Comments on: How to configure network bonding in Linux

By: Keith

Keith — Thu, 17 May 2012 15:38:12 +0000

Hey @Antonio, typically you would accomplish that by stacking your two switches together and creating a lacp group with the ports split between the two switches. If your switches aren’t stackable, you could accomplish a similar level of redundancy and performance by utilizing a different bonding mode.

Hope that helps

By: Antonio

Antonio — Thu, 17 May 2012 10:23:32 +0000

Hello all. Thank you for your post, its very interesting.

I have a question. I have a machine with 6 ethernet nics. So, I would like to set up a bond interface using mode=4 for improve band with speed and fault tolerance. But, I would like to connect three of those nics to one chasis and the rest to other chasis, Its possible to configure one lacp port in one switch and other one in the other chasis?

I dont know if this question its so stupid…

Thank you.

By: TP-Link TL-SG3210, 8-Port, Managed Switch » Philipp Klaus's Computing Blog

TP-Link TL-SG3210, 8-Port, Managed Switch » Philipp Klaus's Computing Blog — Fri, 13 Apr 2012 20:59:55 +0000

[...] The linux kernel module bonding implements LACP when loaded with the parameter mode=4. More about LACP configuration on IOS switches, Dell switches and Linux machines on http://backdrift.org/howtonetworkbonding. [...]

By: Scorcy

Scorcy — Sat, 10 Mar 2012 07:47:59 +0000

If you use LACP for bonding (mode=4) then you will in fact double link speed (for example 2x 100 Mbps = 200 Mbps or 2x 1 Gbps = 2 Gbps).

As far as I know if one port goes down your link will still be up but at 1 Gbps.

There are some redundancy modes as well which will not increase speed but just increase redundancy. LACP more or less does both (though speed is halved if one link is down), but the mode where all data is sent twice will deliver the best redundancy; it’s like RAID1 in network throughput

By: Thomas

Thomas — Tue, 28 Feb 2012 12:51:16 +0000

Thanks for the quick infos about port channel / lacp. peace.

By: musa

musa — Wed, 08 Feb 2012 10:50:07 +0000

Hi,

i am using centos 5.5 as a firewall and have three ethernet ports on it as:
eth0 – 192.168.2.1 (LAN port)
eth1 – 202.xx.xx.94 (WAN1)
eth2 – 202.xx.xx.93 (WAN2)

i want to bond the two WAN ports for outgoing traffic, can i do that?
and if yes, what should i do to their assigned public IPs?… configure or not? and what IP should i assign to bond0 interface in that case?

Please help!!!

regards

By: Linux Ethernet Bonding – WTF?! « Bill Sigmund

Linux Ethernet Bonding – WTF?! « Bill Sigmund — Mon, 13 Jun 2011 13:51:56 +0000

[...] http://backdrift.org/howtonetworkbonding [...]

By: darkfader

darkfader — Sun, 24 Apr 2011 23:35:09 +0000

for scaling above 1gbit between two hosts:

hash by src-ip – dst-ip-port – some switches can do that.

also note that the bonding driver in centos5 / rhel5 is said to be not smp-capable, bringing in its’ own performance issues (see the presentation about mysql by facebook)

By: Damon

Damon — Thu, 24 Feb 2011 21:04:42 +0000

Great how-to.
Daniel, as I understand it, you’re not going to get a 2gig session, however if someone else connects to the same endpoint as you at or near the same time, I believe that their session/connection will go over the unused 1gig line. so instead of both of you clogging up one port, you’ll be split and each able to have your own port. Any successive connections will probably be determined by the OS.

By: Daniel Feenberg

Daniel Feenberg — Sat, 29 Jan 2011 12:51:47 +0000

Before I try this – I have a question. Will it allow a single process to transfer data over both ports to a single destination? That is, if I have 2 gigabit ports and want to copy a file will the copy use both ports and possibly go at more than 1 gigabit per second? Or is the selection of a port deterministic and the transfer will use only one port?

Thanks for any guidance.
Dan Feenberg
NBER