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Date:	Mon, 28 Jun 2010 14:28:29 -0700
From:	Mitchell Erblich <>
To:	Joakim Tjernlund <>
Cc:	Eric Dumazet <>,
	David Miller <>,,
	Stephen Hemminger <>
Subject: Re: [PATCH net-next-2.6] ipv4: sysctl to block responding on down interface

On Jun 28, 2010, at 2:09 PM, Joakim Tjernlund wrote:

> Eric Dumazet <> wrote on 2010/06/28 21:42:01:
>> Le lundi 28 juin 2010 à 21:03 +0200, Joakim Tjernlund a écrit :
>>> Stephen Hemminger <> wrote on 2010/06/11 17:48:54:
>>>> When Linux is used as a router, it is undesirable for the kernel to process
>>>> incoming packets when the address assigned to the interface is down.
>>>> The initial problem report was for a management application that used ICMP
>>>> to check link availability.
>>>> The default is disabled to maintain compatibility with previous behavior.
>>>> This is not recommended for server systems because it makes fail over more
>>>> difficult, and does not account for configurations where multiple interfaces
>>>> have the same IP address.
>>>> Signed-off-by: Stephen Hemminger <>
>>> Ping David et. all?
>>> I too want this.
>> You probably missed David reply
> Sure did, don't know how that happened, sorry.
> Reading David's reply I do wonder about the current behaviour. Why
> is it so important to keep responding to an IP address when the
> admin has put the interface holding that IP address into administratively
> down state? I don't think the weak host model stipulates that it must be so, does it?
> 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. I was rather surprised that
> it didn't work that way. I don't see any way to make Linux stop responding to
> that IP other that removing it completely from the system, which is rather
> awkward.
> Note, I don't mean that the same should be applied for the No Carrier case, just
> ifconfig down.
> Jocke
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Hey guys, isn't the support of magic pkts/ Energy star require the receipt
of pkts while the intf is down?

Mitchell Erblich--
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