From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?G=E1sp=E1r_Lajos?= <swifty@freemail.hu>
Subject: Re: redundancy with Adsl modem
Date: Wed, 04 Jan 2012 10:09:12 +0100
Message-ID: <4F041738.9090908@freemail.hu>
References: <CAMTjHrw92RRMe4Y2cGfVsS6eBrvL-=1pYCueOC7vOW=RT_-=7g@mail.gmail.com> <1325574854.2270.130.camel@andybev-desktop> <CAMTjHrxMUCb1b4tKeQon9QuJCxp3YunwJ7BiPfBtCokGFLYkWg@mail.gmail.com> <op.v7jefiizx1lyi3@debiandesk2.net>
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To: Lloyd Standish <lloyd@crnatural.net>
Cc: Andrew Beverley <andy@andybev.com>, =?ISO-8859-1?Q?Usu=E1rio_do_S?= =?ISO-8859-1?Q?istema?= <maiconlp@ig.com.br>, Mail List - Netfilter <netfilter@vger.kernel.org>

Hi all!!

I have made some time ago an iface match that can check the state of an 
interface...
Maybe you can use it. (It is in the xtables-addons)

Swifty.