[Discuss] port-knocking

[Rich Pieri]

--On Wednesday, March 27, 2013 8:59 PM -0400 Tom Metro 
<tmetro+blu at gmail.com> wrote:

> Not merely workarounds...it's trivial to design a port knocking scheme
> that is resistant to DoS attacks.

Perhaps, but it isn't as easy to implement such a system such that use is 
transparent to users. That's not me saying that security is a tradeoff with 
usability. That's me saying that you're using the wrong tool.


> Of course any public facing server is subject to DoS attacks if the
> sender can overwhelm your inbound bandwidth.

That's orthogonal to the point: your port knocking "security" wall and my 
IP spoofing can subject you to DoS attacks with a handful of packets unless 
you implement workarounds for the lockout. If you have to work around a 
basic function of the security system just to make it usable then you're 
using the wrong tool for the job.

But I repeat myself.

-- 
Rich P.