PortValue: uint32(0),
						},
					},
				}
				extraSrcAddrs = append(extraSrcAddrs, extraSrcAddr)
			}
			localCluster.cluster.UpstreamBindConfig.ExtraSourceAddresses = extraSrcAddrs
		}
	}
	return localCluster
}

// buildInboundPassthroughCluster builds passthrough cluster for inbound.
func (cb *ClusterBuilder) buildInboundPassthroughCluster() *cluster.Cluster {