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Date: Sun, 6 Jan 2002 22:36:51 +0100
From: Martin Schewe <m@xsms.de>
To: linux-kernel@vger.kernel.org
Subject: Re: In kernel routing table vs. /sbin/ip vs. /sbin/route
Message-ID: <20020106223651.B31958@linux01.gwdg.de>
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Hi,

On Sun, Jan 06, 2002 at 12:23:50PM -0800, Dave Zarzycki wrote:
> Using /sbin/route, I can add multiple default routes like so:
>
> /sbin/route add -net default gw 192.168.0.1
> /sbin/route add -net default gw 192.168.0.2
>
> But I cannot do the same with /sbin/ip:
>
> /sbin/ip route add default via 192.168.0.1
> /sbin/ip route add default via 192.168.0.2
> RTNETLINK answers: File exists

$ /sbin/ip route append default via 192.168.0.2

> Given that /sbin/ip is the more powerful and modern tool, I'm lead to
> believe that /sbin/route might be leaving the in kernel routing table
> in a weird state.
>
> My two simple questions are as follows:
>
> 1) Which tool is more correct?

RFC1122 says having several _default_ routes is okay.

> 2) What is the behavior of the kernel when multiple default routes are
> defined?

The kernel will make dead gateway detection to select the right one for
you.

Regards,
		Martin

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