Rewrote section explaining IP Addresses. Thanks Bryan Kadzban and Bruce Dubbs. Resolves Ticket 1663. Merged from trunk r7501.
git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/udev_update/BOOK@7507 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689