Книга: Linux Network Administrator Guide, Second Edition

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• Preface
• Purpose and Audience for This Book
• Sources of Information
• Documentation Available via FTP
• Documentation Available via WWW
• Documentation Available Commercially
• Linux Journal and Linux Magazine
• Linux Usenet Newsgroups
• Linux Mailing Lists
• Online Linux Support
• Linux User Groups
• Obtaining Linux
• File System Standards
• Standard Linux Base
• About This Book
• The Official Printed Version
• Overview
• Conventions Used in This Book
• Submitting Changes
• Acknowledgments
• The Hall of Fame
• Chapter 1. Introduction to Networking
• History
• TCP/IP Networks
• Introduction to TCP/IP Networks
• Ethernets
• Other Types of Hardware
• The Internet Protocol
• IP Over Serial Lines
• The Transmission Control Protocol
• The User Datagram Protocol
• More on Ports
• The Socket Library
• UUCP Networks
• Linux Networking
• Different Streaks of Development
• Where to Get the Code
• Maintaining Your System
• System Security
• Chapter 2. Issues of TCP/IP Networking
• Networking Interfaces
• IP Addresses
• Address Resolution
• IP Routing
• IP Networks
• Subnetworks
• Gateways
• The Routing Table
• Metric Values
• The Internet Control Message Protocol
• Resolving Host Names
• Chapter 3. Configuring the Networking Hardware
• Kernel Configuration
• Kernel Options in Linux 2.0 and Higher
• Kernel Networking Options in Linux 2.0.0 and Higher
• A Tour of Linux Network Devices
• Ethernet Installation
• Ethernet Autoprobing
• The PLIP Driver
• The PPP and SLIP Drivers
• Other Network Types
• Chapter 4. Configuring the Serial Hardware
• Communications Software for Modem Links
• Introduction to Serial Devices
• Accessing Serial Devices
• The Serial Device Special Files
• Serial Hardware
• Using the Configuration Utilities
• The setserial Command
• The stty Command
• Serial Devices and the login: Prompt
• Configuring the mgetty Daemon
• Chapter 5. Configuring TCP/IP Networking
• Mounting the /proc Filesystem
• Installing the Binaries
• Setting the Hostname
• Assigning IP Addresses
• Creating Subnets
• Writing hosts and networks Files
• Interface Configuration for IP
• The Loopback Interface
• Ethernet Interfaces
• Routing Through a Gateway
• Configuring a Gateway
• The PLIP Interface
• The SLIP and PPP Interfaces
• The Dummy Interface
• IP Alias
• All About ifconfig
• The netstat Command
• Displaying the Routing Table
• Displaying Interface Statistics
• Displaying Connections
• Checking the ARP Tables
• Chapter 6. Name Service and Resolver Configuration
• The Resolver Library
• The host.conf File
• The nsswitch.conf File
• Configuring Name Server Lookups Using resolv.conf
• Resolver Robustness
• How DNS Works
• Name Lookups with DNS
• Types of Name Servers
• The DNS Database
• Reverse Lookups
• Running named
• The named.boot File
• The BIND 8 host.conf File
• The DNS Database Files
• Caching-only named Configuration
• Writing the Master Files
• Verifying the Name Server Setup
• Other Useful Tools
• Chapter 7. Serial Line IP
• General Requirements
• SLIP Operation
• Dealing with Private IP Networks
• Using dip
• A Sample Script
• A dip Reference
• The modem commands
• The echo command
• The get command
• The print command
• Variable names
• The if and goto commands
• send, wait, and sleep
• mode and default
• Running in Server Mode
• Chapter 8. The Point-to-Point Protocol
• PPP on Linux
• Running pppd
• Using Options Files
• Using chat to Automate Dialing
• IP Configuration Options
• Choosing IP Addresses
• Routing Through a PPP Link
• Link Control Options
• General Security Considerations
• Authentication with PPP 
• PAP Versus CHAP
• The CHAP Secrets File
• The PAP Secrets File
• Debugging Your PPP Setup
• More Advanced PPP Configurations
• PPP Server
• Demand Dialing
• Persistent Dialing
• Chapter 9. TCP/IP Firewall
• Methods of Attack 
• What Is a Firewall?
• What Is IP Filtering?
