(OK) Ipsysctl tutorial 1.0.4 - /proc/sys/net/

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Ipsysctl tutorial 1.0.4

Oskar Andreasson

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Copyright © 2002 by Oskar Andreasson

Permission is granted to copy, distribute and/or modify thisdocument under the terms of the GNU Free Documentation License, Version1.1; with the Invariant Sections being "Introduction" and allsub-sections, with the Front-Cover Texts being "Original Author: OskarAndreasson", and with no Back-Cover Texts. A copy of the license isincluded in the section entitled "GNU Free Documentation License".

All scripts in this tutorial are covered by the GNU General PublicLicense. The scripts are free source; you can redistribute them and/ormodify them under the terms of the GNU General Public License as publishedby the Free Software Foundation, version 2 of the License.

These scripts are distributed in the hope that they will beuseful, but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU GeneralPublic License for more details.

You should have received a copy of the GNU General PublicLicense within this tutorial, under the section entitled "GNU GeneralPublic License"; if not, write to the Free Software Foundation, Inc., 59Temple Place, Suite 330, Boston, MA 02111-1307 USA

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Dedications

This document is dedicated to all of you who send me reports ofbugs and errors in what I have written, and to everyone else for thatmatter who reads this and other documentations in order to find errors andreport them to the maintainers. This document is in other words dedicatedto everyone who uses what others produce and release for free under theFree Licenses that are available.

I would also like to dedicate this to my family who has understood me whenI didn't deserve it, who whacked my head off for being a bum when Ideserved it, and for being a generally nice bunch of people with a lot ofhumour.

Table of Contents

Preface

1. Why this document

2. Intended audience & prerequisite knowledge

3. How to read

4. Conventions used in this document

5. Acknowledgements

1. Introduction

1.1. Virtual filesystems

1.2. The /proc filesystem

1.3. A brief /proc walkthrough

2. How to set variables

2.1. With the sysctl application

2.2. With /proc

3. IPv4 variable reference

3.1. IP Variables

3.1.1. ip_autoconfig

3.1.2. ip_default_ttl

3.1.3. ip_dynaddr

3.1.4. ip_forward

3.1.5. ip_local_port_range

3.1.6. ip_no_pmtu_disc

3.1.7. ip_nonlocal_bind

3.1.8. ipfrag_high_thresh

3.1.9. ipfrag_low_thresh

3.1.10. ipfrag_time

3.2. Inet peer storage

3.2.1. inet_peer_gc_maxtime

3.2.2. inet_peer_gc_mintime

3.2.3. inet_peer_maxttl

3.2.4. inet_peer_minttl

3.2.5. inet_peer_threshold

3.3. TCP Variables

3.3.1. tcp_abort_on_overflow

3.3.2. tcp_adv_win_scale

3.3.3. tcp_app_win

3.3.4. tcp_dsack

3.3.5. tcp_ecn

3.3.6. tcp_fack

3.3.7. tcp_fin_timeout

3.3.8. tcp_keepalive_intvl

3.3.9. tcp_keepalive_probes

3.3.10. tcp_keepalive_time

3.3.11. tcp_max_orphans

3.3.12. tcp_max_syn_backlog

3.3.13. tcp_max_tw_buckets

3.3.14. tcp_mem

3.3.15. tcp_orphan_retries

3.3.16. tcp_reordering

3.3.17. tcp_retrans_collapse

3.3.18. tcp_retries1

3.3.19. tcp_retries2

3.3.20. tcp_rfc1337

3.3.21. tcp_rmem

3.3.22. tcp_sack

3.3.23. tcp_stdurg

3.3.24. tcp_syn_retries

3.3.25. tcp_synack_retries

3.3.26. tcp_syncookies

3.3.27. tcp_timestamps

3.3.28. tcp_tw_recycle

3.3.29. tcp_window_scaling

3.3.30. tcp_wmem

3.4. ICMP Variables

3.4.1. icmp_echo_ignore_all

3.4.2. icmp_echo_ignore_broadcasts

3.4.3. icmp_ignore_bogus_error_responses

3.4.4. icmp_ratelimit

3.4.5. icmp_ratemask

3.4.6. igmp_max_memberships

3.5. The conf/ variables

3.5.1. conf/DEV/, conf/all/ and conf/default/ differences

3.5.2. accept_redirects

3.5.3. accept_source_route

3.5.4. arp_filter

3.5.5. bootp_relay

3.5.6. forwarding

3.5.7. log_martians

3.5.8. mc_forwarding

3.5.9. proxy_arp

3.5.10. rp_filter

3.5.11. secure_redirects

3.5.12. send_redirects

3.5.13. shared_media

3.6. Neigh reference

3.7. Netfilter reference

3.7.1. ip_ct_generic_timeout

3.7.2. ip_ct_icmp_timeout

3.7.3. ip_ct_tcp_be_liberal

3.7.4. ip_ct_tcp_log_invalid_scale

3.7.5. ip_ct_tcp_log_out_of_window

3.7.6. ip_ct_tcp_timeout_close

3.7.7. ip_ct_tcp_timeout_close_wait

3.7.8. ip_ct_tcp_timeout_established

3.7.9. ip_ct_tcp_timeout_fin_wait

3.7.10. ip_ct_tcp_timeout_last_ack

3.7.11. ip_ct_tcp_timeout_listen

3.7.12. ip_ct_tcp_timeout_none

3.7.13. ip_ct_tcp_timeout_syn_recv

3.7.14. ip_ct_tcp_timeout_syn_sent

3.7.15. ip_ct_tcp_timeout_time_wait

3.7.16. ip_ct_udp_timeout

3.7.17. ip_ct_udp_timeout_stream

3.8. Route reference

3.8.1. error_burst

3.8.2. error_cost

3.8.3. flush

3.8.4. gc_elasticity

3.8.5. gc_interval

3.8.6. gc_min_interval

3.8.7. gc_thresh

3.8.8. gc_timeout

3.8.9. max_delay

3.8.10. max_size

3.8.11. min_adv_mss

3.8.12. min_delay

3.8.13. min_pmtu

3.8.14. mtu_expires

3.8.15. redirect_load

3.8.16. redirect_number

3.8.17. redirect_silence

A. Measurements used in kernel

A.1. Jiffies

B. Other resources

C. History

D. GNU Free Documentation License

0. PREAMBLE

1. APPLICABILITY AND DEFINITIONS

2. VERBATIM COPYING

3. COPYING IN QUANTITY

4. MODIFICATIONS

5. COMBINING DOCUMENTS

6. COLLECTIONS OF DOCUMENTS

7. AGGREGATION WITH INDEPENDENT WORKS

8. TRANSLATION

9. TERMINATION

10. FUTURE REVISIONS OF THIS LICENSE

How to use this License for your documents

E. GNU General Public License

0. Preamble

1. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

2. How to Apply These Terms to Your New Programs

List of Tables

A-1. Jiffies on different hardware

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