update the folder organisation
This commit is contained in:
Hanzhang ma
parent
6d14b30e89
commit
cab7babbb1
87
Blatt02/ARP.drawio
Normal file
87
Blatt02/ARP.drawio
Normal file
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||||
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87
Blatt02/ARP2.drawio
Normal file
87
Blatt02/ARP2.drawio
Normal file
@ -0,0 +1,87 @@
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||||
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|
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|
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|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-17" value="把标志位Merge_flag设置为False<div>在ARP缓存表中查找发送方协议地址<br>如果存在更新ip-mac表</div><div>把标志位Merge_flag设置为true</div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
|
||||
<mxGeometry x="390" y="210" width="120" height="100" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-26" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" parent="1" source="W-n-PndQ-2xYdpGvvika-18" target="W-n-PndQ-2xYdpGvvika-19" edge="1">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-27" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" parent="1" source="W-n-PndQ-2xYdpGvvika-18" target="W-n-PndQ-2xYdpGvvika-20" edge="1">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-18" value="opcode是ares_op$REQUEST吗？" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
|
||||
<mxGeometry x="770" y="110" width="120" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-19" value="交换硬件和协议部分，把本地硬件和协议地址放到发送区<div>设置ar$op部分为ares_op$REPLY</div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
|
||||
<mxGeometry x="770" y="230" width="120" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-20" value="发送" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
|
||||
<mxGeometry x="960" y="110" width="120" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="W-n-PndQ-2xYdpGvvika-23" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.029;entryY=0.516;entryDx=0;entryDy=0;entryPerimeter=0;" parent="1" source="W-n-PndQ-2xYdpGvvika-14" target="W-n-PndQ-2xYdpGvvika-16" edge="1">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
</root>
|
||||
</mxGraphModel>
|
||||
</diagram>
|
||||
</mxfile>
|
||||
@ -194,3 +194,171 @@ buf :FF FF FF FF FF FF AE AB 32 09 8E B4 08 06 00 01 08 00 06 04 00 01 AE AB 32
|
||||
|
||||
|
||||
|
||||
root@pc1:~# tcpdump -i eth1
|
||||
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
|
||||
listening on eth1, link-type EN10MB (Ethernet), snapshot length 262144 bytes
|
||||
10:53:47.911087 IP6 2001:db8:5::2 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has 2001:db8:5::1, length 32
|
||||
10:53:47.911189 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, neighbor advertisement, tgt is 2001:db8:5::1, length 32
|
||||
10:53:47.912325 IP6 2001:db8:5::2 > 2001:db8:5::1: ICMP6, echo request, id 56760, seq 1, length 64
|
||||
10:53:47.912349 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, echo reply, id 56760, seq 1, length 64
|
||||
10:53:48.904692 IP6 2001:db8:5::2 > 2001:db8:5::1: ICMP6, echo request, id 56760, seq 2, length 64
|
||||
10:53:48.904719 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, echo reply, id 56760, seq 2, length 64
|
||||
10:53:49.906078 IP6 2001:db8:5::2 > 2001:db8:5::1: ICMP6, echo request, id 56760, seq 3, length 64
|
||||
10:53:49.906103 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, echo reply, id 56760, seq 3, length 64
|
||||
10:53:50.907512 IP6 2001:db8:5::2 > 2001:db8:5::1: ICMP6, echo request, id 56760, seq 4, length 64
|
||||
10:53:50.907538 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, echo reply, id 56760, seq 4, length 64
|
||||
10:53:51.908904 IP6 2001:db8:5::2 > 2001:db8:5::1: ICMP6, echo request, id 56760, seq 5, length 64
|
||||
10:53:51.908929 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, echo reply, id 56760, seq 5, length 64
|
||||
10:53:52.926411 IP6 fe80::216:3eff:fe00:2 > 2001:db8:5::2: ICMP6, neighbor solicitation, who has 2001:db8:5::2, length 32
|
||||
10:53:52.927121 IP6 2001:db8:5::2 > fe80::216:3eff:fe00:2: ICMP6, neighbor advertisement, tgt is 2001:db8:5::2, length 24
|
||||
|
||||
|
||||
|
||||
13:14:32.958532 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, neighbor advertisement, tgt is 2001:db8:5::2, length 32
|
||||
0x0000: 0016 3e00 0004 0016 3e00 0602 86dd 6000 ..>.....>.....`.