• Setting Up Linux for Firewalling
• Kernel Configured with IP Firewall
• The ipfwadm Utility
• The ipchains Utility
• The iptables Utility
• Three Ways We Can Do Filtering
• Original IP Firewall (2.0 Kernels)
• Using ipfwadm
• A na?ve example
• An important refinement
• Listing our rules
• A More Complex Example
• Summary of ipfwadm Arguments
• Categories
• Commands
• Parameters
• Optional arguments
• ICMP datagram types
• IP Firewall Chains (2.2 Kernels)
• Using ipchains
• ipchains Command Syntax
• Commands
• Rule specification parameters
• Options
• Our Na?ve Example Revisited
• Listing Our Rules with ipchains
• Making Good Use of Chains
• User-defined chains
• The ipchains support scripts
• Netfilter and IP Tables (2.4 Kernels)
• Backward Compatability with ipfwadm and ipchains
• Using iptables
• Commands
• Rule specification parameters
• Options
• Extensions
• TCP Extensions: used with -m tcp -p tcp
• UDP Extensions: used with -m udp -p udp
• ICMP Extensions: used with -m icmp -p icmp
• MAC Extensions: used with -m mac
• Our Na?ve Example Revisited, Yet Again
• TOS Bit Manipulation
• Setting the TOS Bits Using ipfwadm or ipchains
• Setting the TOS Bits Using iptables
• Testing a Firewall Configuration
• A Sample Firewall Configuration
• Chapter 10. IP Accounting
• Configuring the Kernel for IP Accounting
• Configuring IP Accounting
• Accounting by Address
• Accounting by Service Port
• Accounting of ICMP Datagrams
• Accounting by Protocol
• Using IP Accounting Results
• Listing Accounting Data with ipfwadm
• Listing Accounting Data with ipchains
• Listing Accounting Data with iptables
• Resetting the Counters
• Flushing the Ruleset
• Passive Collection of Accounting Data
• Chapter 11. IP Masquerade and Network Address Translation
• Side Effects and Fringe Benefits
• Configuring the Kernel for IP Masquerade
• Configuring IP Masquerade
• Setting Timing Parameters for IP Masquerade
• Handling Name Server Lookups
• More About Network Address Translation
• Chapter 12. Important Network Features
• The inetd Super Server
• The tcpd Access Control Facility
• The Services and Protocols Files
• Remote Procedure Call
• Configuring Remote Login and Execution
• Disabling the r; Commands
• Installing and Configuring ssh
• The ssh daemon
• The ssh client
• Using ssh
• Chapter 13. The Network Information System
• Getting Acquainted with NIS
• NIS Versus NIS+
• The Client Side of NIS
• Running an NIS Server
• NIS Server Security
• Setting Up an NIS Client with GNU libc
• Choosing the Right Maps
• Using the passwd and group Maps
• Using NIS with Shadow Support
• Chapter 14. The Network File System
• Preparing NFS
• Mounting an NFS Volume
• The NFS Daemons
• The exports File
• Kernel-Based NFSv2 Server Support
• Kernel-Based NFSv3 Server Support
• Chapter 15. IPX and the NCP Filesystem
• Xerox, Novell, and History
• IPX and Linux
• Caldera Support
• More on NDS Support
• Configuring the Kernel for IPX and NCPFS
• Configuring IPX Interfaces
• Network Devices Supporting IPX
• IPX Interface Configuration Tools
• The ipx_configure Command
• The ipx_interface Command
• Configuring an IPX Router
• Static IPX Routing Using the ipx_route Command
• Internal IPX Networks and Routing
• Mounting a Remote NetWare Volume
• A Simple ncpmount Example
• The ncpmount Command in Detail
• Hiding Your NetWare Login Password
• A More Complex ncpmount Example
• Exploring Some of the Other IPX Tools
• Server List
• Send Messages to NetWare Users
• Browsing and Manipulating Bindery Data
• Printing to a NetWare Print Queue
• Using nprint with the Line Printer Daemon
• Managing Print Queues
• NetWare Server Emulation
• Chapter 16. Managing Taylor UUCP
• UUCP Transfers and Remote Execution
• The Inner Workings of uucico
• uucico Command-line Options
• UUCP Configuration Files
• A Gentle Introduction to Taylor UUCP
• What UUCP Needs to Know
• Site Naming
• Taylor Configuration Files
• General Configuration Options Using the config File
• How to Tell UUCP About Other Systems Using the sys File
• System name
• Telephone number
• port and speed
• The login chat
• Alternates
• Restricting call times
• Identifying Available Devices Through the port File
• How to Dial a Number Using the dial File
• UUCP Over TCP
• Using a Direct Connection
• Controlling Access to UUCP Features
• Command Execution
• File Transfers
• Forwarding
• Setting Up Your System for Dialing In
• Providing UUCP Accounts
• Protecting Yourself Against Swindlers
• Be Paranoid: Call Sequence Checks
• Anonymous UUCP
• UUCP Low-Level Protocols
• Protocol Overview
• Tuning the Transmission Protocol
• Selecting Specific Protocols
• Troubleshooting
• uucico Keeps Saying "Wrong Time to Call"
• uucico Complains That the Site Is Already Locked
• You Can Connect to the Remote Site, but the Chat Script Fails
• Your Modem Does Not Dial
• Your Modem Tries to Dial but Doesn't Get Out
• Login Succeeds, but the Handshake Fails
• Log Files and Debugging
• Chapter 17. Electronic Mail
• What Is a Mail Message?
