Linux NIC duplex settings & Routing

On Redhat:

/etc/sysconfig/network-scripts/ifcfg-ethX:

ETHTOOL_OPTS="speed 100 duplex full autoneg off"


Note: ETHTOOL_OPTS is documented in /usr/share/doc/initscripts-/sysconfig.txt.

Ref:

http://www.redhat.com/archives/taroon-list/2003-October/msg00014.html
http://www.cyberciti.biz/tips/howto-linux-add-ethtool-duplex-settings-permanent.html
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch03_:_Linux_Networking


Staitc Routes in RH:
/etc/sysconfig/network-scripts/route-
Try vi /etc/sysconfig/network-scripts/ifup-routes

Ref:
http://www.cyberciti.biz/tips/configuring-static-routes-in-debian-or-red-hat-linux-systems.html
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch03_:_Linux_Networking

Some changes in RHEL6 vs RHEL5 for RH Admins

1- If you have a HP server, onboard disks are always named: /dev/cciss/c0d0, etc.
In RHEL6, for devices attached to Smart Array using the hpsa dirver, the device
names will be /dev/sd but with ciss driver, you will see the old style name
convention.

2- Emergency mode has been removed from list of boot modes

3- Dracut has been replaced mkinitrd.

4- lvconvert --merge : Reverting to a previous snapshot

5- Tickless kernel and power management porfile support.

6- NFSv4 is the default NFS.

7- EXT-4 is the default filesystem.

8- Automated I/O alignment. SCSI and ATA standards have been extended to provide alignment and I/O hints, allowing automated tuning and I/O alignment

9- The new System Security Services Daemon (SSSD) provides centralized access to identity and authentication resources, enables caching and offline support

10- In virtualized environments, sVirt (powered by SELinux) protects guests from one another


To see more, http://www.europe.redhat.com/products/rhel/server/details/