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Re: Incorrect arp reply when bonding and 3rd interface are on same LAN.

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On 15.04.2016 11:33, Mimiko wrote:
> Hello.
>
> A server has 3 interfaces: eth0, eth1, eth2. I've setup a bond12 with
> mode adaptive-alb with eth1 and eth2. Now interfaces have:
>
> auto eth0
> iface eth0 inet static
> address x.x.x.1
> netmask 255.255.255.0
>
> auto eth1
> iface eth1 inet manual
>
> auto eth2
> iface eth2 inet manual
>
> auto bond12
> iface bond12 inet static
> address x.x.x.2
> netmask 255.255.255.0
> bond-slaves eth1 eth2
> bond-mode balance-alb
>
> All interfaces are connected to 3 different switches which are on same
> LAN (switches are interconnected).
>
> The problem is that when I do from another computer:
>
> arping -c 1 -I eth0 x.x.x.1
>
> or
>
> arping -c 1 -I eth0 x.x.x.2
>
> in both cases I receive two mac addresses: one for eth0 and another for
> currently active interface in the bond. This confuses clients and there
> are problem when accessing servicing on incorrect interface regarding
> the IP.
>
> mac for x.x.x.1 must be of the eth0
> mac for x.x.x.2 must be of the currently active interface in the bond
>
> What could be the problem?
>
> Also on start-up, bond0 is also created with no slaves. Why it is created?
>
> Thank you.

I've just found the problem. I read this site:

http://kb.linuxvirtualserver.org/wiki/Using_arp_announce/arp_ignore_to_disable_ARP

And use:

echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore


This resolves the problem. On windows by default is not to reply with 
the mac of the not received interface.

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Thread

Incorrect arp reply when bonding and 3rd interface are on same LAN. Mimiko <vbvbrj@gmail.com> - 2016-04-15 10:40 +0200
  Re: Incorrect arp reply when bonding and 3rd interface are on same  LAN. Mimiko <vbvbrj@gmail.com> - 2016-04-15 11:40 +0200
  Re: Incorrect arp reply when bonding and 3rd interface are on same LAN. Sven Hartge <sven@svenhartge.de> - 2016-04-15 12:40 +0200
    Re: Incorrect arp reply when bonding and 3rd interface are on same  LAN. Mimiko <vbvbrj@gmail.com> - 2016-04-15 14:20 +0200

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