NS-2 : using FullTCP over Wireless(DSDV)

ns-2 Full-TCP and Wireless

This is a hack to allow the use of Full-TCP in wireless simulations using DSDV routing. The basic problem is that the IP header is added at the wireless network layer and also accounted for at the Full-TCP transport layer. This code just checks a flag to see if the IP header should be added at the network layer.

To use this, just add Agent/DSDV set fulltcp_ 1 to your TCL script (before you do node-config) once you've made the following changes to the ns source and re-compiled.

Files Changed

dsdv/dsdv.cc

dsdv/dsdv.h

tcl/mobility/dsdv.tcl

Note: These diffs are based on the ns-2.29 release.

dsdv/dsdv.cc

Index: dsdv.cc
*** dsdv.cc     13 Jul 2005 03:51:24 -0000      1.25
--- dsdv.cc     7 Mar 2006 15:26:16 -0000
***************
*** 1009,1015 ****
      /*
       * Add the IP Header
       */
!     cmh->size() += IP_HDR_LEN;    
      iph->ttl_ = IP_DEF_TTL;
    }
    /*
--- 1009,1017 ----
      /*
       * Add the IP Header
       */
!         if (!fulltcp_) {
!                 cmh->size() += IP_HDR_LEN;    
!         }
      iph->ttl_ = IP_DEF_TTL;
    }
    /*
***************
*** 1080,1086 ****
    periodic_callback_ (0), be_random_ (1), 
    use_mac_ (0), verbose_ (1), trace_wst_ (0), lasttup_ (-10), 
    alpha_ (0.875),  wst0_ (6), perup_ (15), 
!   min_update_periods_ (3)     // constants
   {
    table_ = new RoutingTable ();
    helper_ = new DSDV_Helper (this);
--- 1082,1088 ----
    periodic_callback_ (0), be_random_ (1), 
    use_mac_ (0), verbose_ (1), trace_wst_ (0), lasttup_ (-10), 
    alpha_ (0.875),  wst0_ (6), perup_ (15), 
!   min_update_periods_ (3), fulltcp_(0)        // constants
   {
    table_ = new RoutingTable ();
    helper_ = new DSDV_Helper (this);
***************
*** 1095,1100 ****
--- 1097,1104 ----
    bind ("min_update_periods_", &min_update_periods_);
    bind ("verbose_", &verbose_);
    bind ("trace_wst_", &trace_wst_);
+   // MCW  2006Feb02
+   bind ("fulltcp_", &fulltcp_);
    //DEBUG
    address = 0;

dsdv/dsdv.h

Index: dsdv.h
*** dsdv.h      20 Aug 1999 18:03:16 -0000      1.6
--- dsdv.h      7 Mar 2006 15:16:21 -0000
***************
*** 137,142 ****
--- 137,145 ----
    int    min_update_periods_;    // 3 we must hear an update from a neighbor
    // every min_update_periods or we declare
    // them unreachable
+ 
+       // MCW 2006Feb02
+       int fulltcp_;
    
    void output_rte(const char *prefix, rtable_ent *prte, DSDV_Agent *a);

tcl/mobility/dsdv.tcl

Index: dsdv.tcl
*** dsdv.tcl    23 Dec 2003 17:36:35 -0000      1.14
--- dsdv.tcl    7 Mar 2006 15:18:37 -0000
*** 49,54 ****
--- 49,57 ----
  Agent/DSDV set verbose_      0        ;# 
  Agent/DSDV set trace_wst_    0        ;# 
  
+ # MCW  2006Feb02
+ Agent/DSDV set fulltcp_ 0
+ 
  set opt(ragent)               Agent/DSDV
  set opt(pos)          NONE                    ;# Box or NONE

---

Michele C. Weigle
Last modified: Wed Sep 13 02:31:03 UTC+0900 2006

출처 : http://www.cs.odu.edu/~mweigle/research/netsim/fulltcp-wlan.html