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                            [TOC]


## IP UDP TCP  關系
![](https://img.kancloud.cn/fa/7f/fa7febcdc66b95b3ecc8f71e45da1f02_960x464.png)

## IP報文
![](https://img.kancloud.cn/5b/95/5b958ee72a185f03135afce19906b174_1978x1164.png)

## UDP 報文
![](https://img.kancloud.cn/ee/31/ee3183f672d851f44aefdc6b53d1eb77_1132x452.png)

## TCP 的報文
![](https://img.kancloud.cn/67/87/678786472d246a108b0f741bfc6109f9_1562x654.png)

## 總結
ip 報文長度為20 
udp 報文長度為16
tcp 報文長度為20
```
假設報文為 pack

ip+udp的報文:
    ip = pack[:20]
    udp = pack[20:20+8]

ip+tcp的報文長度:
    ip = pack[:20]
    udp = pack[20:20+20]
```

可以查看 python解析報文的示例

[python解析IP/TCP/UDP 報文](../../python/%E5%86%85%E7%BD%AE%E5%8C%85/struct%E5%A4%A7-%E5%B0%8F%E7%AB%AF%E5%BA%8F.md)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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