How secure is a network if the unprotected subnet 12.xxx.xxx.xxx and protected subnets 10.1.xxx.xxx and DMZ subnet 192.168.xxx.xxx are on the same physical wire. It seems to me that this is a disaster waiting to happen.
I am helping a friend at a small company and need help by pointing to industry best practices to defend taking this apart and starting over. any pointers to documentation is greatly appreciated.
Barry Streets
I don't think I get this. If you have 3 networks on one wire please explain how one us 'unprotected' and 2 are 'protected'.
You are talking about VLANS yes? If you are please send a diagram. VLANS can be secure if done correctly. However, it is probably best to use separate interfaces....send a diagram.
Michael
If these are on the same wire, then you are either VLANing or routing. If you are doing either, rules can be applied to restrict/limit traffic. Further any type of hardware firewall can also be inserted to add rules. Your question is just too general to get any more specific.
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