netdev - Re: [PATCH net-next-2.6] ipv4: sysctl to block responding on down interface

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Message-ID: <OFA9AE9CDE.69224382-ONC1257750.007F44EA-C1257750.0081210A@transmode.se>
Date:	Tue, 29 Jun 2010 01:30:26 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	shemminger@...tta.com
Subject: Re: [PATCH net-next-2.6] ipv4: sysctl to block responding on down interface

David Miller <davem@...emloft.net> wrote on 2010/06/28 23:57:44:
>
> From: Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
> Date: Mon, 28 Jun 2010 23:09:02 +0200
>
> > To me it "ifconfig eth0 down" means not only to stop using the I/F
> > but also any IP address associated with the I/F.
>
> IP addresses are associated with the host, not a particular interface.
>
> Therefore the state of the interface should not influence the behavior
> of the IP address.
>
> If you want the IP address to stop being responded to, delete the IP
> address.

This is an strict interpretation of the weak host model and does not
answer my questions. Mind to elaborate why such a strict view and
what is gained by answering on an IP address which has been "downed"?
What types of apps use this property?

 Jocke

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