String cidrSubnet = NetUtils.getCidrSubNet(cidr);
int cidrSize = (int)NetUtils.getCidrSize(NetUtils.cidr2Netmask(cidr));
routerPort.networkAddress(cidrSubnet);
routerPort.networkLength(cidrSize);
routerPort.portAddress(network.getGateway());
// If this is a VPC, then we will be using NetworkACLs, which is
// implemented via chains on the router port to that network.
if (getIsVpc(network)) {
// Create ACL filter chain for traffic coming INTO the network