使用一系列固定格式的扩展头部取代了IPV 4中可变长度的选项字段。

Using a series of fixed format extension head replaced IPV4 variable-length options in the fields.

youdao

指明了如何解析可变长度字段，有效值被描述在表1。

Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.

youdao

指明了如何解析可变长度字段，有效值被描述在表1。

Indicates how to interpret the variable length type field. Valid values are described in described in Table 1.

youdao