redundant ethernet interfaces

[Gleb Smirnoff]

On Fri, Feb 18, 2005 at 09:23:09AM +0100, Marko Lerota wrote:
M> I have two nic bge0 and bge0, and I would like them 
M> to have the same IP address in case that my redundant 
M> switch stop responding. Bridge is not an option, 
M> I tried with netgraph but I did not succeed. 
M> Does anyone have some solution?
M> 
M> here is my config 
M> 
M> rc.conf 
M> ifconfig_bge0="1.2.3.4 netmask 255.255.0.0 media 100baseTX mediaopt
M> full-duplex"
M> ifconfig_bge1="media 100baseTX mediaopt full-duplex"
M> 
M> and  /usr/local/etc/rc.d/bonding.sh
M> 
M>  #!/bin/sh
M> ifconfig bge1 up
M> kldload /boot/kernel/ng_ether.ko
M> kldload /boot/kernel/ng_one2many.ko
M> ngctl mkpeer bge0: one2many upper one
M> ngctl connect bge0: bge0:upper lower many0
M> ngctl connect bge1: bge0:upper lower many1
M> ngctl msg bge1: setpromisc 1
M> ngctl msg bge1: setautosrc 0
M> ngctl msg bge0:upper setconfig "{xmitAlg=1 failAlg=1 enabledLinks =[ 1
M> 1 ] }" 

M> I followed the examples from google groups and I stuck with
M> duplicated packets when both ethernets are plugged and 
M> 50% packet loss when one ethernet is unplugged, damn !!#@!#@!$%^@$#@

It is very strange that you have duplicates. Do you see duplicates of
incoming or outgoing packets?

50% packet loss is because to ng_one2many can't detect which link is
active and which is not. We have a solution for this in HEAD, but I'm
very sorry we can't MFC this to RELENG_5 due to ABI freeze. You can bring
up patches from HEAD to your system.

Actually, I'd better recommend you the following setup:

ifconfig bge0 up
ifconfig bge1 up
kldload /boot/kernel/ng_ether.ko
kldload /boot/kernel/ng_one2many.ko
kldload /boot/kernel/ng_eiface.ko
ngctl mkpeer bge0: one2many lower many0
ngctl connect bge1: bge0:lower lower many1
ngctl msg bge1: setenaddr ${MAC-address-of-bge0}
ngctl mkpeer bge0:lower eiface one ether
ngctl msg bge0:lower.one set ${MAC-address-of-bge0}
ngctl msg bge0:lower setconfig "{xmitAlg=1 failAlg=2 enabledLinks =[ 1 1 ] "
ifconfig ngeth0 1.2.3.4 netmask 255.255.0.0

Notice that I use failAlg=2, to make ng_one2many listen to flow control messages.
However, ng_ether can't send these messages in RELENG_5, see above.

And this setup is not guaranteed to work flawlessly unless you have a smart switch
and this two cables are plugged into one trunk group on switch.

M> manual for this sucks 

I plan to write a handbook chapter on netgraph sometime this year.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE