The article considers ensuring a high level of security of modern corporate networks using a distributed firewall based on the Proxmox virtualization platform. The problem of filtering and monitoring traffic of a corporate computer network using containerization is studied. The emphasis is on analyzing the effectiveness of using containerization technology in Proxmox LXC to provide dynamic control of network traffic, increase firewall performance, and flexible adaptation to changes in load. The advantages of using a distributed firewall in Proxmox containers in the context of flexible management of security policies, efficient use of computing resources, and increasing the level of protection of network infrastructure are discussed.