ICMPv6报文目的不可达消息

ICMPv6报文目的不可达消息
当IPv6路由设备无法转发或者交付IPv6数据报时，会向源站发送一个ICMPv6目的不可达消息，然后丢弃该数据报。
一、ICMPv6目的不可达消息报文格式

+0-------7-------15---------------31
| Type   | Code  |    Checksum    |
+----------------------------------
|   Identifier   | Sequence Number|
+----------------------------------
|                Data             |
+---------------------------------+

二、ICMPv6目的不可达消息报文格式解释

字段	长度	含义
Type	1字节	消息类型： 128: Echo Request 129: Echo Reply
Code	1字节	消息代码，此处值为0。
Checksum	2字节	用来在ICMPv6报文中检验数据和部分IPv6首部的完整性。
Identifier	4字节	请求与应答报文能够彼此匹配的一个标识，可能是全0。
Sequence Number	4字节	请求与应答报文能够彼此匹配的一个标识，可能是全0。
Data	变长	0或任意数据的8位组。

三、ICMPv6目的不可达消息报文示例

Frame 1: 122 bytes on wire (976 bits), 122 bytes captured (976 bits)
    Arrival Time: Jan  1, 1970 08:00:00.072927000
    Epoch Time: 0.072927000 seconds
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 122 bytes (976 bits)
    Capture Length: 122 bytes (976 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ipv6:icmpv6:data]
    [Coloring Rule Name: ICMP]
    [Coloring Rule String: icmp || icmpv6]
Ethernet II, Src: HuaweiTe_57:28:ca (00:18:82:57:28:ca), Dst:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e)
    Destination:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e)
        Address:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: HuaweiTe_57:28:ca (00:18:82:57:28:ca)
        Address: HuaweiTe_57:28:ca (00:18:82:57:28:ca)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IPv6 (0x86dd)
    Trailer: a15b641f
Internet Protocol Version 6, Src: 2001::1 (2001::1), Dst: 2001::2 (2001::2)
    0110 .... = Version: 6
        [0110 .... = This field makes the filter "ip.version == 6" possible: 6]
    .... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
        .... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
        .... .... ...0 .... .... .... .... .... = ECN-CE: Not set
    .... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
    Payload length: 64
    Next header: ICMPv6 (0x3a)
    Hop limit: 64
    Source: 2001::1 (2001::1)
    [Source Teredo Server IPv4: 0.0.0.0 (0.0.0.0)]
    [Source Teredo Port: 65535]
    [Source Teredo Client IPv4: 255.255.255.254 (255.255.255.254)]
    Destination: 2001::2 (2001::2)
    [Destination Teredo Server IPv4: 0.0.0.0 (0.0.0.0)]
    [Destination Teredo Port: 65535]
    [Destination Teredo Client IPv4: 255.255.255.253 (255.255.255.253)]
Internet Control Message Protocol v6
    Type: Echo (ping) request (128)
    Code: 0
    Checksum: 0xb01b [correct]
    Identifier: 0xabce
    Sequence: 1
    Data (56 bytes)
        Data: 23f432fa000102030405060708090a0b0c0d0e0f10111213...
        [Length: 56]

四、ICMPv6 Echo应答消息报文示例

Frame 1: 122 bytes on wire (976 bits), 122 bytes captured (976 bits)
    Arrival Time: Jan  1, 1970 08:00:00.072982000
    Epoch Time: 0.072982000 seconds
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 122 bytes (976 bits)
    Capture Length: 122 bytes (976 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ipv6:icmpv6:data]
    [Coloring Rule Name: ICMP]
    [Coloring Rule String: icmp || icmpv6]
Ethernet II, Src:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e), Dst: HuaweiTe_57:28:ca (00:18:82:57:28:ca)
    Destination: HuaweiTe_57:28:ca (00:18:82:57:28:ca)
        Address: HuaweiTe_57:28:ca (00:18:82:57:28:ca)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e)
        Address:  Spv_2b:cb:8e (38:c8:5c:2b:cb:8e)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IPv6 (0x86dd)
    Trailer: ac00687c
Internet Protocol Version 6, Src: 2001::2 (2001::2), Dst: 2001::1 (2001::1)
    0110 .... = Version: 6
        [0110 .... = This field makes the filter "ip.version == 6" possible: 6]
    .... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Field: Default (0x00000000)
        .... .... ..0. .... .... .... .... .... = ECN-Capable Transport (ECT): Not set
        .... .... ...0 .... .... .... .... .... = ECN-CE: Not set
    .... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
    Payload length: 64
    Next header: ICMPv6 (0x3a)
    Hop limit: 64
    Source: 2001::2 (2001::2)
    [Source Teredo Server IPv4: 0.0.0.0 (0.0.0.0)]
    [Source Teredo Port: 65535]
    [Source Teredo Client IPv4: 255.255.255.253 (255.255.255.253)]
    Destination: 2001::1 (2001::1)
    [Destination Teredo Server IPv4: 0.0.0.0 (0.0.0.0)]
    [Destination Teredo Port: 65535]
    [Destination Teredo Client IPv4: 255.255.255.254 (255.255.255.254)]
Internet Control Message Protocol v6
    Type: Echo (ping) reply (129)
    Code: 0
    Checksum: 0xaf1b [correct]
    Identifier: 0xabce
    Sequence: 1
    Data (56 bytes)
        Data: 23f432fa000102030405060708090a0b0c0d0e0f10111213...
        [Length: 56]

五、 ICMPv6目的不可达消息协议栈结构
ICMPv6消息封装在IPv6报文中，IPv6首部携带了一个或多个IPv6扩展头，扩展头中的Next Header字段值为58（0x3a）。

ICMPv6报文目的不可达消息

相关文章

发表评论

评论列表（1条）

热门文章

文章分类

最新评论