**To modify your VPN connection options** The following ``modify-vpn-connection-options`` example modifies the local IPv4 CIDR on the customer gateway side of the specified VPN connection. :: aws ec2 modify-vpn-connection-options \ --vpn-connection-id vpn-1122334455aabbccd \ --local-ipv4-network-cidr 10.0.0.0/16 Output:: { "VpnConnections": [ { "CustomerGatewayConfiguration": "...configuration information...", "CustomerGatewayId": "cgw-01234567abcde1234", "Category": "VPN", "State": "modifying", "Type": "ipsec.1", "VpnConnectionId": "vpn-1122334455aabbccd", "TransitGatewayId": "tgw-00112233445566aab", "Options": { "EnableAcceleration": false, "StaticRoutesOnly": true, "LocalIpv4NetworkCidr": "10.0.0.0/16", "RemoteIpv4NetworkCidr": "0.0.0.0/0", "TunnelInsideIpVersion": "ipv4" }, "Routes": [], "Tags": [ { "Key": "Name", "Value": "CanadaVPN" } ], "VgwTelemetry": [ { "AcceptedRouteCount": 0, "LastStatusChange": "2020-07-29T10:35:11.000Z", "OutsideIpAddress": "203.0.113.3", "Status": "DOWN", "StatusMessage": "" }, { "AcceptedRouteCount": 0, "LastStatusChange": "2020-09-02T09:09:33.000Z", "OutsideIpAddress": "203.0.113.5", "Status": "UP", "StatusMessage": "" } ] } ] } For more information, see `Modifying Site-to-Site VPN connection options <https://docs.aws.amazon.com/vpn/latest/s2svpn/modify-vpn-connection-options.html>`__ in the *AWS Site-to-Site VPN User Guide*.