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Date: Tue, 22 Jun 2010 10:15:37 -0700 (PDT) From: David Miller <davem@...emloft.net> To: shemminger@...tta.com Cc: joakim.tjernlund@...nsmode.se, netdev@...r.kernel.org Subject: Re: [PATCH net-next-2.6] ipv4: sysctl to block responding on down interface From: Stephen Hemminger <shemminger@...tta.com> Date: Fri, 11 Jun 2010 08:48:54 -0700 > The initial problem report was for a management application that used ICMP > to check link availability. That application is buggy, and even if we apply this patch it will only properly function when speaking to systems in a non-default configuration. And, it would be a non-default setting which, by your own admission below, cannot function properly in valid interface configurations. It's easier to fix the app to work in all cases than to add another sysctl knob hack for a segment of the world that can't seem to wrap their head around the fact that our behavior is valid, specified, and an explicit design decision meant to increase the chances of successful communication between two systems. > 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. The fact that the syctl knob, when enabled, can't even function properly in this "multiple interfaces with same address" case is another reason I have decided to not apply this. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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