[ns] [Q]ACK sequence number is strange..!

[Kyeongjin Lee <kjlee@datacom.chungnam.ac.kr>]

I simulate wireless mobile environment
MH is move from HA to depart place.
and come again...
I attach tcp at wired node & tcp-sink at MH.
I print sequence number
sequence number of packet(ack) sent by tcpsink.(tcpsink
send npkt = )
sequence number of packet received by tcp.(tcp ---------------------ackno=
)
sequence number of packet send by tcp (tcp-------------------------seqno
= )
sequence number of packet received by tcpsink(tcpsink--------seqno
= )

==========================================
......

tcpsink-------- seqno = 266
tcpsink send npkt =266
 tcp------------------ackno=257
 tcp------------------seqno = 277
tcpsink-------- seqno = 267
tcpsink send npkt =267
tcpsink-------- seqno = 268
tcpsink send npkt =268
tcpsink-------- seqno = 269
tcpsink send npkt =269
 tcp------------------ackno=258
 tcp------------------seqno = 278
 tcp------------------ackno=259
 tcp------------------seqno = 279
 tcp------------------ackno=260
 tcp------------------seqno = 280
 tcp------------------ackno=261
 tcp------------------seqno = 281
tcpsink-------- seqno = 270
tcpsink send npkt =270
tcpsink-------- seqno = 271
tcpsink send npkt =271
tcpsink-------- seqno = 272
tcpsink send npkt =272
 tcp------------------ackno=262
 tcp------------------seqno = 282
tcpsink-------- seqno = 273
tcpsink send npkt =273
 tcp------------------ackno=263
 tcp------------------seqno = 283
tcpsink-------- seqno = 274
tcpsink send npkt =274
 tcp------------------ackno=264
 tcp------------------seqno = 284
tcpsink-------- seqno = 275
tcpsink send npkt =275
 tcp------------------ackno=265
 tcp------------------seqno = 285
 tcp------------------ackno=266
 tcp------------------seqno = 286
 tcp------------------ackno=267
 tcp------------------seqno = 287
tcpsink-------- seqno = 276
tcpsink send npkt =276
tcpsink-------- seqno = 277
tcpsink send npkt =277
 tcp------------------ackno=268
 tcp------------------seqno = 288
 tcp------------------ackno=269
 tcp------------------seqno = 289
 tcp------------------ackno=270
 tcp------------------seqno = 290
-------------------------------------------------------this point MH is not in BS range/sender transmit 1 packet repeatedly
tcp------------------seqno = 271
tcp------------------seqno = 271
tcp------------------seqno = 271
tcp------------------seqno = 271
------------------------------------------------------------------
tcpsink-------- seqno = 288
tcpsink send npkt =277
tcpsink-------- seqno = 289
tcpsink send npkt =277
 tcp------------------ackno=277
 tcp------------------seqno = 278
tcp------------------seqno = 279
 tcp------------------ackno=271--------------------------Maybe MH come in BS range again about this point.

=================================================== I have question at this point why ack number is backward????? Is it possible?
  tcp------------------ackno=277
  tcp------------------ackno=276
  tcp------------------ackno=275
  tcp------------------ackno=274
  tcp------------------ackno=273
  tcp------------------ackno=272
 
 

tcpsink-------- seqno = 290
tcpsink send npkt =277
 tcp------------------ackno=277
 tcpsink-------- seqno = 278
tcpsink send npkt =278
tcpsink-------- seqno = 279
tcpsink send npkt =279
tcpsink-------- seqno = 271
tcpsink send npkt =279
 tcp------------------ackno=277
  tcp------------------ackno=278
 tcp------------------seqno = 280
tcpsink-------- seqno = 271
tcpsink send npkt =279
 tcp------------------ackno=279
 tcp------------------seqno = 281
 tcp------------------ackno=279
 tcpsink-------- seqno = 271
tcpsink send npkt =279
 tcp------------------ackno=279
 tcpsink-------- seqno = 280
tcpsink send npkt =280
tcpsink-------- seqno = 281
tcpsink send npkt =281
 tcp------------------ackno=279
  tcp------------------ackno=280
 tcp------------------seqno = 282
tcp------------------seqno = 283
tcpsink-------- seqno = 271
tcpsink send npkt =281
 tcp------------------ackno=281
 tcp------------------seqno = 284
tcpsink-------- seqno = 282
tcpsink send npkt =282
tcpsink-------- seqno = 283
.........
===============================================