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

[Yuxin Zhuang <yzhuang@xxxxxxxxxx>]

Hi, Jaap, 

Thanks for your reply!

But the content of Checksum is not 0x0000. The output is as follows:
	Checksum: 0xd87e
		Good Checksum: False
		Bad Checksum: False

I can't figure out whether the checksum is correct or not. Lots of other packets' checksum are not zero either and the result is similar.

Thanks,
Yuxin

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Jaap Keuter
Sent: 2009年2月2日 14:00
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] No indication about UDP checksum

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
> 

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