Will a VPN Connection Be Reestablished After Its Configuration Is Modified?

A VPN connection consists of local subnets, remote subnets, remote gateway, pre-shared key, IKE negotiation policies, and IPsec negotiation policies. A VPN connection is modified if any of the following happens:

• If the local and remote subnets are modified, the connection ID will remain unchanged. If not all subnets are updated, the established tunnel between subnets will not be re-established.
• If the IP address of the remote gateway is changed, even the connection ID will remain unchanged, the remote end has changed. Therefore, the VPN connection needs to be reestablished.
• If only the pre-shared keys of the connection are changed, the connection ID and status will remain unchanged. The keys will be checked again during renegotiation. If the keys do not match, the renegotiation fails.
• If the negotiation policy is modified (pre-shared key authentication is required), the connection ID will be changed and the connection needs to be re-established.