23 Oct
2012
23 Oct
'12
9:52 p.m.
On Tue, Oct 23, 2012 at 9:18 AM, Mike Jones <mike@mikejones.in> wrote:
IPv4 addresses ending in .0 and .255 can't be used either because the top and bottom addresses of a subnet are unusable.
Why would hetzner be making such assumptions about what is and is not a valid address on a remote network? if you have a route to it then it is a valid address that you should be able to exchange packets with, any assumptions beyond that are almost certainly going to be wrong somewhere.
As to why: I suspect they don't know either. I wouldn't be surprised if it was someone's misguided attempt years ago to stop smurf amplification attacks, long since forgotten. I'm not saying it's a good idea (it's not), just why I suspect someone would do this.