netdev - Re: [Bugme-new] [Bug 35862] New: arp requests from wrong src IP

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Message-id: <201105260400.22814.matare@lih.rwth-aachen.de>
Date:	Thu, 26 May 2011 04:00:22 +0200
From:	Victor Mataré <matare@....rwth-aachen.de>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 35862] New: arp requests from wrong src IP

On Thursday, 26.05.2011 03:52:22 David Miller wrote:
> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Wed, 25 May 2011 16:31:37 -0700
> 
> >> I switched a host's ip address from 137.226.164.13 to 137.226.164.2. The .13 IP
> >> now belongs to the host that had .2 before (I swapped them). Now both hosts
> >> still arp from their old IPs although ifconfig as well as ip clearly tell
> >> otherwise. Examining the host which now has 137.226.164.13:
> >> 
> >> # ip addr show dev eth0
> >> 4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
> >>     link/ether 00:e0:81:41:1f:e4 brd ff:ff:ff:ff:ff:ff
> >>     inet 137.226.164.2/24 brd 137.226.164.255 scope global eth0
> >>     inet 192.168.23.2/24 brd 137.226.164.255 scope global eth0:0
> 
> If you keep the old IP address around it remains as the "primary"
> IP address.
> 
> You have to explicitly remove the original IP address from the
> interface first, then add the new one, in order for the new
> one to become the "primary"
> 
> Not a bug, please close this.
> 

Sorry, there's a typo. It's supposed to read:

[...]
Examining the host which now has 137.226.164.2 (used to have 137.226.164.13):

# ip addr show dev eth0
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
     link/ether 00:e0:81:41:1f:e4 brd ff:ff:ff:ff:ff:ff
     inet 137.226.164.2/24 brd 137.226.164.255 scope global eth0
     inet 192.168.23.2/24 brd 137.226.164.255 scope global eth0:0
[...]

Sorry, got confused with all the swapping. I'm *not* keeping the old address around, it's completely *gone*, from both ifconfig and ip. But still it's being used as arp src address. That's what this bug is about. Sorry for the confusion.
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