[Ndn-interest] The forwarding strategy doesn't choose another path in a hijacker scenario

[David R. Oran]

On 11 May 2019, at 7:52, Lan Wang (lanwang) wrote:

> Best route strategy doesn’t adapt using forwarding plane 
> information.
Quick suggestion:

there’s periodic (and frequent) confusion about what what the best 
route strategy does, so perhaps we should rename it “best route 
only” strategy, or the slightly longer “best route only - no 
ECMP”.

Or even better, fix it to do ECMP so at least we’re not more crippled 
than native IP forwarding.


> It’s purely based on routing ranking.  You can try the ASF strategy 
> but first you need to make sure that R1 has both faces (one to R2 and 
> one to $3) in its FIB entry for the name prefix P is using.
>
> Lan
>
> On May 11, 2019, at 6:41 AM, Farhi Nassima via Ndn-interest 
> <ndn-interest at lists.cs.ucla.edu<mailto:ndn-interest at lists.cs.ucla.edu>> 
> wrote:
>
> Hello everyone,
>
> I tried a hijacker scenario with the topology and the code below, i 
> can see that the hijacker is working fine because the consumer node is 
> sending interests and it doesn't receive anything and the hijacker 
> (R3) is receiving but it doesn't send anything and the interest aren't 
> reaching the producer, but why the best-route forwarding strategy 
> isn't changing the path to a node that is not affected by hijack (R2) 
> ? isn't it what it is supposed to do inherently ? i've tried other 
> strategies (multicast, ncc, ...) but none of them changes the path as 
> well. Can anyone, please tell me how can i do that ? Thank you in 
> advance.
>
>
>                              +=>| R2 |<=+
>                             /   \----/   \
>                            /              \
>                           /                \
>    /---\         /----\<=+                  +=>/----\         /---\
>    | C |<------->| R1 |                        | R4 |<------->| P |
>    \---/         \----/<=+                  +=>\----/         \---/
>                           \                /
>                            \              /
>                             \   /----\   /
>                              +=>| R3 |<=+
>                                 \----/
>
>
> AnnotatedTopologyReader topologyReader("", 6);
>   topologyReader.SetFileName("src/ndnSIM/examples/topologies/topohijack.txt");
>   topologyReader.Read();
>
>
>
>    // Install NDN stack on all nodes
>    ndn::StackHelper ndnHelper;
>    ndnHelper.SetDefaultRoutes (true);
>
>    // Getting containers for the consumer/producer
>    Ptr<Node> producer = Names::Find<Node>("Node5");
>    Ptr<Node> h1 = Names::Find<Node>("Node3");
>    Ptr<Node> consumer=Names::Find<Node>("Node0");
>
>    ndnHelper.InstallAll();
>
>    // Installing global routing interface on all nodes
>    ndn::GlobalRoutingHelper ndnGlobalRoutingHelper;
>    ndnGlobalRoutingHelper.InstallAll();
>
>    // Install NDN applications
>    std::string prefix = "/prefix";
>
>    ndn::StrategyChoiceHelper::InstallAll("/prefix", 
> "ndn:/localhost/nfd/strategy/best-route");
>
>    ndn::AppHelper consumerHelper("ns3::ndn::ConsumerCbr");
>    consumerHelper.SetPrefix(prefix);
>    consumerHelper.SetAttribute("Frequency", StringValue("1")); // 100 
> interests a second
>    consumerHelper.Install(consumer);
>
>    ndn::AppHelper producerHelper("ns3::ndn::Producer");
>    producerHelper.SetPrefix(prefix);
>    producerHelper.Install(producer);
>
>    ndn::AppHelper Hijackers("Hijacker");
>    Hijackers.Install(h1);
>
>    // Add /prefix origins to ndn::GlobalRouter
>    ndnGlobalRoutingHelper.AddOrigins(prefix, producer);
>
>    // Calculate and install FIBs
>    ndn::GlobalRoutingHelper::CalculateRoutes();
>
>    Simulator::Stop(Seconds(30.0));
>    Simulator::Run();
>    Simulator::Destroy();
>
>   return 0;
>
>
>
> Kind Regards.
>
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DaveO