[ndnSIM] ndnSIM: Modifying Interest Packet

[Muhammad Hosain Abdollahi Sabet]

Alex,

I can make a copy of Interest and modify it. How can I get it
Forwarder::startProcessInterest to make it pass forwarding pipeline again?
I mean, what about the incoming face? Any suggestion?

Thanks,
Sabet



On Thu, Aug 18, 2016 at 12:15 PM, Muhammad Hosain Abdollahi Sabet <
mhasabet at gmail.com> wrote:

> Alex,
>
> How about setDelegation for LINKS? In ndnSIM 2.1 Interest packet is
> modified(using setSelectedDelegation) under circumstances and a LOGIC log
> is generated. How is that happening? buffe::reset()(which I couldn't find
> it in doxygen) copies an interest and replace it with the first one?
>
> Thanks,
> Sabet
>
> خندان باشید
> با تشکر
>
> On Fri, Aug 12, 2016 at 9:15 PM, Alex Afanasyev <aa at cs.ucla.edu> wrote:
>
>> Hi Pratyush,
>>
>> You're correct.  I would only restate is a little bit more general and
>> say that NS3's Packet data structure cannot be modified by the routers.
>> What you can do is to make a copy of the packet and modify the copy.
>>
>> I think the same applies to the tags with some exceptions that I cannot
>> remember right now.
>>
>> --
>> Alex
>>
>> > On Aug 12, 2016, at 8:32 AM, Pratyush Agnihotri <
>> pratyushagnihotri03 at gmail.com> wrote:
>> >
>> > Hi Alex,
>> >
>> > I am trying to modify Interest packet for my custom forwarding strategy
>> in ndnSIM 1.0. I observed that once the Interest packet (header + payload)
>> is serialized to the network, it cannot be modified by intermediate nodes
>> (e.g., in the forwarding strategy). The packet is only deserialized by
>> relay (or intermediate) nodes and cannot be written (or modified) by them.
>> I checked the source file ndnSIM/model/wire/ndnsim.cc, Serialize() and
>> Deserialize() functions for the same.
>> >
>> > Is my understanding correct? Or, is there some way to write to buffer
>> while the packet is in network?
>> >
>> > For e.g., FwHopCountTag is the by given as example how to add
>> information in payload. If one want to increment the hop count and re-write
>> to payload as follows:-
>> >
>> > FwHopCountTag hopCount;
>> >       bool tagExists = packet->RemovePacketTag (hopCount);
>> >
>> >       if (tagExists)
>> >       {
>> >           hopCount.Increment ();
>> >               packet->AddPacketTag (hopCount);
>> >         }
>> >
>> > This tries to increment the hopCount, but it doesn't actually increment
>> if I print the value. This means even though I re-write to the payload, it
>> doesn't update the packet.
>> >
>> > Please let me know.
>> >
>> > --
>> > Kind Regards,
>> > Pratyush Agnihotri
>> > _______________________________________________
>> > ndnSIM mailing list
>> > ndnSIM at lists.cs.ucla.edu
>> > http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>>
>>
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>
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