Not all header fields in IP packets are used simultaneously during transmissions. Some fields may provide traceback services, especially for the defense against DDoS attacks. In this paper, we analyze which IP header fields may be used without impacting the other services provided by the IP protocol. We also analyze how unused fields can be filled for the purpose of traceback, and with what probability can a router mark packets. Finally we compare the different existing methods for packet marking based on the fields used and marking information.
L’article qui suit discute de la façon dont se caractérise la fragilité à travers le champ sanitaire et les conduites à risques chez les jeunes. La notion de fragilité y est implicite, en effet elle n’est jamais dénommée comme telle, on parle davantage de mal-être et de souffrance. Á travers l’analyse d’un prospectus du Centre Régional d’?nformation et de Prévention du Sida, l’article tente de mettre à jour les représentations des professionnels du CRIPS sur cette notion de fragilité.
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