From: Hannes Frederic Sowa <hannes@stressinduktion•org>
To: Stas Sergeev <stsp@list•ru>
Cc: netdev <netdev@vger•kernel.org>,
Sowmini Varadhan <sowmini.varadhan@oracle•com>
Subject: Re: Q: bad routing table cache entries
Date: Tue, 12 Jan 2016 18:47:19 +0100 [thread overview]
Message-ID: <56953C27.4030405@stressinduktion.org> (raw)
In-Reply-To: <569538FD.2060200@list.ru>
On 12.01.2016 18:33, Stas Sergeev wrote:
> 12.01.2016 20:26, Hannes Frederic Sowa пишет:
>> On 12.01.2016 18:18, Stas Sergeev wrote:
>>> 12.01.2016 20:06, Hannes Frederic Sowa пишет:
>>>> On 12.01.2016 17:56, Stas Sergeev wrote:
>>>>> 12.01.2016 19:42, Stas Sergeev пишет:
>>>>> Also the rfc1620 you pointed, seems to be saying this:
>>>>>
>>>>> A Redirect message SHOULD be silently discarded if the
>>>>> new router address it specifies is not on the same
>>>>> connected (sub-) net through which the Redirect arrived,
>>>>> or if the source of the Redirect is not the current
>>>>> first-hop router for the specified destination.
>>>>>
>>>>> It seems, this is exactly the rule we were trying to find
>>>>> during the thread. And it seems violated, either. Unless I am
>>>>> mis-interpreting it, of course.
>>>>
>>>> If you read on you will read that with shared_media this exact clause (the first of those) is not in effect any more.
>>> OK. But how to get such a redirect to work, if (checked with
>>> tcpdump) the packets do not even go to eth0, but to "lo"?
>>
>> I don't know, the router must be on the same shared medium. I guess physical reconfiguration is required?
> It is same.
> Router 192.168.8.1 has just one ethernet port.
> And even on the 192.168.10.202 node I can do:
> # arp -a |grep "0.1"
> ? (192.168.0.1) at 14:d6:4d:1c:97:3d [ether] on eth0
> So even 0.1 is about to be reachable.
> Still nothing works.
> Should it work if 192.168.0.1 router, to which 8.1 redirects,
> has shared_media disabled?
Can you check with tcpdump? ping requires the router to also find a
correct way back, so packet can get stuck at a lot of places. Also uRPF
is maybe active which kind of defeats shared_media and please check
netfilter.
Bye,
Hannes
next prev parent reply other threads:[~2016-01-12 17:47 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-29 10:54 Q: bad routing table cache entries Stas Sergeev
2015-12-29 11:58 ` Sowmini Varadhan
2015-12-29 12:06 ` Stas Sergeev
2015-12-29 12:32 ` Sowmini Varadhan
2015-12-29 12:43 ` Stas Sergeev
2015-12-29 13:19 ` Stas Sergeev
2015-12-29 15:22 ` Sowmini Varadhan
2015-12-29 15:38 ` Stas Sergeev
2015-12-29 17:40 ` Stas Sergeev
2015-12-30 12:42 ` Stas Sergeev
2015-12-30 14:17 ` Eric Dumazet
2015-12-30 17:56 ` David Miller
2016-01-04 1:05 ` Sowmini Varadhan
2016-01-04 1:32 ` Stas Sergeev
2016-01-04 17:23 ` Stas Sergeev
2016-01-12 14:40 ` Stas Sergeev
2016-01-12 14:47 ` Sowmini Varadhan
2016-01-12 20:33 ` David Miller
2016-01-12 15:34 ` Hannes Frederic Sowa
2016-01-12 15:52 ` Hannes Frederic Sowa
2016-01-12 16:03 ` Stas Sergeev
2016-01-12 16:10 ` Hannes Frederic Sowa
2016-01-12 16:42 ` Stas Sergeev
2016-01-12 16:56 ` Stas Sergeev
2016-01-12 17:06 ` Hannes Frederic Sowa
2016-01-12 17:18 ` Stas Sergeev
2016-01-12 17:26 ` Hannes Frederic Sowa
2016-01-12 17:33 ` Stas Sergeev
2016-01-12 17:47 ` Hannes Frederic Sowa [this message]
2016-01-12 20:43 ` Stas Sergeev
2016-01-12 22:26 ` Hannes Frederic Sowa
2016-01-12 22:57 ` Stas Sergeev
2016-01-12 23:07 ` Hannes Frederic Sowa
2016-01-13 12:59 ` Stas Sergeev
2016-01-12 17:41 ` Stas Sergeev
2016-01-12 15:57 ` Stas Sergeev
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