F - ETX: an enhancement of the ETX metric for mobile wireless networks S.Bindel 1 , sbindel@labri.fr S.Chaumette 1 serge.chaumette@labri.fr B.Hilt 2 benoit.hilt@uha.fr 1 LaBRI, University of Bordeaux, France 2 MIPS, University of Haute Alsace, France