|
||||
0x0010: 0000 0020 3aff 2001 0db8 0005 0000 0000 ....:...........
|
||||
0x0020: 0000 0000 0001 2001 0db8 0005 0000 0000 ................
|
||||
0x0030: 0000 0000 0002 8800 484c 6000 0000 2001 ........HL`.....
|
||||
0x0040: 0db8 0005 0000 0000 0000 0000 0002 0201 ................
|
||||
0x0050: 0016 3e00 0602 ..>...
|
||||
|
||||
```
|
||||
13:14:32.958532 IP6 2001:db8:5::1 > 2001:db8:5::2: ICMP6, neighbor advertisement, tgt is 2001:db8:5::2, length 32
|
||||
0x0000: 0016 3e00 0004 0016 3e00 0602 86dd 6000 ..>.....>.....`.
|
||||
0x0010: 0000 0020 3aff 2001 0db8 0005 0000 0000 ....:...........
|
||||
0x0020: 0000 0000 0001 2001 0db8 0005 0000 0000 ................
|
||||
0x0030: 0000 0000 0002 8800 484c 6000 0000 2001 ........HL`.....
|
||||
0x0040: 0db8 0005 0000 0000 0000 0000 0002 0201 ................
|
||||
0x0050: 0016 3e00 0602 ..>...
|
||||
```
|
||||
|
||||
00:16:3e:00:00:02
|
||||
|
||||
|
||||
|
||||
这个包是一个 **ICMPv6 邻居通告（Neighbor Advertisement, NA）** 消息，表明发送方（`2001:db8:5::1`）告知接收方（`2001:db8:5::2`），其目标地址（`tgt`）的链路层（MAC）信息。
|
||||
|
||||
以下是对这个包的逐字段详细分析：
|
||||
|
||||
------
|
||||
|
||||
### **1. 数据包的结构**
|
||||
|
||||
ICMPv6 邻居通告消息由以下几部分组成：
|
||||
|
||||
| **字段** | **长度** | **解释** |
|
||||
| ------------------- | -------- | ------------------------------------------------------ |
|
||||
| **以太网帧头** | 14 字节 | 包括源 MAC 地址、目标 MAC 地址和以太网类型。 |
|
||||
| **IPv6 头** | 40 字节 | IPv6 源地址、目的地址，及与数据包相关的信息。 |
|
||||
| **ICMPv6 头** | 4 字节 | 包括类型（Type）、代码（Code）、校验和（Checksum）。 |
|
||||
| **ICMPv6 数据部分** | 可变长度 | 邻居通告消息的具体内容，包括目标地址和链路层地址选项。 |
|
||||
|
||||
------
|
||||
|
||||
### **2. 分析具体字段**
|
||||
|
||||
#### **以太网帧头**
|
||||
|
||||
```
|
||||
0x0000: 0016 3e00 0004 0016 3e00 0602 86dd
|
||||
```
|
||||
|
||||
| 偏移量 | 字段 | 值 | 解释 |
|
||||
| -------- | ------------- | ------------------- | --------------------------------------- |
|
||||
| `0x0000` | 目标 MAC 地址 | `00:16:3e:00:00:04` | 目标设备的链路层地址（目的 MAC 地址）。 |
|
||||
| `0x0006` | 源 MAC 地址 | `00:16:3e:00:06:02` | 源设备的链路层地址（发送方 MAC 地址）。 |
|
||||
| `0x000c` | 以太网类型 | `0x86dd` | 表示接下来的数据是 IPv6 数据包。 |
|
||||
|
||||
------
|
||||
|
||||
#### **IPv6 头部**
|
||||
|
||||
```
|
||||
0x0010: 6000 0000 0020 3aff 2001 0db8 0005 0000
|
||||
0x0020: 0000 0000 0001 2001 0db8 0005 0000 0000
|
||||
0x0030: 0000 0000 0002
|
||||
```
|
||||
|
||||
| 偏移量 | 字段 | 值 | 解释 |
|
||||
| -------- | ---------------- | --------------- | -------------------------------------------- |
|
||||
