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[Xen-users] Xen bridge network issue with bonding interfaces

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xen bridge network issue with bonding interfaces
From: Marc Patino Gómez <mpatino@xxxxxxxxxxx>
Date: Wed, 13 Aug 2008 13:47:04 +0200
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Hi folks,

My Xen server has two networks, one public and other private. In the private network, I have some servers with bonded interfaces. I have a big problem with these ones because Xen guest lose conectivity with these servers. In my opinion this issue is due to an arp problem

My config:

Xen server with two NICs (one private and one public) and without bonded interfaces, and bridged networking :

suxen:~ # brctl show
bridge name    bridge id        STP enabled    interfaces
xenbr0        8000.feffffffffff    no        vif0.0
                           peth0
                           vif2.0
xenbr1        8000.feffffffffff    no        vif0.1
                           peth1
                           vif2.1

suxen:~ # brctl showmacs xenbr1
port no    mac addr        is local?    ageing timer
 2    00:15:17:71:52:0d    no          32.15
 2    00:15:17:71:52:65    no          23.06
 2    00:15:17:76:c2:8c    no          39.10
 3    00:16:3e:03:0a:17    no           0.23
 2    00:1c:2e:bc:a5:00    no          30.13
 2    00:1c:2e:bc:a5:3b    no          24.65
 2    00:1e:c9:d6:41:7c    no           0.23
 2    00:1e:c9:d6:41:88    no          37.06
 2    00:1f:28:c9:18:c0    no          33.70
 1    fe:ff:ff:ff:ff:ff    yes           0.00


Xen guest (suxmon) with conectivity problems to bonded linux servers:

suxmon:~ # arp
Address HWtype HWaddress Flags Mask Iface 192.168.100.63 (incomplete) eth1 172.17.90.254 ether 00:00:5E:00:01:01 C eth0 192.168.100.51 (incomplete) eth1 192.168.100.52 (incomplete) eth1 192.168.100.54 ether 00:1E:C9:D6:41:7C C eth1


So, in xenbridge xenbr1 I can see all mac of bonded servers ( I am using active-backup mode), but in the xen guest I lose conectivity with these servers. In syslog of xen guest I can see a strange message :

eth1: duplicate address detected!

it is strange because I have harcoded xen guest mac address in xenguest config file, and I cant see this mac address duplicate in my private network.

Any help will be welcome

Regards,

Marc

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