[ns] Questions regarding AODV codes in ns-allinone-2.1b7

[Wang Qiang <engp0442@nus.edu.sg>]

Dear ns users:

I just want to raise some doubt regarding the following sections of AODV
codes in ns-allinone2.1b7 package.

1. ~ns2/aodv/aodv.cc:  
	In the beginning of the file, Line 50:
        #define max(a,b)	a > b ? a : b
   	I think this line should be modified as:
	  #define max(a,b)	(a > b ? a : b)
	Because WITHOUT the brackets, the code in recvRequest() at Line 873:
	  seqno = max((unsigned)seqno, (unsigned)rq->rq_dst_seqno) + 1;
	is actually interpret as:
	  seqno = max((unsigned)seqno, (unsigned)rq->rq_dst_seqno + 1);
	which is rather misleading.

2. ~ns2/rttable.h:
	In definition of class rttable, Line 183:
		LIST_HEAD(ncache, rt_entry) rthead;
	I think using nchache here as the struct name is rather bad practice
because
	it has already been used as the global struct name for Neighbor
cache, Line 80:
		LIST_HEAD(ncache, Neighbor);
	The two do not conflict but are misleading.  I suggest some other
name be used in
	Line 183, such as:
		LIST_HEAD(rtt, rt_entry) rthead;

Your comments are welcomed. Thank you.