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Re: [lwip-users] TCP SYN to UDP port

From: Sergio R. Caprile
Subject: Re: [lwip-users] TCP SYN to UDP port
Date: Fri, 15 Apr 2016 10:14:41 -0300
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

TCP SYN to port A returns RST
TCP SYN to port x for every x != A returns nothing.
There is no app listening to TCP port A
There is an app listening to UDP port A

Did I get it properly ?
I don't think that is correct behaviour. AFAIK TCP knows nothing about UDP and viceversa, same port number is just a coincidence; but I'm not an RFC. And UDP ports shouldn't talk TCP anyway...

Can you please post a capture file showing that ?
Can you please double check that TCP port is not used ?

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