x User’s Reference GuideSubnets and subnet masks .................................. B-2Example: Using subnets on a Class C IP internet.... B-3Example: Working with a Class C subnet ................ B-5Distributing IP addresses ............................................... B-5Technical note on subnet masking......................... B-6Configuration ....................................................... B-7Manually distributing IP addresses ........................ B-8Using address serving .......................................... B-8Tips and rules for distributing IP addresses............ B-9Nested IP subnets ....................................................... B-11Broadcasts.................................................................. B-13Packet header types........................................... B-13Appendix C — Understanding Netopia NAT Behavior...................C-1Network configuration..................................................... C-1Background ................................................................... C-1Exported services ................................................ C-5Important notes ................................................... C-6Configuration ................................................................. C-7Summary ...................................................................... C-8Appendix D — Binary Conversion Table......................................D-1Appendix E — Further Reading.................................................. E-1Appendix F — Technical Specifications and Safety Information... F-1Pinouts for Auxiliary port modem cable............................ F-1Description.................................................................... F-3Power requirements ............................................. F-3Environment ........................................................ F-3Software and protocols......................................... F-3Agency approvals........................................................... F-4Regulatory notices ............................................... F-4Important safety instructions ................................ F-6Glossary.................................................................................. GL-1