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MPLS autobandwidth

Mon, 03/07/2011 - 15:27 by Olivier Bonaventure • Categories:

Since several years, Cisco routers have included a feature called mpls autobandwidth that allows the router to compute automatically the bandwidth required for an LSP and adjust the reserved bandwidth. This feature seems interesting, but personally I have always feared that it could cause oscillations in a network if the change in reserved bandwidth leads to a change in paths for the concerned LSPs.


TCP's retransmission timeout

Mon, 03/07/2011 - 14:23 by Olivier Bonaventure • Categories:

The retransmission timeout plays an important role in allowing TCP to recover from segment losses. Over the years, extensions to TCP have been developed to reduce the reliance of TCP on the retransmission timer. Recently, a SIGCOMM paper proposed to use microsecond resolution timers in TCP. A recent IETF draft summarizes the discussions on TCP's retransmission timer, but surprisingly it does not discuss these microsecond resolution TCP timers.


Controllable per-Flow Load Balancing

Wed, 01/05/2011 - 14:22 by Gregory Detal • Categories:
Slogan: 
Classic load-balancing techniques revisited

Controlable per-Flow Load Balancing (CFLB) is an initiative to revisit current load-balancing techniques. These techniques suffer from the fact that they use hash-based functions to balance packet. This prevent hosts to control the path taken by their packets.

CFLB consists of an invertible mechanism that allows sources to easily steer packets over any load-balanced path. CFLB consists in multiple implementation parts:

* A Linux kernel implementation of the CFLB-router forwarding path.

Our members: 
Gregory Detal
Our members: 
Christoph Paasch
Programming language: 
C
Development State: 
beta

Hijacking FON user's Facebook & Twitter sessions using firesheep

Tue, 12/14/2010 - 18:42 by Damien Leroy • Categories:

In the following video, we show that it is easy (i.e. anybody can do it) to hijack FON user's sessions (i.e. access his Facebook, Twitter,... accounts) using a simple Firefox extension. You simply have to be connected on the same access point, which is an open access point in the case of FON and most hotspots.


Technical Report: RAKE payload format

Fri, 11/12/2010 - 20:33 by Gregory Detal • Categories:

H root server down for 18 hours

Mon, 10/04/2010 - 00:14 by Olivier Bonaventure • Categories:

The root servers of the Domain Name Systems are highly redundant. This redundancy is important to ensure that the root DNS service continues to be provided even if one of the DNS root servers fails. These servers are well maintained and fail rarely. However, on October 1st, the H instance of the root DNS servers maintained by the US Army failed.


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