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Mobile IPv6 cannot achieve seamless handoff for both UDP communications such as voice over IP (VoIP) and TCP communications such as FTP, since bursty packet loss during handoff degrades their transmission quality. In order to present completely bursty packet loss during handoff, we proposed an extended version of hierarchical mobile IPv6, HMIPv6 with buffering (HMIP-Bv6). In this paper, we present the packet transmission quality of HMIP-Bv6 through theoretical and experimental evaluations. The results elucidate that our proposal is more than enough to enable seamless handoff for both UDP and TCP communications.