i read more about secure net work but i couldn't make any thing
i want method that i could protect my net work from virus and other bad Trojan or worm that could affect badly on net and
computer??

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2- i use hotspot to authorize users and protect my net work from stranger (GHOST) whom use the net with out my order

but there is some who could change there mac address and steal password and get the net for free

how could i cutoff them the net with there new mac that they have change it ??

is there is away to make a script that make connection with user mac address and hard id serial

that if they change there mac to another,they couldn't change hard id serial ??
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my os is 3.30 on x86 and using hotspot authorization

thanks for helping

1) "virus" is far too vague a description. Different viruses behave differently. You are probably also more worried about worms. You should rather look at what symptoms you're trying to prevent and then ask the question differently.
2) you cannot prevent MAC address spoofing on a router. You need to do that at the edge (switch port or AP). The problem with securing the edge is that when you run a Hotspot, you don't want the edge secured, because that prevents customers from connecting. Search the forums for the term "netcut" for lots and lots of discussions of the topic.

thanks for your help

first i mean every thing that could affect on net work ,even virus or worms or trojan

so i want something like my antivirus but it on mikrotik router to protect network from spread of this bad things

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2- i don't want to prevent net cut ,i did it previously
but i want to protect my user or any user from change his mac address so he couldn't log with any user he know

i stick users with there mac so they couldn't use any log information except i had give it