Blogs

Pathload: a measurement tool for end-to-end available bandwidth

Thu, 03/27/2008 - 14:27 by Damien Saucez • Categories:

The paper "Pathload: a measurement tool for end-to-end available bandwidth" presented at the PAM'02 conference by M. Jain and C. Dovrolis presents an tool to estimate the available end-to-end bandwidth.

The Pathload tools is build on the Self-Loading Periodic Streams (SLoPS) (see [08-03-17]).


LAN Switch Security : What hackers know about your switches

Wed, 03/26/2008 - 21:48 by Olivier Bonaventure • Categories:

Ethernet is now the default fixed Local Area Network technology. Ethernet LANs are found in all entreprise environments and in more and more home networks. Ethernet was designed in the 1970s when security was not a concern. Since then, Ethernet has evolved with the introduction of hubs and switches. Many network administrators are aware that hubs are a security concern since they broadcast Ethernet frames and some of them assume that switches or more secure.


On-the-fly TCP path selection algorithm in access link load balancing

Mon, 03/24/2008 - 13:35 by Damien Saucez • Categories:

The paper "On-the-fly TCP path selection algorithm in access link load balancing" written by Lin et al. proposes a new way to implement load balancer based on NAT.

Traditional load-balancer uses weighted round robin to define the uplink to use for a given stream. The model proposed by the authors deals only with TCP flows.


Practical large-scale latency estimation

Sun, 03/23/2008 - 13:05 by Damien Saucez • Categories:

The paper "Practical large-scale latency estimation" written by Szymaniak et al., presents an architecture able the estimate latency of millions of nodes in an efficient manner.

The idea of the paper is to propose CDNs like Google to determine the best server for any client.

To do so, the authors uses GNP, a landmarks-based network coordinate system. First, they establish a base of 7 redundant landmarks which computes their coordinates based on active probing.


IPv6 delay and loss performance evolution

Wed, 03/19/2008 - 10:30 by Damien Saucez • Categories:

The paper titled "IPv6 delay and loss performance evolution" written by Zhou et al. in the International Journal of Communication Systems proposes to analyze the performances of IPv6 paths compared to IPv4 paths between the same nodes.

The dataset is the RIPE database between the October 1st, 2003 and October 31th 2005. The principle is simple: process the RIPE database for the TTM boxes running both IPv4 and IPv6 and compare the performances in term of delay and loss ratio for the two protocols.


On the Performance Benefits of Multihoming Route Control

Mon, 03/17/2008 - 18:19 by Damien Saucez • Categories:

The paper "On the Performance Benefits of Multihoming Route Control" written by A Akella et al. in IEEE/ACM Transactions on Networking February 2008 estimates the possible gain of performances while correctly route traffic in multihomed enterprise environments.

The paper focus on two metrics: the RTT (called turnaround time) and the throughput of http-based downloads.


Avoiding Oscillations due to Intelligent Route Control Systems

Mon, 03/17/2008 - 13:55 by Damien Saucez • Categories:

Intelligent Route Control systems are tools that give the oportunity for multihomed ASes to modify the routes according to some performance criteria.

The paper "Avoiding Oscillations due to Intelligent Route Control Systems" written by Gao et al. at INFOCOM'06 shows, like the paper "Can Coexisting Overlays Inadvertenly Step on Each Other" (Keralapura et al., ICNP'05), that IRCs can lead to traffic oscilliations causing performances degradation.

The paper pin-points that the problem comes from two pitfalls:


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