The question on the speed and dropping!

Users questions: Introduction of LAN: LAN units, there are some people directly to the switch fabric, and then there are two routers connected from the switch out, respectively, in both the router connected to 8 by the computer (equivalent to 2 split.) I and another three colleagues in another building because, it is also a router from In the connection. But the router does not know is directly connected to the switch or router in one of two above, if it is possible that we belong to the latter three times the diversion. Problems: 1 unit now afford to go often baffling network of people call the computer company's point of view, the result is often people come here Looking for a long time could not find fault, or even who first came to the network to self-recover. 2, the computer I used the Internet not open web pages are generally required to refresh 1-3 times to open, but can open or the next thing, that speed is normal (4M). Only a few of us the entire unit to the same routing Control of people face this problem, and sometimes even dropped a few of us, colleagues in other units are not dropped, I have installed the ARP firewall, but the situation remains the same, now do not understand how it was. Under the expert advice, please! The speed limit is now too powerful software, firewalls does not work Oh! Ask ARP Norton firewall can prevent it? Made in China have tried, if not the line-like. Who recommended first paragraph in your firewall, oh
Experts answer: units of each machine on the virus, there are 2 reasons 1. Hardware problems (in the basic rule) 2. Is a router, ARP virus attacks, ARP Firewall Can only protect you, can not be protected router. See if you open network packet capture tools that machine's network card in chaos mode, the machine is a machine in a move
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