[ns] capture function in 802_11.cc

[dazhi chen]

Dear there,

    In the capture fuction of 802_11.cc, can you guys tell me why we need to

update the NAV value like below?
     
	set_nav(usec(eifs_ + txtime(p)));

(1) why update nav here?
(2) why update the value to eifs_+txtime(p)?


Thanks for your comments.


dazhi chen
Feb. 12