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Date:	Sun, 18 Jan 2015 22:08:15 -0800
From:	Francesco Ruggeri <>
To:	Julian Anastasov <>
Cc:	Francesco Ruggeri <>,
	David Miller <>,
	netdev <>,
Subject: Re: Regression from "ipv4: Cache ip_error() routes even when not forwarding."

On Sat, Jan 17, 2015 at 8:30 AM, Francesco Ruggeri <> wrote:
> On Sat, Jan 17, 2015 at 12:25 AM, Julian Anastasov <> wrote:
>>         Hello,
>> On Fri, 16 Jan 2015, Francesco Ruggeri wrote:
>>> Commit 251da413("ipv4: Cache ip_error() routes even when not forwarding."),
>>> later slightly modified by cd0f0b95("ipv4: distinguish EHOSTUNREACH from
>>> the ENETUNREACH"), introduced a regression where an ip_error route is cached
>>> when an ARP request is received on a non-forwarding non matching interface,
>>> and it affects later legitimate packets for the same destination even if
>>> coming over different interfaces.
>>> Attached are two scripts that show the problem. The first one does basic
>>> forwarding, and the second one does proxy arp.
>>> In both cases a dummy interface is created for the sole purpose of receiving
>>> an ARP request that results in the ip_error route to be cached. The offending
>>> ARP request is generated by using a 'ping -c 1' (commented out in the scripts).
>>> Verified in 3.16 build.
>>         3.16? Just in case, can you check if this
>> fix from 3.18 helps:
> Thanks, I will.

Thanks Julian, the commit you pointed me to did fix my problem.


> Francesco
>> commit fa19c2b050ab5254326f5fc07096dd3c6a8d5d58
>> Author: Nicolas Cavallari <>
>> Date:   Thu Oct 30 10:09:53 2014 +0100
>>     ipv4: Do not cache routing failures due to disabled forwarding.
>> Regards
>> --
>> Julian Anastasov <>
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