Netexpertise

All systems need bridge-utils package installed either with yum or apt-get.
 
Redhat / Fedora
Edit each network interface startup file that is going to be added to the bridge

[root@redhat ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:C0:4F:44:41:8A
ONBOOT=yes
BRIDGE=br0

 
And create the bridge configuration file

[root@redhat ~]# cat /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.100
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes
USERCTL=no
IPV6INIT=no
PEERDNS=no
ONBOOT=yes

 
Ubuntu

root@ubuntu:~# cat /etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback

auto br0
iface br0 inet static
[...]

Tags: bridge, debian, fedora, linux, network, redhat, Startup, ubuntu

Dynamips and dynagen let you create a virtual Cisco router on a Linux box. It would be even better if that router was reachable from the LAN, wouldn’t it? Going further, that same router could lead us to another couple of virtual routers running in a lab.
 
Download and Installation
Download dynamips and dynagen from dynagen.org. Pay [...]

Tags: brctl, bridge, Cisco, debian, dynagen, dynamips, fedora, linux, redhat, router, tap, ubuntu, virtualization

WPA encryption is not much hassle to set up and is way more secure than WEP if you use a strong pre-shared key.
 
First off, we’ve got a wifi interface that can be displayed with iwconfig (from the wireless tools):

[root@db ~]# iwconfig
lo no wireless extensions.

eth0 [...]

Tags: debian, fedora, linux, pre-shared key, redhat, ubuntu, wifi, wireless, WPA, wpa_supplicant