The following article describes various methods of sending files as email attachment in Linux command line:
http://www.shelldorado.com/articles/mailattachments.html
Wednesday, January 9, 2008
Sending Files as Email Attachments
Sunday, January 6, 2008
Ethernet Bridge
A bridge is a way to connect two Ethernet segments together in a protocol independent way. Packets are forwarded based on Ethernet address, rather than IP address (like a router). Since forwarding is done at Layer 2, all protocols can go transparently through a bridge.
Bridging is supported in the current Linux kernels (2.4 and 2.6) from all the major distributions. The required administration utilities are in the bridge-utils package in most distributions.
Setup an Ethernet bridge in Debian
- Install two Ethernet LAN cards in a PC with Debian installed. The original LAN card is named "eth0" and the newly installed LAN cards are named "eth1" and "eth2".
- Install the bridge administration tools:
# apt-get install bridge-utils - Setup a bridge between eth1 and eth2 by the following commands:
# ifconfig eth1 0.0.0.0
# ifconfig eth2 0.0.0.0
# brctl addbr br0
# brctl addif br0 eth1
# brctl addif br0 eth2
# ifconfig br0 up
Network Emulation
"Netem"provides network emulation functionality for testing protocols by emulating the properties of wide area networks. The current version emulates variable delay, loss, duplication and re-ordering.
Netem is already enabled in Linux kernel 2.6 and it is controlled by the command line tool "tc" which is part of the iproute or iproute2 package of tools.
http://www.linux-foundation.org/en/Net:Netem
In Debian, we need to install the iproute package in order to use "tc":
# apt-get install iproute
Another famous network emulation tool is "NIST Net":
http://www-x.antd.nist.gov/nistnet/
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