Best place to set nic parameters

Where is the best place to set the NIC paramters on a linux box so that
it retained after reboot?
We are running Red Hat Linux ES version.

1) Add a line with ethtool command to /etc/rc.local
Or

2) Add ETHTOOL_OPTS="speed 100 duplex full autoneg off" into
/etc/sysconfig/network-scripts/ifcfg-eth0

Or

3) Add a line to /etc/modules.conf (right after the line 'alias eth0
abc'):
options abc Speed=100 Duplex=2


As per one of the quotes online 'modules.conf' seem to be most
appropriate?

Need to know the pros/cons of each.
Any thoughts?


TIA,
Raj

It seems to me that the parameters are associated with the hardware. If
you added another NIC and the "abc" NIC became eth1, you would want the
parameter change to move too. That suggests that modules.conf is the
right place.

Just IMHO of course :-)