• How Is Mail Delivered?
• Email Addresses
• RFC-822
• Obsolete Mail Formats
• Mixing Different Mail Formats
• How Does Mail Routing Work?
• Mail Routing on the Internet
• Mail Routing in the UUCP World
• Mixing UUCP and RFC-822
• Configuring elm
• Global elm Options
• National Character Sets
• Chapter 18. Sendmail
• Introduction to sendmail
• Installing sendmail
• Overview of Configuration Files
• The sendmail.cf and sendmail.mc Files
• Two Example sendmail.mc Files
• Typically Used sendmail.mc Parameters
• Comments
• VERSIONID and OSTYPE
• DOMAIN
• FEATURE
• Local macro definitions
• Defining mail transport protocols
• Configure mail routing for local hosts
• Generating the sendmail.cf File
• Interpreting and Writing Rewrite Rules
• sendmail.cf R and S Commands
• Some Useful Macro Definitions
• The Lefthand Side
• The Righthand Side
• A Simple Rule Pattern Example
• Ruleset Semantics
• Interpreting the rule in our example
• Configuring sendmail Options
• Some Useful sendmail Configurations
• Trusting Users to Set the From: Field
• Managing Mail Aliases
• Using a Smart Host
• Managing Unwanted or Unsolicited Mail (Spam)
• The Real-time Blackhole List 
• The access database
• Barring users from receiving mail
• Configuring Virtual Email Hosting
• Accepting mail for other domains
• Forwarding virtual-hosted mail to other destinations
• Testing Your Configuration
• Running sendmail
• Tips and Tricks
• Managing the Mail Spool
• Forcing a Remote Host to Process its Mail Queue
• Analyzing Mail Statistics
• mailstats
• hoststat
• Chapter 19. Getting Exim Up and Running
• Running Exim
• If Your Mail Doesn't Get Through
• Compiling Exim
• Mail Delivery Modes
• Miscellaneous config Options
• Message Routing and Delivery
• Routing Messages
• Delivering Messages to Local Addresses
• Local users
• Forwarding
• Alias Files
• Mailing Lists
• Protecting Against Mail Spam
• UUCP Setup
• Chapter 20. Netnews
• Usenet History
• What Is Usenet, Anyway?
• How Does Usenet Handle News?
• Chapter 21. C News
• Delivering News
• Installation
• The sys File
• The active File
• Article Batching
• Expiring News
• Miscellaneous Files
• Control Messages
• The cancel Message
• newgroup and rmgroup
• The checkgroups Message
• sendsys, version, and senduuname
• C News in an NFS Environment
• Maintenance Tools and Tasks
• Chapter 22. NNTP and the nntpd Daemon
• The NNTP Protocol
• Connecting to the News Server
• Pushing a News Article onto a Server
• Changing to NNRP Reader Mode
• Listing Available Groups
• Listing Active Groups
• Posting an Article
• Listing New Articles
• Selecting a Group on Which to Operate
• Listing Articles in a Group
• Retrieving an Article Header Only
• Retrieving an Article Body Only
• Reading an Article from a Group
• Installing the NNTP Server
• Restricting NNTP Access
• NNTP Authorization
• nntpd Interaction with C News
• Chapter 23. Internet News
• Some INN Internals
• Newsreaders and INN
• Installing INN
• Configuring INN: the Basic Setup
• INN Configuration Files
• Global Parameters
• The inn.conf file
• Configuring Newsgroups
• The active and newsgroups files
• Configuring Newsfeeds
• The newsfeeds file
• The nntpsend.ctl file
• Controlling Newsreader Access
• The incoming.conf file
• The nnrp.access file
• Expiring News Articles
• The expire.ctl file
• Handling Control Messages
• The control.ctl file
• Running INN
• Managing INN: The ctlinnd Command
• Add a New Group
• Change a Group
• Remove a Group
• Renumber a Group
• Allow/Disallow Newsreaders
• Reject Newsfeed Connections
• Allow Newsfeed Connections
• Disable News Server
• Restart News Server
• Display Status of a Newsfeed
• Drop a Newsfeed
• Begin a Newsfeed
• Cancel an Article
• Chapter 24. Newsreader Configuration
• tin Configuration
• trn Configuration
• nn Configuration
• Appendix A. Example Network: The Virtual Brewery
• Connecting the Virtual Subsidiary Network
• Appendix B. Useful Cable Configurations
• A PLIP Parallel Cable
• A Serial NULL Modem Cable
• Appendix C. Copyright Information
• Preamble 
• Applicability and Definitions
• Verbatim Copying
• Copying in Quantity
• Modifications
• Combining Documents
• Collections of Documents
• Aggregation with Independent Works
• Translation
• Termination
• Future Revisions of this License
• Appendix D. SAGE: The System Administrators Guild
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