Nenapsals typ, takže obecně:

Verify Idle/Session Timeout

If the idle timeout is set to 30 minutes (default), it means that it drops the tunnel after 30 minutes of no traffic passes through it. The VPN client gets disconnected after 30 minutes regardless of the setting of idle timeout and encounters the PEER_DELETE-IKE_DELETE_UNSPECIFIED error.

Configure idle timeout and session timeout as none in order to make the tunnel always be up and so that the tunnel is never dropped.

PIX/ASA 7.x and later

Enter the vpn-idle-timeout command in group-policy configuration mode or in username configuration mode in order to configure the user timeout period:

hostname(config)#group-policy DfltGrpPolicy attributes
hostname(config-group-policy)#vpn-idle-timeout none

Configure a maximum amount of time for VPN connections with the vpn-session-timeout command in group-policy configuration mode or in username configuration mode:

hostname(config)#group-policy DfltGrpPolicy attributes
hostname(config-group-policy)#vpn-session-timeout none

Cisco IOS Router

Use the crypto ipsec security-association idle-time command in global configuration mode or crypto map configuration mode in order to configure the IPsec SA idle timer. By default IPsec SA idle timers are disabled.

crypto ipsec security-association idle-time
seconds

Time is in seconds, which the idle timer allows an inactive peer to maintain an SA. Valid values for the seconds argument range from 60 to 86400.