This reverts commit 1dc21e5bc5.

* May bike-shed the ipv4 address to a class A.

* 172 is generally used for auto-config... so it fits
  well with the ad-hoc mesh nature of Netsukuku
* IPv6 could be limited to a uni-cast local address
  as well.

* Style varied wildly between files and within files.
* find . -name "*.c" -exec indent {} -ut -ts4 -kr -psl \;
* find . -name "*.h" -exec indent {} -ut -ts4 -kr -psl \;

* That isn't how you use those.