1. Zhang, G.-F.: The solution and management of VPN based IPSec technology. Int. J. Technol. Manag. 6, 124–128 (2014)
2. Zhang, G., Li, W.: A security reinforcement scheme for the server. In: 2018 4th International Conference on Education, Management and Information Technology (ICEMIT 2018), vol. 14, pp. 92–96 (2018)
3. WOP in education social sciences and psychology, July 2018
4. Alboba, B., Dixon, W.: IPsec-network address translation (NAT) compatibility requirements. RFC3715 (2004)
5. Zhang, G.-F.: A rapid switching technology of IP data packet based on multi-protocol. Int. J. Technol. Manag. 7, 142–147 (2014)