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Hello all,
I am a very beginner user of NS. At
my first views, NS seemed to me to be the tool I was looking for since some
time ago. Now my hopes came down. I have to meet IP-multicast and IP-diffserv.
Both can be tested in NS in a very simple way. However I don�t now how to put
them toghether. I mean, I have to create a network
topology where one can find IP traffic, IP-multicast (both in a best-effort
mode), unicast-diffserv and multicast-diffserv. I have to test the
interaction among them in the point of view of resources allocation, use of it
and its sharing consequences.
When I test only diffserv in NS, all goes
ok. The same happen when I test multicast. But when one adds, in a ns-diffserv
example, the instructions needed to have multicast traffic, the last doesn't
work. The needed replicators aren't automatically created in all nodes and the
variable dst-addr/port is (always?) instatiated as -1/-1. This value change
if one connects, previously, the communicating agents; but, of course, it
isn't multicast. So, supposing that I am testing diffserv in NS, if I want to
have simultaneously multicast how should I manage to get:
- replicators in all nodes (created automatically or not)
with its tables in good order?
- affect code points in order to aggregate diffserv and
multicast-diffserv in a separated way?
- separate queues, at each link, as needed for
each specific flow or aggregation of it?
Can anybody help? Anyway, many tanks in
advance for your attention. Sorry for taking some of your time.
Best regard,
JS
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