[QUOTE]\nYou have not been doing your homework. Have you actually tried to get 253\nnetmask using "the bits?" You can't get there.[/QUOTE]\n\nYeou can[*].\n\n[QUOTE]\nCIDR Prefix from left to right.[/QUOTE]\n^^^^ ^^^^^^\n1 2\n\n1) => Classless Inter-Domain Routing\nIt's not primary about 'continuos Bits'\n\n2) Of course you asume _continuos_ bits when using "/prefix"-Notation...\n\n\n[QUOTE]\nDiscontiguous networks are ugly[/QUOTE]\n\nMay be.\n[QUOTE]\nand a sign you did not do your work right. \nWhy?\n\nThat can not be fixed with a netmask real or imaginary. It will require a\nrouter and a protocol that understands classless routing-that leaves RIPv1\nand IGRP off the list.[/QUOTE]\n\n\nNobody said that 'discontinous Maks' are fun :-)\nBut nobody _proofed_ that they are *formally* *forbidden*\n\n\nIf you seek for "netmask 255.255.0.255" in groups.google.de, you'll\nget a lot ( fourteen :-) of answers.\n\nOne of them states, that "an old AIX" might use them.\n[ Message-ID: <> ]\n\n\n\nGreetings, Holger\n\n[*] A "Zungenbrecher" from my old english-textbook:\n\na canner can can\neverything he can can\nbut can a canner can a can?