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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: Mon, 18 Apr 2016 09:35:43 -0300
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

So, summarizing, that RST was leaking your filter, one that was filtering out all other RSTs sent as response on unused TCP ports:

You                     Your port       lwip
TCP SYN on port x -->        -->          let me see
silence                 block!          <-- RST
TCP SYN on port A -->         -->         let me see
got a response          <--          <-- RST

because your filter in your port blocked x for all x != A, without checking protocol field, just port field.

Did I get it correctly ?
Thx 4 the capture file.

PS: Did my table make it to the list in a readable form ?

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