Also change one case of blatant __progname abuse (several more remain) This commit does not touch anything in src/{contrib,crypto,gnu}/.
To do this you need to have each top-end connected as well. IP can be routed and other protocols get bridged.. Also useful when bridgeing two networks while merging them as machines will work with both old and new netmasks. (well mostly).
PR: 24839 Submitted by: AMAKAWA Shuhei <amakawa@sf.t.u-tokyo.ac.jp>
