[ndnSIM] Question for the course of packet trnamitting

[Alex Afanasyev]

Hi Aaron,

Wire::FromInterest/toInterest do not directly related to the transmission path (these are just to construct actual wire format).

The processing is something like this:

[Consumer/Face] ReceiveInterest(interest) ->
[Face]     (registeredCallback)(Interest)    
            * registered callback is set from Forwarder via RegisterProtocolHandlers method
[ForwardingStrategy] onInterest, ..., PropagateInterest ->
[specific strategy, such as BestRoute] DoPropagateInterest ->
[ForwardingStrategy] TrySendOutInterest ->
[Face] sendInterest ->
[NetDeviceFace] (virtual call) Send ->
...
"actual" transmission through NS'3 NetDevice (NetDevice -> Channel -> NetDevice)
...
[NetDeviceFace] ReceiveFromNetDevice (registered callback to NetDevice) ->
[Face] Receive -> 
[Face] ReceiveInterest ->
[Face]     (registeredCallback)(Interest)    
            * registered callback is set from Forwarder via RegisterProtocolHandlers method
[ForwardingStrategy] onInterest, ..., PropagateInterest ->
...

---
Alex


On May 17, 2014, at 5:00 AM, aaronishere at qq.com wrote:

> Hi, Alex
> 
> I'm confused about how the packet is transmitted in ndnSIM. Take the forwarder as example. When sending the interest, the forwader calls the function [outFace->SendInterest (interest);] in forwardingstrategy.cc, which then calls the funtion [Send (Wire::FromInterest (interest));] in face.cc. However,  [Send (Wire::FromInterest (interest));] seems only to re-construct the packet. I wonder how the packet is sent from the fowarder to another. I feel that there shoud be some functions which call m_fowardingStrategy->Oninterest so that the packet call be sent to the next forwarder, but I did not find it.
> The same question also is for the counsumer and producers. Take the forwarder as example.  When sending the interest, the consumer calls the [m_face->ReceiveInterest (interest);] and then, how the interest is sent to the forwarder?
> 
> Thanks in advance!
>   
> Aaron

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