Applying more than NAT on one node

[tuba.ce...@gmail.com]

Hi All,
 I have a scenario where I have to apply more than one NAT(Do not ask. A part of my playing around :D).
I am using static NAT like below
Ptr<Ipv4Nat> nat = natHelper.Install (pgw1);
        nat->SetInside (1);
        nat->SetOutside (2);
        Ipv4StaticNatRule rule0 (Ipv4Address ("7.0.0.3"), 49153, Ipv4Address ("1.0.0.1"), 3005, 0);
        nat->AddStaticRule (rule0);

I am using this is a loop. After completion of this one iteration, I need to reset or delete  whatever I did in above part. This is needed to make sure that in the next iteration, another NAT is applied on the same node. The reason I am trying this way is it does not allow more than one NAT on one particular node

Cheers!

[Tommaso Pecorella]

Hi,

we don't have your code, we don't have the module you're using, and honestly i can't understand the question (if there's a question).

Mind reading the posting guidelines ?

Thanks,

T.

[tuba.ce...@gmail.com]

Sorry Tommasso about the less details about the questions


Topology:
   RH---------------Node1-----------------------{ Network1}
                               |
                               |
                               |
                    {Network2}

I need to apply NAT on Node1, for IPs coming from Network1. This is followed by applying a NAT on Node1 again, but for IPs comings from Network2 this time. I can apply NAT on Node1 either for Network1 or Network2. Not both at same time. If I try to apply to both Network on same Node1, I get below error
"Object::AggregateObject(): Multiple aggregation of objects of type ns3::Ipv4Nat".
The error happens as NAT is applied on same node 2 times.


Below is the code for NAT on Node1 from Network1
Ptr<Ipv4Nat> nat = natHelper.Install (Node1);

        nat->SetInside (1);
        nat->SetOutside (2);
        Ipv4StaticNatRule rule0 (Ipv4Address ("7.0.0.3"), 49153, Ipv4Address ("1.0.0.1"), 3005, 0);
        nat->AddStaticRule (rule0);

For Network2
Below is the code for NAT on Node1 from Network2
Ptr<Ipv4Nat> nat1 = natHelper.Install (Node1);
        nat1->SetInside (1);
        nat1->SetOutside (2);
        Ipv4StaticNatRule rule1 (Ipv4Address ("8.0.0.3"), 49153, Ipv4Address ("1.0.0.1"), 3006, 0);
        nat->AddStaticRule (rule1);

My question: Is there any way to reset or delete, the operation performed on Node1 for Network1, before I do it for network2.? I mean remove Nat, so that Nat1 will be the only on Node1 with NAT while applying.

Cheers,
T

[tuba.ce...@gmail.com]

I understand that the  object(NAT object) can be aggregated  to Node1 only once . I am just wondering if there is any way of reversing the aggregation?

[Craig Dowell]

Use two nodes each with one NAT (seems to be closer to what would really happen with multiple NAT) or aggregate an object to one node that forwards to multiple NAT objects?

On Nov 10, 2016, at 11:11 AM, tuba.ce...@gmail.com wrote:

I understand that the  object(NAT object) can be aggregated  to Node1 only once . I am just wondering if there is any way of reversing the aggregation?

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[Konstantinos]

Hi Tuba,

I haven't used NAT and I do not have access to that code to verify it either.

However, your approach looks a bit bizzar to me. 

Wouldn't it be easier to simple add another rule to your NAT? 

There should be only one instance of the NAT. 

If there is no RemoveStaticRule available, then you can create it. Perhaps the developer did not foreseen such process.

Regards

K.

[tuba.ce...@gmail.com]

Hello Konstantios,
      It works fine with RemoveStaticRule. Adding a new rule did not serve my purpose, as static NAT takes the last added rule(ie rule with 0 index)
Thanks a lot.