| 0 |
0 |
Echo Reply——回显应答（Ping应答） |
x |
|
| 3 |
0 |
Network Unreachable——网络不可达 |
|
x |
| 3 |
1 |
Host Unreachable——主机不可达 |
|
x |
| 3 |
2 |
Protocol Unreachable——协议不可达 |
|
x |
| 3 |
3 |
Port Unreachable——端口不可达 |
|
x |
| 3 |
4 |
Fragmentation needed but no frag. bit set——需要进行分片但设置不分片比特 |
|
x |
| 3 |
5 |
Source routing failed——源站选路失败 |
|
x |
| 3 |
6 |
Destination network unknown——目的网络未知 |
|
x |
| 3 |
7 |
Destination host unknown——目的主机未知 |
|
x |
| 3 |
8 |
Source host isolated (obsolete)——源主机被隔离（作废不用） |
|
x |
| 3 |
9 |
Destination network administratively prohibited——目的网络被强制禁止 |
|
x |
| 3 |
10 |
Destination host administratively prohibited——目的主机被强制禁止 |
|
x |
| 3 |
11 |
Network unreachable for TOS——由于服务类型TOS，网络不可达 |
|
x |
| 3 |
12 |
Host unreachable for TOS——由于服务类型TOS，主机不可达 |
|
x |
| 3 |
13 |
Communication administratively prohibited by filtering——由于过滤，通信被强制禁止 |
|
x |
| 3 |
14 |
Host precedence violation——主机越权 |
|
x |
| 3 |
15 |
Precedence cutoff in effect——优先中止生效 |
|
x |
| 4 |
0 |
Source quench——源端被关闭（基本流控制） |
|
|
| 5 |
0 |
Redirect for network——对网络重定向 |
|
|
| 5 |
1 |
Redirect for host——对主机重定向 |
|
|
| 5 |
2 |
Redirect for TOS and network——对服务类型和网络重定向 |
|
|
| 5 |
3 |
Redirect for TOS and host——对服务类型和主机重定向 |
|
|
| 8 |
0 |
Echo request——回显请求（Ping请求） |
x |
|
| 9 |
0 |
Router advertisement——路由器通告 |
|
|
| 10 |
0 |
Route solicitation——路由器请求 |
|
|
| 11 |
0 |
TTL equals 0 during transit——传输期间生存时间为0 |
|
x |
| 11 |
1 |
TTL equals 0 during reassembly——在数据报组装期间生存时间为0 |
|
x |
| 12 |
0 |
IP header bad (catchall error)——坏的IP首部（包括各种差错） |
|
x |
| 12 |
1 |
Required options missing——缺少必需的选项 |
|
x |
| 13 |
0 |
Timestamp request (obsolete)——时间戳请求（作废不用） |
x |
|
| 14 |
|
Timestamp reply (obsolete)——时间戳应答（作废不用） |
x |
|
| 15 |
0 |
Information request (obsolete)——信息请求（作废不用） |
x |
|
| 16 |
0 |
Information reply (obsolete)——信息应答（作废不用） |
x |
|
| 17 |
0 |
Address mask request——地址掩码请求 |
x |
|
| 18 |
0 |
Address mask reply——地址掩码应答
|