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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH]: Add Network Sysrq Support
Date: Tue, 21 Jun 2011 15:58:16 -0700 (PDT)
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From: Florian Westphal <fw@strlen.de>
Date: Wed, 22 Jun 2011 00:56:45 +0200

> Flavio Leitner <fbl@redhat.com> wrote:
>> What about a whitelist of source MAC or IP addresses to accept the sysrq?
> 
> This is one of the reasons why I still think that
> xt_SYSREQ would be the better solution, you get all
> kinds of filtering features for free.
> 
> You could even use crazy things like '-m time' to restrict
> sysreq availability to working hours and whatnot.

Agreed.