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IP layer link aggregation w/o switch support

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http://www.linuxquestions.org – I'm looking for a way (kernel patches, configuration, etc) to bond multiple network interfaces together ... but for limited purposes. Here's the setup. Machines A, B, C, and D each have 4 NICs, each of which are on separate unmanaged switches. The connections are made in a corresponding way ... e.g. eth0 of each machine are connected via switch 0, eth1 are connected via switch 1, etc. There are also other machines which have only one NIC and are connected to switch 0 only. All NICs for A/B/C/D and the switches are gigabit speed. The remaining machines have a low traffic level. Machines (HowTos)

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Submitted by robot1 on 09/02/2010

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I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For example, if I have several servers that all have two nics each, and two separate switches, do I just configure the bonds and plug 1 nic from each into switch #1 and the other from each into switch #2?

I have a system with more than 50 different Linux machines (BLADE machines) with the following IP range 165.23.1.21-165.23.1.64 ( each Linux machine have 4 eth - eth1,2,3,4)

The system connected to 4 Cisco switches via LANS cable

My target is to verify each eth in the Linux machine were this eth connected to which port in the switch

for example

linux_machine1_eth0 connected to switch_1_po

Initial Setup

As a Linux administrator you have installed a fresh Linux box with 6 NICs eth0 to eth5. The eth0 interface is correctly configured and all other interfaces are currently up but without IP address. The network guys have simply attached four cables to this box.

I have several servers that we have bonded some NICs for rundancy and they will of course switch from primary to secondary NIC if connection state is lost to the switches they are physically connected to, but is there any way to be able to sense upstream connectivity (off switch) for each NIC and failover even though the NIC itself has a connection state to the switch it is plugged into?

Configured Clear OS to be in Gateway mode on a machine with two NIC cards.

eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity.

eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch.

LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS ga

I got stuck with one problem I cant find solution. I have linux pc with two NIC.

I have the following items:

Primergy BX600 MMB3 10 x BX620 S4 2 x Switch Blade (PG-SW107) QNAP (TS-EC1279U-RP – QNAP) (4 x Gigabit Connections) HP Pro curve Switch (2510g-48 (JA9280-A))

Patch Panel connecting all ports from the (2 x Switch Blade (PG-SW107)) to the patch panel

What I would like to do:

I have setup everything except the network switches.

This afternoon, with no changes to the network, a switch suddenly started dropping off lots of connections. These connections would come back up a few minutes later, then another area connected to the switch would drop off. This is an older 4006 chassis switch which could in and of itself be a problem but I'm looking to see what else you all would look for in trying to find a root cause.

I have the following set up:

Server (CentOS 5) -eth0: connected to DLink wireless switch LAN port -eth1: connected to local network

The server is running a PPPoE server (specifically, rp-pppoe). I also have iptables forwarding eth1 to eth0.

I have a computer running Windows XP connected to the wireless switch (LAN) as well.