what is wrong with iface_?

[Gang Xu <gxu@eng.ua.edu>]

Hi, Chetan,

I tried to read the iface_ from the 'common' header of a packet using
	hdr_cmn* cmnh = (hdr_cmn *) p->access(off_cmn_);
and
	cmnh->iface();
However, no matter for which node, I always get -2 for the iface_. After I
pass it to 'ifaceGetNode', it only returns -1.

I don't think it is correct. I will try them on some other machines in
case my NS has some problems. I just want to know whether there is any
other format to visit the 'common' header of the packet?

Thanks, 
Gang



On Thu, 9 Jul 1998, Chetan Rai wrote:

> 
> 
> On Thu, 9 Jul 1998, George Riley wrote:
> 
> > I believe you can look in the ip_hdr of the packet, and check the
> > ip_hdr->src() value, which indicates the node inthe upper 24 bits.
> > George
> 
> I think Gang wants to find the neighbouring node thru which the packet
> was routed - the Node instproc 'ifaceGetNode' returns this node - the
> incoming interface (required as argument to ifaceGetNode) is in the
> iface_ data member of the cmn header.
> 
> -Chetan
> 
> > 
> > 					
> > 			-George F. Riley (riley@cc.gatech.edu)
> > 		 	-Grad Student Liaison
> > 
> > 
> > On Thu, 9 Jul 1998, Gang Xu wrote:
> > 
> > > Hi,
> > > 
> > > After a node receives a packet, is it possible to check which neighbor
> > > sends the packet to it? 
> > > 
> > > Gang Xu
> > > ------------------------------------------------------------------
> > > Department of CS                        Tel: (205)348-0996(O)
> > > University of Alabama, Tuscaloosa       http://www.eng.ua.edu/~gxu
> > > 
> > > 
> > > 
> > 
> > 
> 
> 

Gang Xu
------------------------------------------------------------------
Department of CS                        Tel: (205)348-0996(O)
University of Alabama, Tuscaloosa       http://www.eng.ua.edu/~gxu