One of my readers sent me a link to an interesting L2-over-IP "design". Someone tried to connect two data centers with redundant etherip links using home-brewed redundancy mechanism and (surprise, surprise) managed to bring both of them down. The obvious fix: patch the etherip device driver.
I don't know enough about OpenBSD to figure out whether (A) it doesn't have STP at all, (B) STP doesn't work over EtherIP, (C) host routing based on ARP entries would be too much of a hassle, (D) some people don't understand the networking fundamentals, (E) everything looks like a nail once you found a hammer, or (F) all of the above. Insightful comments would be highly appreciated.