netdev - Re: Should linux send netlink message as it is deleting that routing entry?

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Message-ID: <534E6086.9020103@gmail.com>
Date:	Wed, 16 Apr 2014 18:50:46 +0800
From:	zhuyj <zyjzyj2000@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	ebiederm@...ssion.com, ja@....bg,
	"Yang, Zhangle (Eric)" <Zhangle.Yang@...driver.com>,
	"Tao, Yue" <Yue.Tao@...driver.com>,
	"Zadoyan, Grant" <Grant.Zadoyan@...driver.com>,
	eric.dumazet@...il.com, socketcan@...tkopp.net,
	hannes@...essinduktion.org, cwang@...pensource.com,
	zhuyj <zyjzyj2000@...il.com>
Subject: Re: Should linux send netlink message as it is deleting that routing
 entry?

On 04/12/2014 02:30 AM, Stephen Hemminger wrote:
> On Fri, 11 Apr 2014 17:15:48 +0800
> zhuyj <zyjzyj2000@...il.com> wrote:
>
>>> With ubuntu 12.04, I run the following to reproduce this defect.
>>>
>>> 1) Configure an interface
>>> ifconfig eth1 150.0.0.1/24 up
>>>
>>> 2) Add routing entry via that interface address
>>> route add -net 200.0.0.0/24 gw 150.0.0.1
>>>
>>> 3) Change the ip address on that interface as shown below.
>>> ifconfig eth1 151.0.0.1/24 up
>>>
>>> 4) Check netlink messages with "ip monitor all". There is no route
>>> delete netlink message.
>>>
> With IPv4 there are several cases where there is a non-notified
> implicit route withdrawal. This is not something that can be fixed.
> There are two issues:
>   1. with large backbone size route tables (ie 1M routes), the number
>      of notification messages becomes a bottleneck and would be unreliable
>   2. the existing routing daemons (quagga, bird, etc) all understand/expect
>      the existing semantics
>
Hi,

Thanks a lot.

Best Regards!
Zhu Yanjun

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