Re: [ns] the direction field in packet header hdr_cmn

[Yan Yu <yanyu@catarina.usc.edu>]

HI, thanks for your hint. I found the direction field is overwritten to
NONE, why?? 
also, does the NetworkInterface is used by any network layer protocol?

Thanks a LOT,
yan

On Mon, 19 Jun 2000, Tarik Alj wrote:

> The network interface (above LL) is responsibke for reseting the direction 
> field:
> 
> netif.cc
> 
> >Date: Mon, 19 Jun 2000 12:50:57 -0700 (PDT)
> >From: Yan Yu <yanyu@catarina.usc.edu>
> >To: ns-users <ns-users@isi.edu>
> >Subject: [ns] the direction field in packet header hdr_cmn
> >MIME-Version: 1.0
> >
> >HI, there, 
> >  by looking up the mac layer code, (like mac.cc, mac-802_3.cc, or
> >bi-connector.cc), it seems that the MAC layer judge if it is sending or
> >receiving the packet( i.e., if the packet is traveling up or down the
> >stack) by looking up the direction field in packet header. but from my
> >simulation, it seems like the the direction filed is not set up
> >properly. I am using Mac-802_3 as MAC layer, LLSnoop as link layer..
> >I am wondering who is responsible for setting up the direction field in
> >hdr_cmn? which layer??
> >
> >I guess, say, if it travels up the stack( receving a packet, physical
> >layer is responsible for setting it as UP. and as it travels down, the
> >higher layer, e.g., application layer, or network layer is reposbile for
> >setting it up as DOWN??
> >
> >any feedback on this is very appreciated!!
> >yan
> 
> Tarik 
>