Modern methods and means of building a service of virtual private networks are considered, the ways of their realization with the help of hardware and software on the example of a private virtual network based on CISCO FlexVPN are analyzed. To implement this task, the key exchange protocol was used to ensure the security of interaction in IKEv2 virtual networks. It is noteworthy that FlexVPN in IOS by default requires minimal action from the system administrator to quickly configure the VPN. The so-called smart-defaults are intended for this (standard ikev2 proposal / policy / profile, ipsec profile and others are configured in advance). In such a configuration, the following are configured by default: IKEv2 proposal, IKEv2 policy, IPSec transform-set, and IPSec profile. Moreover, they are configured so that the most serious algorithms have the highest priority, which, as a rule, suits the system administrator. Naturally, the greatest predictability of VPN operation will be provided by manual setting of all parameters. In view of the above, it can be stated that the FlexVPN technology is the most progressive for building VPN channels, as it has a wide scale, flexibility, does not i
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