[ns] Dropping packets in the queue

Hello, I am changing link layer, implemented in ~ns/mac/ll.{h, cc}, to give support for header compression. It occurs a strange thing as I change the code to drop packets that doesn't have any context saved in the node. Instead of dropping just the packet passed by parameter into the link layer,

[ns] Node id_

Hello, I'd like to know if there is some way of find out in which node I am being within link layer, for example. Thanks in advance, Laércio Jr.