106D-Link DIR-822 User ManualSection 4 - ConfigurationSize of hash: Choose the value for the size of hash.HashingAlgorithm:Specify from drop down list the authentication algorithm for SecondPhase.Enable PFS: Toggle this switch to enable Perfect Forward Secrecy for secondphase.Second phaseDHgroup type:Specify DHgroup type for Second Phase from drop down list.IPsec-SA lifetime: Specify valid value in seconds.Tunneled NetworksAdd: Click to add rule to apply to IPsec tunnel.Delete: Click to delete rule.Local Network: Specify/shows the local subnet of IPsec tunnel.Remote Subnet: Specify/shows the remote subnet of IPsec tunnel.Click Apply when finished.