Unstable Internet when using two hubs

I have public static IPs to access the Internet, which are provided by a company. I used two hubs and one router to configure my network as shown on the left side of the given figure. This configuration almost works without any malfunction. However, I sometimes cannot access the Internet and other computer as well. For example, a computer has an IP (A.B.C.16) cannot access the Internet. At that time, I try to ping other computer such as IP (A.B.C.01 or 100). Besides, I also do the same ping with other computer. The response from ping command state that all the computer do not connect to the Router (A.B.C.0).

Consequently, it leads me to restart two hubs (hub_1, and hub_2). The Internet comes for a while and leaves. I guess there might have some problems with the Router, but I cannot do anything since the company managed it.

I try another approach by replacing hub_2 with a switch as shown in the right side of the given figure. This way brings the Internet stable, but all the computer connected the switch are in a private network. Specifically, other computer connected to hub_1 cannot connect to them.

Can anyone explain why the problem occurs when I use two hubs (hub_1, hub_2)?

Figure:

1 Answer
1

There really isn't much information to work with here.
Is the Internet Router the one providing DNS connectivity ? Do you have a server in your layout. ( Based on pictures I would say no. )
You say you have a Static IP internet connection. How do the local computers get their IP addresses?

Based if you are thinking the hubs are the source of your problems; theses could be the issues.

A Hub will take a network packet and just transmit the packet down all other ports. for that reason it is some times known as a repeater.

What could be happening is...

The Fix....
Check for Malware. Keep a good antivirus and keep it updated.
Hubs are generally not very good for interconnection so you may want to consider switching it out.

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