netdev - Re: [PATCH] Clock-independent TCP ISN generation

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Message-ID: <2cbd5a8f-f120-a7df-83a3-923f33ca0a10@gmail.com>
Date:   Tue, 3 Sep 2019 17:59:20 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cyrus Sh <sirus.shahini@...il.com>, davem@...emloft.net
Cc:     shiraz.saleem@...el.com, jgg@...pe.ca, arnd@...db.de,
        netdev@...r.kernel.org, sirus@...utah.edu
Subject: Re: [PATCH] Clock-independent TCP ISN generation



On 9/3/19 5:39 PM, Cyrus Sh wrote:
> 
> 
> On 9/3/19 1:41 AM, Eric Dumazet wrote:
>> Clock skew seems quite secondary. Some firewall rules should prevent this kind of attacks ?
> 
> Can you provide any reference to somewhere that explains these firewall rules
> and how to exactly use them to prevent this specific type of attack?
> 

You could add a random delay to all SYN packets, if you believe your host has clock skews.