**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*.