http://140.116.72.80/~smallko/ns2/mflood.htm

相关代码如下：
in tcl/lib/ns-mobilenode.tcl

2.26
>
line 249 to 255

249        set dmux_ [$self demux]
250        set classifier_ [$self entry]
251
252        if { [Simulator set RouterTrace_] == "ON" } {
253                #
254                # Send Target
255                #

>******************

2.27

line 249 to 258

249        set dmux_ [$self demux]
250        set classifier_ [$self entry]
251
252        # let the routing agent know about the port dmux
253        $agent port-dmux $dmux_
254
255        if { [Simulator set RouterTrace_] == "ON" } {
256                #
257                # Send Target
258                #
>*******************

In line 253, it accesses "port-dmux".

This causes the Mflood protocol faiulre in 2.27, becaues it access a
non-existing function called port-dmux on the Agent object.