Hi,

On Wed, Feb 24, 2021 at 06:01:19PM +0000, tincanteksup wrote:
> today I discovered that a server using TCP responds to an initial Syn 
> packet with an ack packet, even with --tls-auth key configured.
> 
> I presume this is expected and cannot be avoided when using TCP due to 
> initial IP requirements ?

This is the kernel's doing.

All TCP based services (by necessity) do this.

gert

-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             g...@greenie.muc.de

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