Re: [ns] send /recv

[Haobo Yu <haoboy@isi.edu>]

for your first question, an agent does not directly call the recv() of
another agents. there's a routing fabric that sends the packets through
nodes/links/etc. towards the destination. please read the ns manual for
detail.

I don't quite understand your second question, but if you want to send
application-level data between agents, you either implement your own agent
header and put them there, or you use the AppData as documented in the ns
manual, the Application sections. 

- Haobo

On Wed, 19 Apr 2000, Sencun Zhu wrote:

> Hi,all:
>    
>      I have several things not very clear about ns
> 1: In ns, there is no actual data transmitting between agents(nodes).What
> happens when one agent wants to send data to another one is the sender
> directly calls the recv method of some agent( is the receiving agent or
> the nearest node downstream to the sender in the route? ), so how can the
> delay or bandwidth of the links be effective?
> 
> 2:  Since the send method just tell should send how many bytes, is it
> meaningful for the receiver to write a complicate procedure to deal
> with the packet just like in the real world?
> Say, in centralized multicast scenario, there are very frequent
> joins/leaving, suppose for the managing center, we need  a very big tree
> and hash table to manage the group, Do we really need to implement the
> tree and the hash table, or how to simulate these things?
> 
> 
> thank you for any suggestion.
> 
> 
> SC 
>   
> 
>