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Old 24th April 2010
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
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Draw a picture for us, Idosch. Explain how you envision several devices on the same physical subnet can be protected from each other, merely by having yet another device on the same physical subnet running OpenBSD.

All ALIAS does is permit a NIC to respond to an ARP request for multiple addresses. Each alias address -must- be within the subnet, else the gateway router will not even ask. If you changed the gateway's routing table and added a pseudo-subnet that you then "routed" to the OpenBSD platform, how would it then forward packets on? NAT? You'll need to draw this out, and describe both layer 2 frames (Ethernet) as well as layer 3 (IP). Doing that exercise will tell you whether or not this will work, or, will give you more specific questions to ask.
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