Hi Zaman, There are some configurations that need to be made to the switch to allow both nics to come up with the same mac. I am by no means a network expert, so I cannot think of the name of the protocol off the top of my head. I am willing to wager that the lack of that configuration is the cause of your packet loss. <div class="gmail_quote">On Nov 9, 2012 8:22 PM, "Zama Ques" <<a href="mailto:queszama@yahoo.in">queszama@yahoo.in</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> ----- Original Message ----- From: Digimer <<a href="mailto:lists@alteeve.ca">lists@alteeve.ca</a>> To: Zama Ques <<a href="mailto:queszama@yahoo.in">queszama@yahoo.in</a>>; linux clustering <<a href="mailto:linux-cluster@redhat.com">linux-cluster@redhat.com</a>> Cc: Sent: Saturday, 10 November 2012 8:24 AM Subject: Re: [Linux-cluster] Packet loss after configuring Ethernet bonding On 11/09/2012 09:26 PM, Zama Ques wrote: > Hi All, > > Need help on resolving a issue related to implementing High Availability at network level . I understand that this is not the right forum to ask this question , but since it is related to HA and Linux , I am asking here and I feel somebody here will have answer to the issues I am facing . > > I am trying to implement Ethernet Bonding , Both the interface in my server are connected to two different network switches . > > My configuration is as follows: > > ======== > # cat /proc/net/bonding/bond0 > > Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009) > > Bonding Mode: adaptive load balancing Primary Slave: None Currently > Active Slave: eth0 MII Status: up MII Polling Interval (ms): 0 Up Delay > (ms): 0 Down Delay (ms): 0 > > Slave Interface: eth0 MII Status: up Speed: 1000 Mbps Duplex: full Link > Failure Count: 0 Permanent HW addr: e4:e1:5b:d0:11:10 Slave queue ID: 0 > > Slave Interface: eth1 MII Status: up Speed: 1000 Mbps Duplex: full Link > Failure Count: 0 Permanent HW addr: e4:e1:5b:d0:11:14 Slave queue ID: 0 > ------------ > # cat /sys/class/net/bond0/bonding/mode > > balance-alb 6 > > > # cat /sys/class/net/bond0/bonding/miimon > 0 > > ============ > > > The issue for me is that I am seeing packet loss after configuring bonding . Tried connecting both the interface to the same switch , but still seeing the packet loss . Also , tried changing miimon value to 100 , but still seeing the packet loss. > > What I am missing in the configuration ? Any help will be highly appreciated in resolving the problem . > > > > Thanks > Zaman > You didn't share any details on your configuration, but I will assume > you are using corosync. > The only supported bonding mode is Active/Passive (mode=1). I've > personally tried all modes, out of curiosity, and all had problems. The > short of it is that if you need more that 1 gbit of performance, buy > faster cards. > If you are interested in what I use, it's documented here: > <a href="https://alteeve.ca/w/2-Node_Red_Hat_KVM_Cluster_Tutorial#Network" target="_blank">https://alteeve.ca/w/2-Node_Red_Hat_KVM_Cluster_Tutorial#Network</a> > I've used this setup in several production clusters and have tested > failure are recovery extensively. It's proven very stable. :) Thanks Digimer for the quick response and pointing me to the link . I am yet to reach cluster configuration , initially trying to understand ethernet bonding before going into cluster configuration. So , option for me is only to use Active/Passive bonding mode in case of clustered environment. Few more clarifications needed , Can we use other bonding modes in non clustered environment . I am seeing packet loss in other modes . Also , the support of using only mode=1 in cluster environment is it a restriction of RHEL Cluster suite or it is by design . Will be great if you clarify these queries . Thanks in Advance Zaman -- Linux-cluster mailing list <a href="mailto:Linux-cluster@redhat.com">Linux-cluster@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-cluster" target="_blank">https://www.redhat.com/mailman/listinfo/linux-cluster</a> </blockquote></div>