passthrough := cb.buildInboundPassthroughCluster()
			ips := sets.New[string]()
			ips.Insert(passthrough.GetUpstreamBindConfig().GetSourceAddress().Address)
			for _, extra := range passthrough.GetUpstreamBindConfig().GetExtraSourceAddresses() {
				ips.Insert(extra.GetAddress().GetAddress())
			}
			want := sets.New[string]()
			if tt.ipv4Expected {