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Submitted by themachine (Contact Author) (Forums) on Wed, 2005-11-02
19:58. :: Linux
Summary:
You can find an easier to read version here: 5dollarwhitebox.org
The concept of NIC Bonding (or sometimes called NIC Teaming) is that you have
two NICs bonded together to appear as if they are the same physical device.
I.e. They will both present the same Hardware (MAC) address. This is
accomplished through the ifenslave utility, which enables the kernel to see/use
only one device, while it sends out packtes via the two slave devices using a
round-robbin scheduler.
System: Debian Sarge 3.1 (vanilla kernel 2.6.12.4)
Modules Involved: bonding, mii, nic_module (e100 in this example)
Utilities: ifenslave, mii-tool
Preparation:
Before attempting to bond two NICs, it is highly recommended that you verify
the integrity and functionality of each NIC on its own. This document assumes
that you've already done that. Using 'mii-tool' you should see something like
the following:
testbox:/# mii-tool
eth0: negotiated 100baseTx-FD, link ok
eth1: negotiated 100baseTx-FD, link ok
In order for this to work, the kernel must have support for bonding
devices. A few ways to check would be:
testbox:/# modprobe --list | grep
bonding/lib/modules/2.6.12.4-vs2.0/kernel/drivers/net/bonding/bonding.ko
testbox:/# cat /boot/config-2.6.12.4-vs2.0 | grep -i bonding
CONFIG_BONDING=m
We use the mii-tool (mii.o module) to monitor the interfaces for
failover... though, as most ethernet adapters use an MII (Media
Independant Interface) to autonegotiate link speeds, its pretty standard
that you'd have this.
testbox:/# cat /boot/config-2.6.12.4-vs2.0 | grep -i mii# CONFIG_MPENTIUMII is
not set
# CONFIG_MPENTIUMIII is not set
CONFIG_MII=y
testbox:/# modprobe --list | grep -i mii
/lib/modules/2.4.26-2-686/kernel/drivers/net/mii.ko
Second, your going to need to install the ifenslave utility.
testbox:/# apt-get update && apt-get install ifenslave
.......... removed standard output (nothing interesting)
Theres no configuration here, so that is that. Now we are ready for
the configuration files.
Warm Regards
Dinesh Jadhav
Red Hat Certified Engineer
9224661100
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