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[Xen-users] received packet with own address as source address

  • To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Alexander Pirsig <alex@xxxxxxxxxx>
  • Date: Mon, 21 Sep 2009 10:47:32 +0200
  • Delivery-date: Mon, 21 Sep 2009 01:48:19 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
Hi,
we're running 4 xen servers on our network with multiple network cards. During HighLoad we experince degeneration of inbound network traffic through our loadbalancer. I might found a reason for it, in Dom0 dmesg output looks as follows: 

[1157421.975910] eth0: received packet with  own address as source address
[1157421.975957] eth0: received packet with  own address as source address
[1196172.762318] eth0: received packet with  own address as source address
[1196172.762370] eth0: received packet with  own address as source address
[1196172.762403] eth0: received packet with  own address as source address
[1196172.762436] eth0: received packet with  own address as source address
[1196265.876029] eth0: received packet with  own address as source address
[1196265.876078] eth0: received packet with  own address as source address
[1196265.876111] eth0: received packet with  own address as source address
[1196265.876144] eth0: received packet with  own address as source address
I did a search on google and found: http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=339 but I also found a side that suggests to turn off arp entirely for your xenbr0.
Enclosed is my network configuration and the output for my bridges. As you see I'm not reseting my Mac address of the physical interface to FE:FF:FF:FF:FF:FF or turn arp off. I'm using Debian Lenny with kernl 2.6.26-2-xen-amd64 

===================================

# The loopback network interface
auto lo eth0 eth1 eth2 eth3
iface lo inet loopback


# xenbr0 -> eth0
auto xenbr0
iface xenbr0 inet static
       address 192.168.0.78
       netmask 255.255.255.0
       network 192.168.0.0
       broadcast 192.168.0.255
       gateway 192.168.0.2
       dns-nameservers 192.168.0.88
       bridge_ports eth0
       bridge_stp no
       bridge_fd 2

# xenbr1 -> eth1
auto xenbr1
iface xenbr1 inet manual
       bridge_ports eth1
       bridge_stp no
       bridge_fd 2

# xenbr1 -> eth1
auto xenbr2
iface xenbr2 inet manual
       bridge_ports eth2
       bridge_stp no
       bridge_fd 2

# xenbr1 -> eth1
auto xenbr3
iface xenbr3 inet manual
       bridge_ports eth3
       bridge_stp no
       bridge_fd 2

===================================

brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.001ec9edee86       no              eth0
                                                       vif11.0
xenbr1          8000.001ec9edee88       no              eth1
                                                       vif7.0
xenbr2          8000.001517853a12       no              eth2
                                                       vif2.0
                                                       vif5.0
xenbr3          8000.001517853a13       no              eth3
                                                       vif4.0

===================================
ifconfig eth0 Link encap:Ethernet HWaddr 00:1e:c9:ed:ee:86 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:353936209 errors:0 dropped:0 overruns:0 frame:0 TX packets:539964989 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:90307422234 (84.1 GiB) TX bytes:158414382227 (147.5 GiB) Interrupt:16 Memory:f8000000-f8012100
eth1 Link encap:Ethernet HWaddr 00:1e:c9:ed:ee:88 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 
         RX packets:1947394344 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1948580678 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 RX bytes:548745607526 (511.0 GiB) TX bytes:383546238463 (357.2 GiB) Interrupt:16 Memory:f4000000-f4012100 eth2 Link encap:Ethernet HWaddr 00:15:17:85:3a:12 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 
         RX packets:301633931 errors:0 dropped:0 overruns:0 frame:0
         TX packets:326616376 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 RX bytes:84510247135 (78.7 GiB) TX bytes:160902850142 (149.8 GiB) Memory:fc3e0000-fc400000 eth3 Link encap:Ethernet HWaddr 00:15:17:85:3a:13 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 
         RX packets:4529239537 errors:0 dropped:129 overruns:0 frame:0
         TX packets:2456186725 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 RX bytes:557730056841 (519.4 GiB) TX bytes:329185143233 (306.5 GiB) Memory:fc3a0000-fc3c0000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:120605 errors:0 dropped:0 overruns:0 frame:0
         TX packets:120605 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 RX bytes:66133052 (63.0 MiB) TX bytes:66133052 (63.0 MiB)
vif11.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 
         RX packets:315792060 errors:0 dropped:0 overruns:0 frame:0
         TX packets:200025486 errors:0 dropped:120 overruns:0 carrier:0
collisions:0 txqueuelen:32 RX bytes:77164903933 (71.8 GiB) TX bytes:46200681260 (43.0 GiB)
vif2.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 
         RX packets:348647001 errors:0 dropped:0 overruns:0 frame:0
         TX packets:298756316 errors:0 dropped:371 overruns:0 carrier:0
collisions:0 txqueuelen:32 RX bytes:194069348655 (180.7 GiB) TX bytes:82457846658 (76.7 GiB)
vif4.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 
         RX packets:2456187623 errors:0 dropped:0 overruns:0 frame:0
         TX packets:4527772736 errors:0 dropped:25 overruns:0 carrier:0
         collisions:0 txqueuelen:32
RX bytes:294801705523 (274.5 GiB) TX bytes:557135764150 (518.8 GiB) 

vif5.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
         UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
         RX packets:18948974 errors:0 dropped:0 overruns:0 frame:0
         TX packets:49501981 errors:0 dropped:69 overruns:0 carrier:0
         collisions:0 txqueuelen:32
         RX bytes:11853699794 (11.0 GiB)  TX bytes:52336188222 (48.7 GiB)

vif7.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
         UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
         RX packets:1373054461 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1518581595 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:32
RX bytes:202298372493 (188.4 GiB) TX bytes:430015450340 (400.4 GiB) 

xenbr0    Link encap:Ethernet  HWaddr 00:1e:c9:ed:ee:86
         inet addr:192.168.0.78  Bcast:192.168.0.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:22766594 errors:0 dropped:0 overruns:0 frame:0
         TX packets:22917123 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:9752886671 (9.0 GiB)  TX bytes:17044210276 (15.8 GiB)

xenbr1    Link encap:Ethernet  HWaddr 00:1e:c9:ed:ee:88
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:2042397 errors:0 dropped:0 overruns:0 frame:0
         TX packets:2306 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:97427437 (92.9 MiB)  TX bytes:96852 (94.5 KiB)

xenbr2    Link encap:Ethernet  HWaddr 00:15:17:85:3a:12
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:3009732 errors:0 dropped:0 overruns:0 frame:0
         TX packets:2311 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:185132615 (176.5 MiB)  TX bytes:97062 (94.7 KiB)

xenbr3    Link encap:Ethernet  HWaddr 00:15:17:85:3a:13
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:3414734 errors:0 dropped:0 overruns:0 frame:0
         TX packets:2397 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:240016669 (228.8 MiB)  TX bytes:100674 (98.3 KiB)

===================================

thanks for you're help.

Regards,

Alex

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