public String getIpAddress() {
        return this.ipAddress;
    }
<p>
IPv4 address for the customer gateway device's outside interface. The address must be static. If
<code>OutsideIpAddressType</code> in your VPN connection options is set to <code>PrivateIpv4</code>, you can use
an RFC6598 or RFC1918 private IPv4 address. If <code>OutsideIpAddressType</code> is set to
<code>PublicIpv4</code>, you can use a public IPv4 address.
</p>

@return IPv4 address for the customer gateway device's outside interface. The address must be static. If
        <code>OutsideIpAddressType</code> in your VPN connection options is set to <code>PrivateIpv4</code>, you
        can use an RFC6598 or RFC1918 private IPv4 address. If <code>OutsideIpAddressType</code> is set to
        <code>PublicIpv4</code>, you can use a public IPv4 address.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/CreateCustomerGatewayRequest.java