This is interesting. I sometimes have to connect to a VPN that crashes when something provokes a burst of activity (if I cat a file or even ls a large dir). I'll try this, but 576 seems so low; how did you get at this number?
This is what I want to know - the article doesn't explain.
I guess its a number that particular (old?) routers / particular firewalls won't fragment the packet..?
Wikipedia says 576 is the minimum for IPv4. I suppose then that the author just went for the value all hosts should support.