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HP 9000 Networking: Installing and Administering PPP
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HP Part Number: B2355-90137

Edition: Edition 1

Published: E0497

© Copyright 1997, Hewlett-Packard Company. .

Table of Contents

Printing History
Preface
1 Introduction
Product Overview
Dialing In to an HP 9000
Dialing Out from an HP 9000
Direct Connections
HP-UX PPP Features
PPP and SLIP
Installation
2 Setting Up PPP Connections
Configuration Overview
How PPP Connections are Established
Configuration Quick Reference
Creating Device Files for Serial Ports
Increasing the Number of IP Tunnels
Configuring Your Modem
Configuring Outbound Connections
/etc/ppp/Devices
/etc/ppp/Dialers
/etc/ppp/Systems
/etc/ppp/Autostart
Configuring Inbound Connections
/etc/passwd
Login Shell Script
Checking Permissions
Testing the Connection
Additional Information
Non-Generic Login Scripts
Creating a Simple Filter File
Note on Systems and Devices Entries
IP Addresses on the pppd Command Line
3 SLIP to PPP Migration
SLIP and PPP Configuration Files
Migration Examples
Case 1: Dialout SLIP Connection without UUCP System Name
Case 2: Direct SLIP Connection without UUCP System Name
Case 3: Dialout SLIP Connection with UUCP System Name
Setting up Outbound PPP Connections
Setting up Inbound PPP Connections
Accounting and Logging
ppl.users and ppl.ipool
SLIP and PPP Interoperability
Flow Control
4 Common pppd Options
Link Management
Active vs. Passive PPP Negotiations
Idle Timer Link Control
The exec Option
Parent Environment and Session Variables
Example
SLIP Framing Option
SLIP Data Compression
Using SLIP to Dial a Cisco Terminal Server
Link Quality Monitoring
Guides for Evaluation of Link Quality
Adjusting LQM Behavior
Weighing the Costs of LQM
LQM Response to Link Failures
Failure Without Disconnection
Peer Refusal to Comply with LQM Request
Compression
HDLC Frame Compression
Address and Control Field Compression
Protocol Field Compression
Van Jacobson TCP Header Compression
PPP Link Compression
Predictor-1
Stac Compression
Unique PPP Implementations
Synchronous PPP
Dedicated Lines
Automatic Failover
Constantly-Open Telephone Calls
IP Routing Tips
Connecting a Host to a LAN
Connecting Two LANs
Connecting a Host or LAN to the Internet
5 Security Techniques
Static Packet Filtering
The Foundations of Security Policies
Filter File Rulesets
Filters
Filter Stanzas
Packets Overview
Internet Protocol (IP) Level
Internet Control Message Protocol (ICMP) Level
Transmission Control Protocol (TCP) Level
User Datagram Protocol (UDP) Level
Building a Stanza - General
Building a Stanza - Specifics
Numbers and Addresses
Keywords with Numbers
Keywords with Origins and Destinations
Keywords Based on TCP Packet Header Bits
Keywords Based on IP Options
frag Keyword
all Keyword
Time-Based Keywords
Unreach Keyword and Sending ICMP Messages
Log and Trace Keywords
Stanza Syntax
Writing a Stanza - A Complex UDP Example
An Unsafe Domain Name System Rule
What Happens During Domain Name Queries
Developing Safer Domain Name Request Rules
Writing a Stanza - TCP Examples
Two Approaches to Filtering TCP connections
Identifying Rulesets with Hostnames and Addresses
A Note on Ruleset Formatting
Ordering Stanzas Effectively
Isolating an 'Incorrect' Stanza
Working with Default Rulesets
Open Policy Default Rulesets
A Note on Using the 'log rejected' Filter
Closed Policy Default Rulesets
Block All Packets
Block All Packets Except Electronic Mail
Limiting Electronic Mail to a Gateway
Unresolvable Hostnames and Changing IP Addresses
Conclusion
A Note - Blocking Loose Source and Strict Source Routing Options
Closed Policy Filter Example
Complete Filter Example
Open Policy Filter Example
Common Mistakes
Complete Filter Example
Time-To-Call Restrictions
Dial-Back
Dial-Back Process
Blocking SIGHUP with Chat Script \M Option
Reversing Instructions with \m Option
Link Peer Authentication
Replacing getty with pppd
6 Troubleshooting pppd
A Modem Connections
RS-232 Interface
DB-25
DB-9
DB-9 to DB-25 Conversion
HP Modem Cables
Null-Modem Cables
Dial Up Modems
Speed
Data Compression
Error Correction
Flow Control
Modem Commands
S Registers
Common Modem Configurations
Enabling Hardware Flow Control
Glossary
Index

List of Figures

2-1 PPP Connection Example
2-2 PPP Connection Example (continued)
4-1 Title not available (Separate Network)
4-2 Title not available (ARP Table Manipulation)
4-3 Title not available (Connecting Two LANs)
5-1 Title not available (Internet Protocol (IP) Level)
5-2 Title not available (Internet Control Message Protocol (ICMP) Level)
5-3 Title not available (Transmission Control Protocol (TCP) Level)
5-4 Title not available (User Datagram Protocol (UDP) Level)

List of Tables

3-1 Relationship of SLIP and PPP Configuration Information
   


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© 1997 Hewlett-Packard Development Company, L.P.