Hi, > Using a (once) randomly-chosen default greatly reduces the odds of > that happening. Many many people foolishly choose 10.0.{0,1,2,3}.x. > Many fewer choose (say) 172.30.206.x. So the fixed qemu default > should be 172.30.206.x, or some other range also chosen at random.
A few years back I've worked for a web company, wrote the border router firewall rules, had some rules in there to catch packages with rfc1918-private addresses in public network. Watching the statistics showed that the 172.16/12 range was _much_ less used than 10/8 and 192.168/16. I think 10/8 to be used by companies alot. 192.168.$smallnumber.0/24 seems to be a quite common default for DSL routers and the like. Thus picking a random /24 network from 172.16/12 as new default value has a pretty good chance to vastly reduce the number of clashes with existing setups. HTH, Gerd -- http://kraxel.fedorapeople.org/xenner/