troubleshooting Question

Network Problem

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shariqsaeedFlag for Saudi Arabia asked on
Switches / HubsWindows OSInternet Protocols
8 Comments1 Solution501 ViewsLast Modified:
Hi,

I have some problem in my network but still I don’t know what is the problem and where is the problem.

Scenario:
I have 5 Cisco Catalyst switch PoE 48 Ports (192.168.50.211 to 192.168.50.215)
I have 1 Cisco Catalyst switch 24 ports (192.168.50.216) another IP (192.168.1.254)

My main switch ip is (192.168.1.254) which is route to (192.168.1.1)
I have 1 Cisco 2800 series router for my outside branches. Which IP is (192.168.1.1) which is route to (192.168.1.6)
I have Cyberoam 250i UTM which IP is (192.168.1.6)

Approximately I have 100 Pcs with laptops and some printers etc. which is connect on my PoE 48Ports switch.
I have 16 to 20 servers.  All servers are connected my 24 Ports Switch.
I have 5 access Point which is also connected to my PoE Switch.

I have Domain controller Active Directory, DNS and DHCP (192.168.1.5)
I have Exchange Server (192.168.1.10)
I have Terminal Server (192.168.1.8)
I have application Server (192.168.1.18)


In my domain controller there is configured DHCP Scope range (192.168.1.101 to 192.168.1.109)

So now when any user connect on  network he get IP address via DHCP
For example. He gets  
IP 192.168.1.127
SM 255.255.255.0
DG192.168.1.254
DNS 192.168.1.5

Last 3 years my network was working perfectly. There was no issue. It was working perfectly fine.

Let suppose we have 50 users and some users has problem.

User1:
192.168.1.127
255.255.255.0
192.168.1.254
192.168.1.5

User2:
192.168.1.141
255.255.255.0
192.168.1.254
192.168.1.5

User3:
192.168.1.117
255.255.255.0
192.168.1.254
192.168.1.5

Now User1 suddenly he has problem. What is the problem that user can’t ping 192.168.1.5 (Domain Controller) but same time he can ping other all Ips on network. At the same time other user can ping domain controller (192.168.1.5)

I try to get reason but I couldn’t. If I log on to domain controller and go to command prompt and type ping 192.168.1.127 –t (User1) so I get request timeout then I right click on my network icon in my domain controller and click repair then I get result on reply form 192.168.1.127.
Then User1 can also ping 192.168.1.5
Same problem is my terminal server (192.168.1.8)

Suddenly User1 complain he can’t ping 192.168.1.8 > I go to my Terminal Server (192.168.1.8) > command Prompt > ping 192.168.1.127 –t > I got request time out > I right click on my network in Termainal server (192.168.1.8) and click on repait > I got reply from 192.168.1.127.

This problem I got any time and any user not only User1. All over net network any user get this Issue. If I don’t do this (repair) may be after few mins or few hours that user is working properly.

I don’t know who to find this trouble shoot. What I have to do.? But at same time which user has problem he can ping all other server.
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