The paper "ISP and Egress Path Selection for Multihomed Networks" written by Dhamdhere and Dovrolis and presented at IEEE INFOCOM'06 discusses a solution to select the best ISPs for multihommed stub depending on traffic patterns of the stub.

The idea is simple, first, determine the traffic top X prefixes of the stub. Determine the possible ISPs for the stub and use stochastic techniques to detemine the subset of ISP to subscribe to and how to perform the best egress path selection.

The paper titeled "Bandwidth estimation: metrics, measurement techniques, and tools" (R Prasad, C Dovrolis, M Murray, K Claffy - Network, IEEE, 2003) is divided in three main chapters. First, it defines the three following metrics:
- Capacity: the maximum possible IP layer transfer rate.
- Available bandwidth: the unused, or spare, capacity of a link during a certain time period.
- Bulk Transfer Capacity (BTC): the maximum throuhput obtainable by a single TCP connection (depends on many factor like rtt, window size, TCP implementation).

Introduction

In this small tutorial, we present how to setup CentOS guests with the standard tools proposed by CentOS.

By default, CentOS gives good tools to rapidly create networked guests, see by yourself:

Host preparation

• Configure Xen for private networking:
  1. Virtual networks can be configured in /etc/libvirt/qemu/networks/autostart/default.xml. The default configuration is good enough for us but feel free to modify it:
     

     <network>
       <name>default</name>