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Re: [ns] multiple links between 2 nodes
> On Mon, 17 Dec 2001, Gustavo Chafla wrote:
> >> can we have more than one link between two nodes?
>
> >no, not in ns.
>
> >--Padma
>
> If you attach an TCP agent and UDP agent to node 1,
> and attach TCP sink agent and UDP NUll agent to node 2,
> then connect these 2 agents respectively, wouldn't
> it be considered as 2 link between these 2 nodes?
>
> -susan
You can attach multiple agents in a node and then connect them with another
node. In this case you have multiple "flows" sharing the same link
bandwidth.
My problem is that I need al least two virtual communication paths between
nodes, one for signalling traffic with an specific bandwidth and, when
necessary, a user data channel with different bandwidth.
More specifically, I have a satellite topology with several clients nodes,
one node acting as a transparent satellite and one node as a Network Control
Centre (NCC). All the nodes has to establish a signalling communication
channel between them and the NCC. I create a star topology, it mean, the
nodes send data to the satellite node (who does not introduce any packet
delay) and then it forwards to the NCC and vice versa. When the nodes detect
user traffic, addressed to another client, they ask to the NCC for the
necessary bandwidth. It is very easy to change the ns link bandwidth but
this change also affects the bandwidth of the signalling channel (there is
only one link between the node and transparent satellite) that has to be
static.
I am not using the ns satellite implementation due to my model need to use
RSVP and other characteristics that have not been considered in such model.
I use simplex links with delay of 125 ms (one satellite hop) between client
nodes to satellite and satellite to nodes or NCC.
Probably there is a way to change the RTT of specific packets but I am new
in ns programming.
Thanks in advance for any kind of help,
Gustavo.