I have a leased line network with few VLAN configured, may I know how can I implement the security in order to prevent hacking from one VLAN to another VLAN or from internet. There is no firewall installed in the network. Can I implement firewall? If affirmative, how can I protect between each VLAN? They don't have to access to each other. Or should I use IDS or any other tools? Is there any freeware available? Thanks/regards
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