Re: dev Digest, Vol 169, Issue 7

Hello Stefan;
I don't know how to help, but I am excited to see the finished product! Good luck. 

Michael Hubbard


> On Apr 6, 2019, at 12:00, [email protected] wrote:
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> Today's Topics:
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>   1. Questions about custom IP/UDP/RPC packets (ste0640)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 5 Apr 2019 20:36:13 +0000
> From: ste0640 <[email protected]>
> To: "[email protected]" <[email protected]>
> Subject: Questions about custom IP/UDP/RPC packets
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi everyone,
> 
> 
> 
> I hope I am not at the wrong place here for questions.
> 
> 
> 
> I tried to write a script to discover profinet devices on an ip address and get information about them. Mostly to test the knowledge I gathered about this topic in an internship and maybe make it useable for others too.
> 
> I am new to lua and the nmap libs but they seemed suitable for this task.
> 
> 
> 
> So I used a hex string for my packet and tried to send first with bind, connect and send, after that with ip_open and ip_send. Both times the packet which I captured with Wireshark had no checksum although I calculated it and put it in the right place.
> 
> Does somebody know what I have done wrong? Or did I understand the documentation in the wrong way?
> 
> 
> 
> Thanks in advance if somebody can help me there. Even if it's only a link for further studies.
> 
> 
> 
> Regards,
> 
> Stefan
> 
> 
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