Figure 3-18 ICMP Time Exceeded Message Frame 1: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) Arrival Time: Feb 25, 2014 02:30:55.060937000 Epoch Time: 1393266655.060937000 seconds [Time delta from previous captured frame: 0.000000000 seconds] [Time delta from previous displayed...
缺省情况下,ICMP Time Exceeded报文以标准形式携带扩展头,原始报文长度可变。 在接口视图下配置ICMP属性来优化IP性能。 执行命令interfaceinterface-type interface-number,进入接口视图。 (可选)对于以太网接口,执行命令undo portswitch,配置接口切换到三层模式。
最后,你需要测试规则以确保“time exceeded”类型的ICMP包已被禁用。这可以通过发送一个超时的ICMP数据包(例如,通过ping一个不存在的IP地址并观察响应)并检查防火墙日志或网络流量来完成。 如果规则配置正确,你应该不会看到任何“time exceeded”类型的ICMP响应,并且防火墙日志(如果启用了日志记录)也不会显示此类包的通...
8.4 ICMP Query/Informational Messages 虽然ICMP 定义了一系列的查询消息,例如 Address Mask Request/Reply,Timestamp Request/Reply,和 Information Request/Reply,这些功能已经被其他更加目的特化的协议 (包括 DHCP 协议,见第 6 章) 代替了。仅存的流行的 ICMP query/informational 消息是 Echo Request/Response 消息,...
message back to the source host. This error can indicate a routing loop or the fact that the sender’s initial hop limit is too low. It can also tell you that someone used thetracerouteutility, which is described later in the chapter.Figure 4-4shows the format of the Time Exceeded ...
11 0 Time to Live exceeded in Transit 传输过程中超过生存时间 11 1 Fragment Reassembly Time Exceeded 分片重组超时 12 0 Pointer indicates the error 参数问题,错误由指针指出 12 1 Missing a Required Option 缺少必需的选项 12 2 Bad Length 长度错误 2.4 ICMPv4差错报文限制 在某些情况下,网络...
11 – Time Exceeded 0 TTL expired in transit Error 1 Fragment reassembly time exceeded Error 12 – Parameter Problem 0 Pointer indicates the error Error 1 Missing a required option Error 2 Bad length Error 13 – Timestamp 0 Timestamp
Type: /** Error Messages: (type <128) */ #define ICMP6_DST_UNREACH 1 #define ICMP6_PACKET_TOO_BIG 2 #define ICMP6_TIME_EXCEEDED 3 #define ICMP6_PARAM_PROB 4 /** Informational Messages (type>=128) */ #define ICMP6_ECHO_REQUEST 128 #define ICMP6_ECHO_REPLY 129 ...
MessagesReceived MessagesSent ParameterProblemsReceived ParameterProblemsSent RedirectsReceived RedirectsSent SourceQuenchesReceived SourceQuenchesSent TimeExceededMessagesReceived TimeExceededMessagesSent TimestampRepliesReceived TimestampRepliesSent TimestampRequestsReceived ...
time exceeded 0 timestamp reply 0 Mping request 0 Mping reply 0 Sent packets: echo 0 destination unreachable 0 source quench 0 redirects 0 echo reply 8 parameter problem 0 timestamp request 0 information reply 0 mask requests 0 mask replies 0 time exceeded 0 timestamp reply 0 Mping request ...