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

[Marc Patino Gómez <mpatino@xxxxxxxxxxx>]

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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