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Date:	Wed, 16 Apr 2014 18:50:46 +0800
From:	zhuyj <>
To:	Stephen Hemminger <>
CC:, "David S. Miller" <>,,,
	"Yang, Zhangle (Eric)" <>,
	"Tao, Yue" <>,
	"Zadoyan, Grant" <>,,,,,
	zhuyj <>
Subject: Re: Should linux send netlink message as it is deleting that routing

On 04/12/2014 02:30 AM, Stephen Hemminger wrote:
> On Fri, 11 Apr 2014 17:15:48 +0800
> zhuyj <> wrote:
>>> With ubuntu 12.04, I run the following to reproduce this defect.
>>> 1) Configure an interface
>>> ifconfig eth1 up
>>> 2) Add routing entry via that interface address
>>> route add -net gw
>>> 3) Change the ip address on that interface as shown below.
>>> ifconfig eth1 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

Thanks a lot.

Best Regards!
Zhu Yanjun

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