creating a fake network interface!! help

mtsm · 01-28-2009, 12:03 PM

Hi guys...i have a weird issue here.. our oracle team needs some linux machine for an oracle RAC , but it´s a fake oracle rac only for development/test purposes , as some of you might know oracle rac uses a dedicated interface for interconnect , as our RAC is a 'fake' one...it will be single...just one machine , and this interface has a configured ip but connects to no where....it has no cable , the problem is:

when the rac tries to up the database..it will check if there is conectivity at eth3 interface , as there is no cable , the database wont go up because of this. i dont want to pass a cable to connect no where.....what i was thinking is : is there a method to create a fake interface with link up? like the loopback interface? but it must be called eth3 ...

thanks for any help

cheftec · 01-28-2009, 01:22 PM

try this:

add to /etc/hosts
falseNetwork 192.168.99.99 (or something similar)

then
ifconfig eth3 falseNetwork
route add 192.168.99.99

then

ping falseNetwork

to see if it works. I don't know if this is what you need since I'm not familiar with Oracle RAC...

By the way, the admins frown on double posting in different categories... I think you're in the right category here.

ivanatora · 01-28-2009, 03:03 PM

Can you use an existing interface (I suppose the machine have at least one) and add an alias to it? In that way you will have IP address and the link will be up.
You want exactly the name "eth3"?

There is a file /etc/udev/rules.d/75-network-devices.rules where you can set a specific names per lan card based on its mac address.

ne pas · 01-28-2009, 08:10 PM

Quote:

Originally Posted by mtsm

when the rac tries to up the database..it will check if there is conectivity at eth3 interface , as there is no cable , the database wont go up because of this. i dont want to pass a cable to connect no where.....what i was thinking is : is there a method to create a fake interface with link up? like the loopback interface? but it must be called eth3 ...

thanks for any help

Yeah, you can create a "fake" or better dummy interface, by default it's called "dummy0" or "dummy" but you can change it with the ip tool.

Code:

$ ip link set name eth3 dev dummy0

Quakeboy02 · 01-28-2009, 09:21 PM

Glad you found an answer, but please don't open multiple threads for the same problem. If you open an thread and feel it should be somewhere else, it's best to click the report button and ask that your thread be moved.

mtsm · 02-01-2009, 02:29 PM

hi guys...thank you for the answer...i´ve just read the post but i found a way myself , just created a standalone bridge interface with brctl , added to /network-scripts/ with TYPE=Bridge , worked perfectly.

thanks