Something doesn't quite add up, when I put:
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i am quite new to this by the way..
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together with
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As a matter of fact, I DO know what NAT is. As a thesis I implemented NIProxy (network intelligence) which is a network traffic shaping device. So please stop saying I don't know what NAT is.
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The ASCII "picture" of your network, repeated here:
Quote:
(internet)-(81.242.5.xxx - router - 192.168.0.1)-(192.168.0.x - openbsd - 192.168.1.1)-(192.168.1.x - clients)
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is what I based my judgement on, which shows the OpenBSD platform acting as a second router.
IF instead, the topology is one where the OpenBSD platform is on the same
physical network as the externally facing router and your sixty students, with two NICs on different IP subnets on the same physical network then there will be a lot of packet replication, but NAT is still not of value, AFAICT.
Since nothing I have told you is acceptable, or apparently applicable to your environment, then by all means, do whatever you wish. It is your network, and, when you break it, you get to keep the pieces.