netdev - Re: [PATCH net-next v5] net: ipv6: Make address flushing on ifdown optional

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Message-Id: <20151014.060007.594576048227764026.davem@davemloft.net>
Date:	Wed, 14 Oct 2015 06:00:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	nicolas.dichtel@...nd.com, dsa@...ulusnetworks.com,
	netdev@...r.kernel.org, hannes@...hat.com
Subject: Re: [PATCH net-next v5] net: ipv6: Make address flushing on ifdown
 optional

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Wed, 14 Oct 2015 14:14:05 +0200

> I can bring up the rp_filter setting, too. It currently gets
> unconditional set to strict mode in systemd on all interfaces.

Sigh...

> The question is, if we should care about people enabling forwarding by
> simply toggling the sysctl forwarding knob? Essentially in the kernel we
> could provide two sysctl knobs, one for forwarding and one for local
> reception. So people following the guidelines how to enable forwarding
> could automatically have rp_filter enabled while host mode does not
> because we leave  the forwarding rp_filter setting enabled. This at the
> same time seems unnecessary complex and maybe we should simply talk to
> distributions. ;)
> 
> What do you think?

We could make rp_filter only apply when something more than default and
subnet routes are configured.  Another bypass might be when only one
interface other than loopback is up and enabled for ipv4.

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