The ICMP redirect/change request uses the format shown in Figure . It has an ICMP type code of 5. In addition, it has a code value of 0, 1, 2, or 3.

• ICMP重新导向/改变请求使用的格式显示在图中。它有一个ICMP型态代码5。除外，它有代码值0、1、2或者3。