RLC layer can be bypassed by changing the following part in ns/tcl/lib/ns-mobilenode.tcl
# Link Layer $ll arptable $arptable_ $ll ifq $ifq $ll mac $mac # $ll down-target $ifq; #if NO rlc uncomment it $ll down-target $rlc; #if NO rlc comment this and rest of rlc below # for rlc $rlc up-target $ll $rlc mac $mac $rlc down-target $ifq