Temporal and spacial variations of quantity of shipworm Teredo navalis in Xiamen Harbour

厦门港船蛆 Teredonavalis数量的时空变化

Teredo is the only one tunnel mechanism designed for NAT users .

目前只有 Teredo 协议 是 专为NAT用户设计的一种 IPv6隧道技术。

Teredo navalis is a type of boring animal that cause damage to underwater wooden structures .

船蛆是一种钻孔动物，危害水下的木质结构。

However Teredo does not support symmetric NAT users and cannot allocate stable IPv6 addresses for the users and also has security problems .

但是， 该 协议不能为用户分配固定的IPv6地址，不支持对称类型的NAT用户，并且不能 有效 防御 源 地址 欺骗 攻击。