Linux Advanced Routing & Traffic Control HOWTO

Bert Hubert

Netherlabs BV

<bert.hubert at netherlabs.nl>

Gregory Maxwell

<greg at linuxpower.cx>

Remco van Mook

<remco at virtu.nl>

Martijn van Oosterhout

<kleptog at cupid.suninternet.com>

Paul B Schroeder

<paulsch at us.ibm.com>

Jasper Spaans

<jasper at spaans.ds9a.nl>

Revision History
Revision 1.1	2002-07-22
DocBook Edition

A very hands-on approach to iproute2, traffic shaping and a bit of netfilter.

Table of Contents

1. Dedication

2. Introduction

2.1. Disclaimer & License
2.2. Prior knowledge
2.3. What Linux can do for you
2.4. Housekeeping notes
2.5. Access, CVS & submitting updates
2.6. Mailing list
2.7. Layout of this document

3. Introduction to iproute2

3.1. Why iproute2?
3.2. iproute2 tour
3.3. Prerequisites
3.4. Exploring your current configuration
3.5. ARP

4. Rules - routing policy database

4.1. Simple source policy routing
4.2. Routing for multiple uplinks/providers

5. GRE and other tunnels

5.1. A few general remarks about tunnels:
5.2. IP in IP tunneling
5.3. GRE tunneling
5.4. Userland tunnels

6. IPv6 tunneling with Cisco and/or 6bone

6.1. IPv6 Tunneling

7. IPsec: secure IP over the Internet

8. Multicast routing

9. Queueing Disciplines for Bandwidth Management

9.1. Queues and Queueing Disciplines explained
9.2. Simple, classless Queueing Disciplines
9.3. Advice for when to use which queue
9.4. Terminology
9.5. Classful Queueing Disciplines
9.6. Classifying packets with filters
9.7. The Intermediate queueing device (IMQ)

10. Load sharing over multiple interfaces

10.1. Caveats
10.2. Other possibilities

11. Netfilter & iproute - marking packets

12. Advanced filters for (re-)classifying packets

12.1. The u32 classifier
12.2. The route classifier
12.3. Policing filters
12.4. Hashing filters for very fast massive filtering

13. Kernel network parameters

13.1. Reverse Path Filtering
13.2. Obscure settings

14. Advanced & less common queueing disciplines

14.1. bfifo/pfifo
14.2. Clark-Shenker-Zhang algorithm (CSZ)
14.3. DSMARK
14.4. Ingress qdisc
14.5. Random Early Detection (RED)
14.6. Generic Random Early Detection
14.7. VC/ATM emulation
14.8. Weighted Round Robin (WRR)

15. Cookbook

15.1. Running multiple sites with different SLAs
15.2. Protecting your host from SYN floods
15.3. Rate limit ICMP to prevent dDoS
15.4. Prioritizing interactive traffic
15.5. Transparent web-caching using netfilter, iproute2, ipchains and squid
15.6. Circumventing Path MTU Discovery issues with per route MTU settings
15.7. Circumventing Path MTU Discovery issues with MSS Clamping (for ADSL, cable, PPPoE & PPtP users)
15.8. The Ultimate Traffic Conditioner: Low Latency, Fast Up & Downloads
15.9. Rate limiting a single host or netmask

16. Building bridges, and pseudo-bridges with Proxy ARP

16.1. State of bridging and iptables
16.2. Bridging and shaping
16.3. Pseudo-bridges with Proxy-ARP

17. Dynamic routing - OSPF and BGP

18. Other possibilities

19. Further reading

20. Acknowledgements

HOWTOs

Linux Advanced Routing & Traffic Control HOWTO

Bert Hubert