| `0x0010` | 版本/流量类/流标 | `6000 0000` | IPv6 版本号（6），流量类别（0），流标（0）。 |
|
||||
| `0x0014` | 载荷长度 | `0020` | 载荷长度 32 字节。 |
|
||||
| `0x0016` | 下一头部类型 | `3a` | 表示下一头部为 ICMPv6（58）。 |
|
||||
| `0x0017` | 跳数限制 | `ff` | 初始跳数设置为 255，避免跨链路转发。 |
|
||||
| `0x0018` | 源地址 | `2001:db8:5::1` | 发送方 IPv6 地址。 |
|
||||
| `0x0028` | 目的地址 | `2001:db8:5::2` | 接收方 IPv6 地址。 |
|
||||
|
||||
------
|
||||
|
||||
#### **ICMPv6 头部**
|
||||
|
||||
```
|
||||
0x0030: 8800 484c
|
||||
```
|
||||
|
||||
| 偏移量 | 字段 | 值 | 解释 |
|
||||
| -------- | ------------ | ------ | ------------------------------------------------ |
|
||||
| `0x0030` | 类型（Type） | `88` | 表示这是一个邻居通告（Neighbor Advertisement）。 |
|
||||
| `0x0031` | 代码（Code） | `00` | 固定为 0（邻居通告无子代码）。 |
|
||||
| `0x0032` | 校验和 | `484c` | 校验和，确保 ICMPv6 数据的完整性。 |
|
||||
|
||||
------
|
||||
|
||||
#### **ICMPv6 数据部分**
|
||||
|
||||
```
|
||||
0x0034: 6000 0000 2001 0db8 0005 0000 0000 0000 0002
|
||||
0x0050: 0201 0016 3e00 0602
|
||||
```
|
||||
|
||||
##### **(a) 邻居通告标志和目标地址**
|
||||
|
||||
```
|
||||
0x0034: 6000 0000 2001 0db8 0005 0000 0000 0000 0002
|
||||
```
|
||||
|
||||
| 偏移量 | 字段 | 值 | 解释 |
|
||||
| -------- | -------- | --------------- | ---------------------------------- |
|
||||
| `0x0034` | 目标地址 | `2001:db8:5::2` | 目标设备的 IPv6 地址，告知请求方。 |
|
||||
|
||||
##### **(b) 链路层地址选项**
|
||||
|
||||
```
|
||||
0x0050: 0201 0016 3e00 0602
|
||||
```
|
||||
|
||||
| 偏移量 | 字段 | 值 | 解释 |
|
||||
| -------- | -------- | ------------------- | ---------------------------------------------------- |
|
||||
| `0x0050` | 选项类型 | `02` | 链路层地址选项（Target Link-Layer Address Option）。 |
|
||||
| `0x0051` | 选项长度 | `01` | 长度为 1（单位：8 字节）。 |
|
||||
| `0x0052` | MAC 地址 | `00:16:3e:00:06:02` | 目标设备的链路层地址（MAC 地址）。 |
|
||||
|
||||
------
|
||||
|
||||
### **3. 总结这个包的含义**
|
||||
|
||||
1. **包类型**：
|
||||
- 这是一个 **ICMPv6 邻居通告（NA）** 数据包。
|
||||
2. **发送方信息**：
|
||||
- IPv6 地址：`2001:db8:5::1`。
|
||||
- MAC 地址：`00:16:3e:00:06:02`。
|
||||
3. **接收方信息**：
|
||||
- 目标 IPv6 地址：`2001:db8:5::2`。
|
||||
- 目标链路层地址（MAC）：`00:16:3e:00:04`。
|
||||
4. **作用**：
|
||||
- 通知目标设备（`2001:db8:5::2`），IPv6 地址 `2001:db8:5::1` 解析为 MAC 地址 `00:16:3e:00:06:02`。
|
||||
5. **网络流程**：
|
||||
- 这是对之前邻居请求（NS）消息的回复，目标设备将更新其邻居表，以便后续通信。
|
||||
|
||||
------
|
||||
|
||||
### **补充**
|
||||
|
||||
- **邻居通告的用途**：
|
||||
- 用于响应邻居请求。
|
||||
- 通知链路上的其他设备该地址的链路层信息。
|
||||
- **校验关键点**：
|
||||
- 确认 IPv6 头部和 ICMPv6 数据是否正确匹配。
|
||||
- 确保链路层地址和目标地址一致。
|
||||
|
||||
如果你需要进一步分析或有其他问题，请随时补充！
|
||||
|
||||
Loading…
Reference in New Issue
Block a user