242.0.13
 domain name SOMECOMPANY.LAN
 dns forwarding source-interface GigabitEthernet0/0


ip dns view-list LAN
 view default 1
  restrict source access-group RFC1918-dns
  restrict name-group 1
 

ip dns server view-group LAN
ip dns server


Pinging yahoo.com [98.138.252.38] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 98.138.252.38:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\ping foxnews.com

Pinging foxnews.com [104.92.16.8] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 104.92.16.8:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
0
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Hi there,
For some reason I cannot ping external IP addresses from my router cisco 2911.  Any device behind my router 2911 is perfectly fine and can ping, its only the router which cannot.  Need help in identifying where the fault is.  I forgot if I used to ping external address from my router or not as the devices behind it have no issue, some change at the ISP end might have occurred.  I have also contacted ISP according to them it is the internal issue.  
Here is the sample of ping from this router:
EXternal pings:
**********************************************
MyRouter_2911#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
*********************************************
Internal pings from this router:
********************************************
MyRouter_2911#ping 10.10.10.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.11, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
**************************************************
Show ver:
************************************************
System image file is "flash:/c2900-universalk9-mz.SPA.152-4.M9.bin"
Last reload type: Normal Reload
Last reload reason: Reload Command



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco…
0
I have an outside vendor that needs to communicate to their equipment on our inside network. I would like to set up a DMZ for that access. I have 5 public IP addresses to use. The ASA i want to set up is strictly for this use and no other. I have four devices on the inside that will have static IPs which will require certain ports to be opened. This is what they require. I do not have a config to post as of yet. I am trying to configure one.

Four static private IPs
External port forwarded to internals
  Port 90 Open - 1st internal IP
  Port 91 Open  - 2nd internal IP
  Port 2048 Open - 2nd internal IP
  Port 92 Open - 3rd internal IP
  Port forward 2049 to 2048
  Port 93 Open - 4th internal IP
  Port forward 2050 to 2048

Any suggestions would be greatly appreciated.
0
We have users that don't have static IPs and need them to gain access to some servers. They do have DDNS with nutpile so wondering if those dns names could be used instead of a source IP.
0
Dear Experts, we have this diagrams:

Internet ------ Router ------- Core Switch -------- Catalyst switch 500 ------- users

We suffered the slow Internet problem from yesterday, and from the Catalyst log, we saw these things:

1.JPG
On the Core switch at that time, the "show processes cpu" show 20% where as normally it is just 8-10%, nothing special in the Router. So can you please suggest? Is it a DoS attack? How can we avoid it on Core switch Cisco 3560?
0
Hi Experts,
I have a Sophos Firewall and want to use at home. I got some Information that if i use it at home then i Need Home-use license.
how can i get homelicense for it? I look at Sophos web site but i did not understand how is?

Thank you so much and Regards
0
looking for a good performance tesing tool to load test with 5000 concurrent user a b2c ecommerce site
0
switch model: Aruba 2920 48G POE+

Adding to a stack which already has 3 switches. Is it just a matter of reordering the stacking cables or is additional config required?
0
If I configure sonic wall tz300 to get WAN ip from Comcast GW DHCP, will I still be able to configure the VPN for remote access?   I am mulling several different topologies, and if this could work this seems like the easiest way.
0
What lower-layer protocol encapsulates SNMP messages?
0
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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?
0
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
0
Everyone has always said HUBs are bad and send information to ALL devices

I have an employee that needs another PC setup next to them ASAP and I do not have time to run another 100' CAT6 cable from the switch to this PC, therefore I just setup a small $10 cheap hub as follows

 1. patch cord from SWITCH to HUB
 2. patch cord from HUB to PC #1
 3. patch cord from HUB to PC #2

Which one of the below options will happens since a HUB is now in the mix when PC #2 updates a file on the Windows 2012 R2 file server since I did not wire back to the Cisco switch ?

    ** Option #1 = PC #2 sends info to ALL 100+ devices on my network, with only the file server accepting the data

    ** Option #2 = PC #2 sends info to ALL devices that are plugged into the hub (i.e. only PC #1 and the switch), with only the file server accepting the data

   ** Option #3 = something else ?
0
Hi All

I have a couple of clients with SonicWALL TZ 300 routers, and am considering having them purchase SonicWALL’s Capture Advanced Threat Protection because it seems like a damn good idea! As I understand it, it's cloud based sandbox system.

Would appreciate hearing everyone's thoughts, concerns or experiences with the product or similar products.

Thank you!

Mark
0
I have a Sonicwall NSA 3600. I have a block of Public IP's.  I have a Server 2012 vm with two IIS sites and two seperate LAN IP's configured in bindings.  One of the IIS sites has been configurd in the NSA via the wizard. The Address Object is called "web1."  

When trying to run the web server wizard for the second IIS site, i get error "Server name conflicts with existing address object" when entering the same name of "web1" which is the servers DNS name.  I change the name to "web2" and assign my LAN IP and my seperate WAN IP and it completes the wizard and creates rules.  

However, my site is not available at all. Not even by WAN.  I ensure i configure private and public DNS but it wont resolve.

Has anyone seen this issue when running to web sites from one server trying to create the firewall rules in an Sonicwall.
0
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.
0
We have ten gigabit interfaces. How much tunneled traffic would the device be able to push?
0
hi, I need to find when user loging to our web site, which address or which zip/postcode, is there is a way to do that?
Other than find broadband service provider location.
Any tools may be i can buy more help full.Thanks
0
Hi,

is it possible to get the source code of free tools?  Port Scanner for exemple
Regards
0
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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.
0
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.
0
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.
0
Hi Guys,

I had to switch our two WAN Interfaces on SonicWALL, (Thus X1 & X2)

1.  I switched the public IP configuration under Interface Settings
2.  and changed all the NAT policies, switching X1 & X2 for all rules


My questions,

a.  Is there any other rule(s) that need to be changed to switch primary internet access for LAN users between X1 & X2?

b.  I've noticed that some NAT rules refer to an "address object" rather than the interface (X1/X2) directly.  
These I did not change as the object's public address was still correct.  Is there a difference in referring to the interface (X1/X2) directly, or using an object instead?  
In my case, where I had to switch X1 & X2 ... the rules with objects made things a bit easier as it stayed the same.  Is this the only difference using an object or referencing to the interface directly?
0
Hi all,

Long time reader first time posting.

I have been asked to setup a web server inside a DMZ that can communicate with an internal database server. We have one external IP address available with port 443 currently only being used for external access to the SonicWALL. The firewall is a SonicWALL NSA 220.

The web server will be a virtual Windows 2016 server sat on ESXi on it's own vSwitch connected to a spare port on the SonicWALL which I will configure as a DMZ port. I assuming I can configure a rule on the SonicWALL that will allow ports 443 and 80 to be forwarded to this web server and allow the web server to only communicate with the database server over 1433.

An external vendor will be configuring the application that will be running on the web server.

Does this sound like a workable solution?

Tom
0
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?
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).