Re: active networking in ns

[Alberto Cerpa <cerpa@isi.edu>]

On Thu, 14 Oct 1999, Guillermo Rodriguez Garcia wrote:

> 
> >> I have been studying this for a while in the past days, and there
> >> are only two things about it:
> >>
> >> - Although they intended to release this package as a 'generic'
> >> extension to ns, in fact it is very focused towards AER, their
> >> own active protocol; or at least towards active protocols for
> >> multicasting.
> >
> >The basic Active Network Package is designed to allow multicasting
> >in active networks so there is some additional overhead in that respect.
> 
> Yes; I guess waht I will have to do at the end is just use
> your AN extension package but I will remove everything related
> to mcast to keep it as simple as I can.
> 
> >> - Also, this solution involves a modified classifier.cc, which
> >> I would like to avoid unless I'm forced to use it (same reason
> >> as above).
> >
> >I don't think there is any way around this without modifying classifier.
> Since
> >all packets released by an agent in a node pass back through that node's
> entry
> >point, for active networking the entry point must be modified.   If a
> packet is
> >an active packet that has not been seen by the active agent at that node, it
> >should be forwarded to the active agent.  If a packet is an active packet
> that
> >has been seen by that node's active agent, it should be forwarded to the next
> >hop.  We added two fields to packets and modified classifier.cc to allow the
> >entry point to make that decision.
> 
> Someone suggested here to attach the agent to the queue, instead of
> attaching it to the node. It looked like a good idea, but I am just
> realizing now that this approach would need a much higher number of
> agents (two per link instead of one per node), which wouldn't be a
> good thing for a large scale simulation :-(
> 
> So I'm afraid that you are right and I cannot avoid having a modified
> classifier.cc.
>

I wonder how the people that have incorporated RSVP into ns-2 have solved
the hop-by-hop interception problem? It may be a gook place to look for
ideas ...

Alberto.

 
> BTW, are you still working with active networks ? I have been
> studying you ants-based AER protocol and there are two or
> three questions that I would like to ask you, if you have the
> time.
> 
> Thanks for your reply !
> 
> Regards,
> G.
> --
> Guillermo Rodriguez Garcia
> <guille@iies.es>
> 
> --
> Guillermo Rodriguez Garcia
> <guille@iies.es>
>