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I got bored playing with html forms today and what I ended up with is this nifty form that turns a given MAC address into a /48 IPv6 ULA prefix. The form POSTs this string to a cgi script which is essentially a quick re-write of the first Perl script I ever wrote (just added some html cruft to the STDOUT). I got the idea for the first script since I couldn't find a simple way to generate an ULA from my terminal. I had to open up a browser and find other similar web-based tools with a web search but several of these didn't seem to really follow the RFC, i.e. printing out a /64 instead of a /48 or printing out the prefix with no MAC address or even a field to give it one. Maybe some wayward network nerd standing up an IPv6 lab will find this useful :)
Limit of 1,208,925,819,614,629,174,706,176 ULA addresses per customer.
A pickup with three guys in it pulls into the lumber yard. One of the men gets out and goes into the office. "I need some four-by-two's," he says. "You must mean two-by-four's" replies the clerk. The man scratches his head. "Wait a minute," he says, "I'll go check." Back, after an animated conversation with the other occupants of the truck, he reassures the clerk, that, yes, in fact, two-by-fours would be acceptable. "OK," says the clerk, writing it down, "how long you want 'em?" The guy gets the blank look again. "Uh... I guess I better go check," he says. He goes back out to the truck, and there's another animated conversation. The guy comes back into the office. "A long time," he says, "we're building a house".

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