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When you turn off, say, IPv4 forwarding, be really sure on what host you're running the command.

@liw ah, that second of calm before a flicker of "oh, wait..." and the growing sense of dread

there's no feeling quite like it

thankfully

@liw That's fine. You can just connect over IPv6. I mean, you do have IPv6 configured first, no?

If you do an "rm -rf somedir", make sure you check for NFS mounts under that directory. Don't ask me how I know ;-)
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Lars and friends