[ndnSIM] Help Needed: Getting Node Name in Forwarder.cpp for Output Logging

[Sirapop Theeranantachai]

Hi Mohammad,

I do not have an easy solution right now. Since the forwarder is in NFD,
it's a bit tricky to access the node name from ns-3::Node.

One way to pass NodeID information is to make ndnSIM (which still has
access to the node name) modify the part where it converts ns-3 packets to
NFD packets
<https://github.com/named-data-ndnSIM/ndnSIM/blob/90d50396654dabad54b6979f2dc8fa929ade544c/model/ndn-net-device-transport.cpp#L127>.
You could add an NDNLPv2
<https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2>tag to the packet
to pass along the node name. You may need to adjust the NFD's face
transport to make it easier to modify the LP.
I have never tried this, but it should work in theory.

I hope someone else has a better solution.


On Mon, Mar 3, 2025, 7:49 AM Mohammad R. Shakournia via ndnSIM <
ndnsim at lists.cs.ucla.edu> wrote:

> Dear ndnSIM community,
>
> I am currently working on measuring CS and PIT lookup times in
> *Forwarder.cpp* by using a clock in the *onIncomingInterest* function. I
> log these measurements to separate output files for each node. However, I
> am facing an issue:
>
>    1. The node names are *not appearing* in my output files.
>    2. When using tracers like *L3Tracer*, multiple faces are assigned to
>    each node, making it difficult to map *faceId* to the corresponding *node
>    name*, even with explicit mapping.
>
> I tried retrieving node names using ns3::Names::FindName(node), but it
> does not always return the expected results. Could you please guide me on
> how to correctly obtain the *node name* in *Forwarder.cpp* and include it
> in my output logs?
>
> Any insights or suggestions would be greatly appreciated.
>
> Best regards,
> Mohammad Reza Shakournia
>
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