Re: DSDV in ns-2.1b5

[Satish Kumar <kkumar@ISI.EDU>]

I havent used dsdv and so I dont know what exactly the problem might be. Abt 
addressing, the default in ns is 16 bit addrs with the last 8 bits being the 
port number. So when you see iph->src_ = 255, it actually means node 0 with 
port 255 (which is the ROUTER_PORT for dsdv). So node 1 would be 511 and so 
on. BTW, if you have more than 128 nodes in your scenario, you need to expand 
the address space (using set-address-format expanded; see Chapter 14 in ns 
Doc). Hope this is of some help.

Satish


> On Thu, 8 Jul 1999, Satish Kumar wrote:
> 
> > 
> > You might want to check if the AgentTrace, RouterTrace or MacTrace Tcl 
> > variables are set to ON in the wireless.tcl example file.
> 
> Thanks, Satish
> But, I had set to ON for all Traces in the wireless.tcl file. 
> Therefore, I don't think that is the reason for my problem.
> 
> One thing I suspect is that a routing table would have wrong information.
> I tried to make a printout elements of a routing table and 
> I found that some garbage values were stored in the routing table. 
> For example, a next hop field (rte.hop) is set by 255.
> 
> Have you looked at the 'dsdv.cc' file?  
> In the 'makeUpdate()' function on that file, there is a statement:
> 
>           :
>   rte.dst = myaddr_;
>   rte.hop = iph->src_;    <--- Is this correct ?? 
>   rte.metric = 0;              (It is 255 initially and seems to be      
>           :                     increased by 256 - (into 511, 767...)
>  
> 
> - Youngbae
> 
> 
> 
> > > Hello.
> > > 
> > > I need some help from whoever have tested on dsdv routing 
> > > implementation (CMU's extensions) in the current version of ns-2.
> > > 
> > > I have tried to execute ns-2 for cbr traffics with a DSDV 
> > > routing agent ( tcl/mobility/dsdv.tcl and dsdv/dsdv.cc files ). 
> > > I have used my own scenario and connection files.
> > > I really suspect that this DSDV version works properly.
> > > 
> > > 1) Nothing is in a output trace file (out.tr), except for movement 
> > >    of nodes (M). Looks no data packets go through the network.
> > > 
> > > 2) some bugs at functions to handle routing table update ??
> > > 
> > > It is surprising if the DSDV does not work because CMU folks
> > > reported a simulation result using DSDV routing agent in their paper.
> > > Anyone who have experienced similar problems with dsdv, 
> > > please answer for me. 
> > > 
> > > regards,
> > > - Youngbae
> > > 
> > > /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
> > >      Young-Bae Ko    {youngbae@cs.tamu.edu}
> > > 
> > >      http://www.cs.tamu.edu/people/youngbae
> > >      Dept. of Computer Science   [Tel] 409-845-5007 
> > >      Texas A&M University        [Fax] 409-847-8578
> > > /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
> > > 
> > 
> > 
> > 
> 
> 
> /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
>      Young-Bae Ko    {youngbae@cs.tamu.edu}
> 
>      http://www.cs.tamu.edu/people/youngbae
>      Dept. of Computer Science   [Tel] 409-845-5007 
>      Texas A&M University        [Fax] 409-847-8578
> /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
>