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Date:	Thu, 1 Jul 2010 13:48:06 +0200
From:	Joakim Tjernlund <>
To:	Andi Kleen <>
Cc:	David Miller <>,,
	Stephen Hemminger <>
Subject: Re: [PATCH net-next-2.6] ipv4: sysctl to block responding on down interface

Andi Kleen <> wrote on 2010/07/01 13:23:21:
> Joakim Tjernlund <> writes:
> > 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.
> Doesn't arpfilter enable this already? If you set in on the still up
> interfaces those will not answer to other IP addresses.
> This only works on the ARP level, so it has to wait until the arp
> cache in the remote host times out.

I tried that but it didn't work, but I didn't think of clearing
the ARP cache.
Anyhow, such methods seems worse than just doing ifconfig


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