linux-kernel - Re: ifconfig changing a routing table?

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Message-ID: <20070901163335.GB13190@kallisti.us>
Date:	Sat, 1 Sep 2007 12:33:35 -0400
From:	Ross Vandegrift <ross@...listi.us>
To:	Dan Stromberg <dstromberglists@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ifconfig changing a routing table?

On Fri, Aug 31, 2007 at 03:55:53AM +0000, Dan Stromberg wrote:
> Is anyone on the list familiar with ifconfig up and/or ip link up 
> changing a routing table?  How does the kernel decide what route to add 
> in such a circumstance?

By the parameteres you supplied for the interface configuration.

So, if you're getting a connected route for 10.3.0.0/16 out of dev
eth0, it's because you assigned some IP in that subnet to that device,
with a netmask of 255.255.0.0

Check that your netmask is correct.


-- 
Ross Vandegrift
ross@...listi.us

"The good Christian should beware of mathematicians, and all those who
make empty prophecies. The danger already exists that the mathematicians
have made a covenant with the devil to darken the spirit and to confine
man in the bonds of Hell."
	--St. Augustine, De Genesi ad Litteram, Book II, xviii, 37
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