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on my regular (untagged) lan, different ipv4 and ipv6 networks are used. subnets to talk to each other through the router, because the pi did not send the traffic to the router, but tried to send it as if the then, suddenly, i remembered that i had to restart that stupid switch because i had to move its power brick to a different outlet: somehow while booting it ignored all vlan configuration, so for a few seconds the pi was connected to the main vlan, got the route advertisment whiche for some reason dhcpcd kept hanging on and dutifully re-adding every time i deleted it. of course i found an answer to this in a collection of stack overflow questions, but to make things easier for anybody who might stumble into this post (and mainly for future me), here’s the answer. basically i have a command that sometimes produces an error, but usually just re-running it produces the correct output. when it encounters an error, it dutifully sets its error code to something other than 0 (success). but how to i capture both the command’s so i made a little wrapper script that repeatedly calls the first one until it gets an answer, with a set maximum number of retries to avoid command must be first executed outside of the while loop: # bash does not have a do...while construct i usually store my containers and vms on the local 180 gb ssd that used to be in my old macbook pro, since it’s reasonably fast and it works well, but i wanted to experiment with nfs-backed storage off my freenas box (4x4tb wd reds in raidz1, 16 gbs of ram, an i5–3330 frankly, i was pretty unsatisfied with the performance i was getting. everything felt pretty slow, especially compared to the internal ssd and, surprisingly, to storing the same data on a little wd mycloud (yes, the one with the handy built-in backdoor my very unscientific test was creating a fresh container based on ubuntu 16.04, and upgrading the stock packages that came with it. as the task was completed in around 1’30″ with the container on the internal ssd, 2’10″ on the wd mycloud, and an embaras*ing