Re: enable duplex
On Thursday 15 July 2004 11:00, Jacob Friis Larsen hurled the following on the
wire:
> I have a HP ProLiant DL140 with Integrated Dual Broadcom 10/100/1000 NICs.
>
> Am I correct that duplex means that I can use the two jacks as one?
No, I'm affraid not. The 'duplex full' means that the NIC is in full duplex
mode. Another option is half duplex mode.
Full duplex means that the card will do transmitting and receiving at the same
time. Half duplex means that it will either transmit or receive.
Typically you want your card to be in full duplex. However, the card can
negatiate it's own duplex setting. That's what the 'autoneg' parameter id
for. Set it on to let the card negotiate the settings. Autonegotitation
should be fine and worry free for you.
> What happens if one of the jacks suddenly is not connected?
If you want to use both interfaces as one (so that the link stays up if one is
disconnected) you need to use bonding:
http://www.sourceforge.net/projects/bonding/
Quick howto (but please read the documentation first):
Make sure that the bonding module is installed in your kernel.
Bonding should be included in the output of lsmod.
To set up failover, you should configure the 2 interfaces first (each with an
ip address)
Configure the bonding module with the following command:
modprobe bonding miimon=250 mode=1
The miimon parameter sets the timeout between the checks for interface
connectivity. Thus an interface failure can be undetected for max. 250
milliseconds (a quarter of a second).
Next we configure the virtual interface:
ifconfig bond0 10.100.20.230
Finally we enslave the other interfaces:
ifenslave bond0 eth0 eth1
Make sure to change the ip addresses as needed. Also, this is from a redhat
server, but it shouldn't be to different from debian.
Good luck
joost
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