FIELD: information technology.
SUBSTANCE: invention relates to a method of operating a firewall. Accept from the sender with the address for the recipient with the address of the network packet. If the network packet has an encapsulated transport layer protocol number corresponding to the UDP protocol number, and contains data, then the following actions are performed: perform packet filtering for the network packet; determine by means of the control module the fact of using in the data of the protocol the application layer from the set. If the fact of use is established, the following actions are performed: replace the address of the recipient in the network packet with the address of the proxy module in the network address translation module; perform filtering of the network stream in the proxy module; process the data in the proxy module.
EFFECT: technical result is to increase the security of the computer network.
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