Under　Distributed　Denial　of　Service(DDoS)　attacks,　it　is　very　difficult　to　provide　legitimate　users　with　their　fair　share　of　available　network　resource.　This　paper　proposes　source　traffic　aggregation　scheme　based　TTL　as　a　traffic　metering　and　control　scheme　that　can　provide　quick　weakness　of　DDoS　attack　while　protecting　legitimate　user　s　traffic.　The　key　idea　of　this　scheme　is　to　provide　good　quality　of　service(QoS)　to　sources　that　use　the　network　resource　properly　and　poor　QoS　to　sources　that　use　network　resource　so　excessively　as　to　result　in　network　congestion.