Kernel Parameters

sadamahan

Hello Team

According to training material section 6.4 in LFS201, all run-time kernel parameters are supposed to be at /usr/share/doc/linux-doc/kernel-parameters.txt

I'm on Ubuntu 16.04 and can't seem to find "net.ipv4.icmp_echo_ignore_all" in the above kernel-parameters.txt documentation.

Questions:

1. When on the exam, how do I go about looking for a specific kernel parameter? 

2. When on the exam, where can I find a listing of all kernel parameters? 

Thanks in advance!

SMK

earlpearl

Hi

On my Ubuntu 16.04 VM, I also was not able to find "net.ipv4.icmp_echo_ignore_all" in kernel-parameters.txt, which I copied, and decompressed, from /usr/share/doc/linux-doc/.

But, if you type:

a. sudo sysctl net.ipv4.icmp_echo_ignore_all

OR

b. sudo sysctl -a | grep "net.ipv4.icmp_echo_ignore_all"

you will see it's current value.

Refer to 6.5 for more details. And, I expect you'll receive more info from others in the course.

zoomm10

Hi,

all kernel parameters:

https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html

coop

This is not a "kernel parameter" as such; it is something in /proc/sys/net as properly pointed out above.  Kernel parameters are those you specify on the kernel command line.  Some may have sysctl setting as well, but conceptually it is different.

luisviveropena

Hi,

Also consider that for the exam you will be working with Ubuntu 14.04, until further advise.

Regards,

Luis.