# LSSDNF: A Lightweight Secure Software Defined Network Framework for Future Internet in 5G-6G
## 3 Proposed Approach
Therefore, we only need to isolate that one malicious node from the network

Figure 1: Single-controller SDN Test Network. Figure 2: Multi-controller SDN Test Network. and avoid performing security checks on the entire network. Here, an attacker tries to provide bogus information to the controller in order to change the routing information. Routing attacks change how packets are routed on SDN by manipulating routing control information [21]. As a result, multi-controller nodes employing multichain can detect a malicious node and an intrusion attempt to change the routing information. ### Simulation Metrics

A description of the test parameters used is provided below:

* **Bandwidth**
* **Throughput**
* **Latency (Delay)**
* **Jitter**

Figure 4: Transaction cost. Figure 3: Smart contract deployment. Any network's performance is determined by the bandwidth and the protocols being utilized. After adjusting some basic variables, including the number of devices in the network, the bandwidth, and the amount of time, the network was tested. The iPerf network tool is used to identify the network characteristics for two distinct types of networks. The aforementioned parameters are applied with the following constraints:

* **Time:** A brief test period of 180 s for each of the three networks was sufficient to produce the desired findings. * **Bandwidth:** For all three networks, the bandwidth used to extract the TCP and UDP network packet characteristics was set to a constant value of 26 Mbps and 2 Mbps, respectively. * **No of Devices:** The controller in topology one was the only network device modified. In the first type of architecture, the single-controller topology, we only need a single SDN controller. Specifically, we use three SDN controllers in a master-slave configuration for the multi-controller SDN topology. ### Experimental Results

Traditional TCP Network vs. SDN TCP Network

We evaluated both networks for 180 s while restricting the bandwidth to 25 Mbps and only using TCP protocol packets. Below is a graph of the network properties. Figures 5 and 6 make it very evident that SDN offers more bandwidth stability than traditional networks. Figure 7 clearly shows that throughput nearly stays constant for a constant bandwidth in an SDN network. In contrast, there is so much fluctuation in a traditional network that the transfer rate occasionally drops to zero and stays there for a while. We also noticed that SDN could transfer more data than the conventional network for the same period. ### Traditional UDP Network vs. SDN UDP Network

Both networks are evaluated for 180 s while restricting the bandwidth to 1.05 Mbps and solely using UDP protocol packets. The characteristics of the network are depicted in Figures 8-11. Figure 6: SDN TCP Bandwidth Fluctuation. Figure 7: Transfer Rate/Throughput of TCP SDN vs. Traditional Network. We fixed the bandwidth for the aforementioned tests, but how the network uses the bandwidth is up to it. With SDN, the bandwidth remains constant. SDN, i.e., supplies or provides us with a stable network. However, the traditional network's bandwidth fluctuates significantly, demonstrating that conventional networks are not stable. The throughput is shown in the above figure, and as we can see, it is constant for the entire testing period for SDN, but it abruptly drops to zero at 182 s. In contrast, we can see that for Traditional Network, the throughput fluctuates and is not even close to being a constant value. We can also see that it still transfers data after 182 s, i.e., it continues to transfer data even after the testing period has ended. This is concrete evidence that SDN is significantly faster than traditional networks. Figure 8: UDP Bandwidth Fluctuation of SDN vs. Traditional Network. Figure 9: Transfer Rate/Throughput of SDN vs. Traditional Network. According to our testing, the average jitter for SDN networks is 0.112 Mbps, which is a meager value. In contrast, the average jitter for Traditional networks was found to be much higher than the corresponding SDN networks.