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Date:	Tue, 13 Mar 2012 11:26:36 -0300
From:	Diego Woitasen <diego@...tasen.com.ar>
To:	David Miller <davem@...emloft.net>
Cc:	billfink@...dspring.com, shemminger@...tta.com,
	netdev@...r.kernel.org
Subject: Re: ip route show shows the routes in the inverse order?

On Tue, Mar 13, 2012 at 3:52 AM, David Miller <davem@...emloft.net> wrote:
> From: Bill Fink <billfink@...dspring.com>
> Date: Tue, 13 Mar 2012 02:15:29 -0400
>
>> Some scripts may depend on this plus its much more efficent that way
>> if trying to find a matching route since you can quit on the first
>> match instead of having to scan the entire routing table.
>
> No script should be doing stuff like this, let the tool do it for you
> via "ip route get ADDR"
>
> There is absolutely no argument for routes to be listed in one order
> or another, and anything depending upon order is extremely fragile
> and needs to be fixed up anyways.

I don't aggree at this point. First, it was the behavior for years,
like a "de facto" standard. Second, there a "natural ordering"  for
routes. More specific match first, so it makes sense for them to be in
the first place.

>
> If you're trying to match something, do a real lookup, a longest
> prefix match lookup.  It's the only thing that's going to be correct
> all the time, no matter what.



-- 
Diego Woitasen
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