HP-UX IPFilter A.03.05.13 Administrator's Guide: HP-UX 11i v3
Table Of Contents
- HP-UX IPFilter Version A.03.05.13 Administrator's Guide
- Legal Notices
- Table of Contents
- Preface: About This Document
- 1 Installing and Configuring HP-UX IPFilter
- Overview of HP-UX IPFilter Installation
- Step 1: Checking HP-UX IPFilter Installation Prerequisites
- Step 2: Loading HP-UX IPFilter Software
- Step 3: Determining the Rules for IPFilter
- Step 4: Adding Rules to the Rules Files
- Step 5: Loading IPFilter and NAT Rules
- Step 6: Verifying the Installation and Configuration
- Kernel Tunable Parameters
- Supported and Unsupported Interfaces
- Troubleshooting HP-UX IPFilter
- 2 HP-UX IPFilter on HP-UX 11i Version 3
- 3 Rules and Keywords
- IPFilter Configuration Files
- Basic Rules Processing
- IPFilter Keywords
- pass and block: Controlling IP Traffic
- in and out: Bidirectional Filtering
- quick: Optimizing IPFilter Rules Processing
- on: Filtering by Network Interfaces
- from and to: Filtering by IP Addresses and Subnets
- log: Tracking Packets on a System
- proto: Controlling Specific Protocols
- opt and ipopts: Filtering on IP Options
- icmp-type: Filtering ICMP Traffic by Type
- port: Filtering on TCP and UDP Ports
- keep state: Protecting TCP, UDP, and ICMP Sessions
- flags: Tight Filtering Based on TCP Header Flags
- keep frags: Letting Fragmented Packets Pass
- with frags: Dropping Fragmented Packets
- with short: Dropping Short Fragments
- return-rst: Responding to Blocked TCP Packets
- return-icmp: Responding to Blocked ICMP Packets
- dup-to: Drop-Safe Logging
- NAT Keywords
- 4 Dynamic Connection Allocation
- 5 Firewall Building Concepts
- Blocking Services by Port Number
- Using Keep State
- Using Keep State with UDP
- Using Keep State with ICMP
- Logging Techniques
- Improving Performance with Rule Groups
- Localhost Filtering
- Using the to
- Creating a Complete Filter by Interface
- Combining IP Address and Network Interface Filtering
- Using Bidirectional Filtering Capabilities
- Using port and proto to Create a Secure Filter
- 6 HP-UX IPFilter Utilities
- 7 HP-UX IPFilter and FTP
- 8 HP-UX IPFilter and RPC
- 9 HP-UX IPFilter and IPSec
- 10 HP-UX IPFilter and Serviceguard
- A HP-UX IPFilter Configuration Examples
- B HP-UX IPFilter Static Linking
- C Performance Guidelines
- Index
Installing and Configuring HP-UX IPFilter
Kernel Tunable Parameters
Chapter 1 17
ipl_suppress
The tunable ipl_suppress can be used to modify the logging behavior of
HP-UX IPFilter for identical records. By default, the value is set to 1.
Therefore, when HP-UX IPFilter encounters identical records, it does not
print every record but prints the record and N where N is the number of
times the record was repeated. If the value is set to 0 using kctune, all
the records, including duplicate records, are printed.
For information on changing the ipl_suppress variable, see
“Configuring Kernel Tunable Parameters” on page 17.
ipl_logall
When logging is enabled, HP-UX IPFilter logs the first 128 bytes of the
packet. By setting the value of the ipl_logall kernel tunable to 1, you
can log the entire packet. Logging the entire packet quickly fills the log
files and, therefore, care should be taken while enabling the ipl_logall
tunable.
For information on changing the ipl_logall variable, see “Configuring
Kernel Tunable Parameters” on page 17.
Configuring Kernel Tunable Parameters
The kctune command can be used to query and configure HP-UX
IPFilter kernel tunable parameters.
To query the value of a kernel tunable, enter the kctune command with
the kernel tunable. For example:
kctune ipl_logall
Tunable
Name
Default
Value
Minimum
Value
Maximum
Value
ipl_suppress 10 1
Tunable
Name
Default
Value
Minimum
Value
Maximum
Value
ipl_logall 00 1