Archive for the ‘Debian’ Category
July 16th, 2009 | 
Author: This post will explain how to disable IPv6 in a system running Debian GNU/Linux or Ubuntu Linux.
You should want to disable IPv6 for compatibility reason or if you not plan to use it for speed up your system and/or to avoid loading of unuseful modules on system start up.
For disable the protocol you have to edit
/etc/modprobe.d/aliases
file and change two lines as follow :
#alias net-pf-10 ipv6 net-pf-10 off
You should also tell to your kernel to not load IPv6 module by blacklisting it at the boot, for doing so edit
/etc/modprobe.d/blacklist
file adding the following line :
blacklist ipv6
Reboot your system and check with the following command if the module ipv6 is not present :
lsmod |grep ipv6
You’ve done
Hope this help
Bye
Riccardo
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Very often it happens that I must give support to a colleague or a customer on a Linux machine.
It’s very difficult to spell all bash command I will use to check which could be the problem, especially by phone.
When I discover “screen” it was a revelation.
With screen http://www.gnu.org/software/screen/screen.html you should share a linux session with other people.
You should use screen by simply ask to the user you want to assist to type on the console the following command :
screen
So if you can connect to the machine (even with ssh) you should run the following command :
screen -x
to share the same bash session.
Hope this help
Bye
Riccardo
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In some situation you may want to avoid loading a Linux driver module automatically . For example:
- In some cases buggy driver causes kernel BUG or system fault on load so you just want to avoid the problem.
- If your system connected without a diskette / floppy drive; kernel will try to load floppy driver – disable floppy driver or module.
The Linux kernel get module information on boot from /etc/modprobe.conf file and /etc/modprobe.d/* file(s).
If you are using RHEL or CentOS do the following :
open your /etc/modprobe.conf file and turn of auto loading using following syntax:
alias driver-name off
If you are using Debian or Ubuntu do the following :
open /etc/modprobe.d/blacklist file and add driver name using following syntax:
blacklist driver-name
Reboot your system and use lsmod command to show the status of modules in the Linux Kernel.
Hope this help
Bye
Riccardo
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This post will explain how to configure a DHCP Server running on Ubuntu Server 9.04 (Jaunty Jackalope) for more than one interfaces and more than one network.
This post assume you have :
- A private network with 192.168.123.0/24
Three network on which you have to assign dinamic IP Addresses, for example a LAB network, an SUP Network (Support) and a WIFI network with the following subnet.
- 192.168.124.0/24 (sup)
- 192.168.125.0/24 (lab)
- 192.168.127.0/24 (wifi)
This post also assume you have a system running ubuntu (or debian) with four (4) NIC each one connected to one of the network above, and you will have the following configuration :
SUP network
Server IP Address : 192.168.124.1
DHCP Scope : 192.168.124.100 – 192.168.124.200
Gateway : 192.168.124.254
LAB network
Server IP Address : 192.168.125.1
DHCP Scope : 192.168.125.100 – 192.168.125.200
Gateway : 192.168.125.254
WIFI network
Server IP Address : 192.168.127.1
DHCP Scope : 192.168.127.100 – 192.168.127.200
Gateway : 192.168.127.254
The name server for all the networks will be a server in the internal network (192.168.123.2).
First of all you have to install DHCP server, for doing so, type :
sudo apt-get install dhcp3-server
This post will explain hot-to configure a unique IP Address on multiple NICs (Phisical or Virtual) on Debian GNU/Linux (with a 2.6 kernel).
This post assume you have a 192.168.0.0/24 network and that you want to assign 192.168.0.10/24 to your system.
Read the rest of this entry »
Ethernet bonding refers to aggregate multiple ethernet channels together to form a single channel. This is primarily used for redundancy in ethernet paths or for load balancing. This page refers to ifenslave mode in particular to configure ethernet bonding on Linux systems, and so doesn’t limit itself to discussion of 802.3ad Trunk Aggregation.
I’ve used the following modes a lot of time under Debian or Ubuntu and on Open-E.
With the following command you could configure a proxy server (http and/or ftp) and use it for your current bash session or for apt.
This configuration will be lost when you close your shell.
export http_proxy=’http://user:password@proxy-server:port’
export ftp_proxy=’http://user:password@proxy-server:port’
Hope this help
Bye
Riccardo
