Virtualization, KVM hypervisor

I started to explore KVM as full virtualization solution for Linux. The mail idea to sturdy different Oracle option on different platforms and emulate failure events to work out backup and recovery. Configuration and tuning is important part as well. So, I chosed KVM under KUbuntu 10.10. and started different installations. As I expected later there is a problem to communicate two virtual machines to each other. I asked google but didn't get definite answer. Accidentally I've found a solution lies in the plane of IP filters.

Wireless device for HP NoteBooks users who owns ProBook5420s, config

I have HP NoteBooks ProBook5420s. There is a little problem with driver in KUbuntu.

lspci|grep "Network controller:"
44:00.0 Network controller: RaLink RT3090 Wireless 802.11n 1T/1R PCIe

In spite of that the controller is RT3090 it works with rt3390sta driver.
lsmod |grep rt
rt3390sta 1153989 1

My attemts to enable wireless networking with rt3090sta driver were unsaccessfull.

Ram diska creation

Ram diska creation. It is very usefull if you like wardriving:)

# mkdir /tmp/ramdisk; chmod 777 /tmp/ramdisk

# mount -t tmpfs -o size=256M tmpfs /tmp/ramdisk/
or
# mount -t tmpfs tmpfs /tmp/ramdisk -o size=1G,nr_inodes=200k,mode=01777