|
|
| |
|
| |
| In this site I will try to offer
information about
Network Quality of Service (QoS) focusing problems from a
practical point of view. The site is divided in 4 sections: |
| |
|
|
| |
 |
 |
Comments, observations,
criticisms, etc. must be done by e-mail to
Leonardo Balliache. I will try to answer all request received as
soon as I can steal some time from my schedule. |
|
| |
|
English: those interested to know what we are talking about, please have a
look to here.
Español: aquellos
interesados en saber sobre que estamos hablando, por favor den una mirada
aquí. |
 |
 |
|
| |
 |
 |
English
is not my mother language, be forgiving of my way of writing.
|
|
| |
|
|
| |
|
|
|
| |
| General
QoS information |
| |
|
An
study of network load
| |
Last year, one customer of mine called
me to evaluate some congestion problem they had in their network. The
company have had congestion problems in the LAN, very frequent
collisions in the main switch and very low performance. Because three
protocols were running in the LAN (IPX/SPX, TCP
and UDP), I suggested to make an study of the network load to
understand better what's going on, just before having any decision
about network upgrading. Here you can verify for yourself that a
network load study can be done spending very few resources, using
(free) public domain tools like tcpdump, awk, gnuplot,
and of course, an unexpensive Linux box. I hope this experience
can encourage you to make yours before having any upgrade decision.
Have a look to the document Buying
additional bandwidth is always the solution? to have a feel what
I'm talking about. |
|
|
| |
|
Flows: how
they compete for network resources
| |
I do really recommend to read this
document. My goal will be trying to explain how TCP and UDP
flows compete for scarce network resources and how these fights, when
are well understood for network administrator people, convey in better
decision criteria at the moment to make a choice. |
|
|
| |
|
Buying additional bandwidth is always
the solution?
| |
Don't let of having a read to this
document. Perhaps your mind change after reading... |
|
|
| |
|
Quality of Service
| |
This document explains briefly what is Quality of Service. |
|
|
| |
|
TCP-specific issues to improve the protocol response
| |
There has been discussions about what
kind of modification should be made to the TCP congestion control
algorithms such that the protocol response could be improved. Here
this theme is revisited. |
|
|
| |
|
Some TCP
related notes (in
progress yet...)
| |
This document summarizes some TCP
related concepts that I think are very important to understand
Internet behavior. |
|
|
| |
|
Some OSPF
related notes (in
progress yet...)
| |
Here I'm trying to make a summary of
the RFC 2328 that is very large and not easy to be readed. Also some
other documents related to the OSPF routing protocol are outlined. |
|
|
| |
|
Some MPLS
related notes (in
progress yet...)
| |
MPLS combines the best network
technology of all over the world: Traffic Engineering, QoS routing,
Resource assignment, RSVP signaling and IntServ and DiffServ
integration. |
|
|
| |
|
Some DCCP
related notes (in
progress yet...)
| |
DCCP is a new transport
protocol being designed by IETF to replace UDP for realtime
applications. |
|
|
| |
|
| |
| Linux
related QoS information |
| |
|
Differentiated Service on Linux
HOWTO (almost
ready...)
| |
This document is yet under
construction but highly advanced.
Comments, observations, criticisms, etc. are welcome and must be done by
e-mail to
Leonardo Balliache. |
|
|
| |
|
Querying libiptc HOWTO
| |
This HOWTO written by me and published by
The Linux Documentation Project explains how to use the libiptc library included in the iptables package. This document can show you how to use short C or C++ programs to query the internal structure of the firewalling code, to check chains and rules, packet and byte counters, and in a second phase, if you are a little "brave", to modify them. |
|
|
| |
|
Voice over
IP using Linux
| |
Frequently I've seen in
LARTC list questions related to
the best configuration to forward Voice over IP (VoIP) packets using Linux.
Some people compliant because they can't get the same quality of service
they get when using Cisco routers that when using Linux routers. This short
document explain why. |
|
|
| |
|
| |
| Cisco
related QoS information |
| |
|
Network
QoS using Cisco HOWTO
| |
This document explains why QoS need to be applied in current corporate LAN and WAN installations and how this technology can be implemented.
Some practical examples are given using Cisco routers. |
|
|
| |
|
Differentiated Service on
Cisco
HOWTO (almost
ready...)
| |
This document explains how to use
Cisco to create a Differentiated Service domain. If you have the
infrastructure I will be very happy to help you to make this possible;
in counterservice you help me to finish the HOWTO. In brief, do it
yourself and do not throw your money. |
|
|
| |
|
| |
|
Windows
related QoS information |
| |
|
Network
Modeling using Windows (in
progress yet...)
| |
This document presents one of the best
Network Modeling tool I ever have seen. It is written to run
on Windows, being intuitive, hardly complete, easy to use and really
very, very, very powerful. It's a pitty it costs so much. But,
don't be worried, smile please, not all is lost. There exists a
very good academic version at no cost, for us, poor people who want to
learn something new every day. Enjoy, students... |
|
|
| |
|
|
|
