Wireshark · Wireshark-users: Re: [Wireshark-users] No indication about UDP checksum

[Jaap Keuter <jaap.keuter@xxxxxxxxx>]

Hi,

In UDP the checksum is optional. So if it's set to 0x0000 that means it's not 
calculated by the sender and cannot be checked by the receiver.
For Wireshark that results in "Checksum: 0x0000 (none)" and it can't be neither 
good or bad, since there's is no checksum.

Thanx,
Jaap

Yuxin Zhuang wrote:
> Hi,
>  
> While i'm analyzing some captured pkts, i notice that lots of UDP pkts 
> have no indication on 'checksum' and both good and bad checksum are 
> 'false'. What does this mean?
>  
> The output is as follows:
>  
>  
> Thanks a lot!
> Yuxin