# Research on SWIM Services Dynamic Migration Method +
## 5 Experimental Results and Analysis
### Model Performance Analysis  
Through the above analysis, the method has a high degree of invulnerability. According to the SWIM official manual, the validity of the model is verified from both throughput and delay [9].  
The simulated SC subscribes to the aeronautical information service. The SWIM network throughput test results are shown in Figure 13. In the first 50 min, both networks maintain good throughput. At 50 min, the network is maliciously attacked and the SWIM network resources were occupied. As a result, the SWIM throughput is declining. Since the method can avoid attacks and tolerate disasters, the SWIM network throughput of deploying this method is significantly slower than that of SWIM networks without the method, and it has higher damage resistance.  
In the process of SWIM providing services, the average service delay is an important indicator to describe the performance of SWIM services. We want to reduce the delay as much as possible, but by deploying migration security measures in SWIM, it will increase the work of the system. The network security attack and defense process are a trade-off process. We simulated 500 SCs to obtain aeronautical information services through SWIM, and statistics the average service delay. The average service delay of SWIM is shown in Figure 14. In a secure environment, both can guarantee a lower service delay. In an abnormal network environment, the original SWIM network fails to evade the attack. The SC obtains the connection timeout return information, and the average network service delay will increase. The SWIM network deploying the method can still maintain a good state.  
Figure 12: Performance analysis of the SWIM service dynamic migration method.  
The SWIM network performance of the SSM model is compared with the SWIM network performance indicators of the SSM model. The performance comparison results are shown in Table 3. As can be seen from Table 3, under normal circumstances, SSM can guarantee the continuity of SWIM services, and its throughput and service delay can meet the performance requirements of SWIM; In an abnormal environment, the performance of SSM is significantly better than that of SWIM networks without SSM models deployed.  
Network security attack and defense itself is a game process that weighs the pros and cons. The SWIM service dynamic migration method is based on the security sacrifice of SWIM service performance in the security environment in exchange for the security and stability of SWIM service performance under abnormal network environment. Effectively improve the damage resistance of SWIM, increase the attack difficulty of malicious attackers, and improve the survivability of SWIM services.  
Figure 14: Average service delay comparison.  
Figure 13: Throughput performance comparison.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Model**} & \multicolumn{2}{c}{**Average Throughput (bytes/s)**} & \multicolumn{2}{c}{**Average Service Delay (ms)**} \\ \cline{2-5}  & **Normal Situation** & **Abnormal Situation** & **Normal Situation** & **Abnormal Situation** \\ \hline With SSM & 483.4 & 343.1 & 127 & 155 \\ Without SSM & 497.1 & 241.1 & 112 & 207 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Performance comparison between the two models.