Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #941
Difficulty: Medium
A ping of death is a type of attack on a computer system that involves sending a malformed or otherwise malicious ping to a computer.
True or False?
Linux & Unix Commands - Search Man Pages

pppoe-sniff(8) [centos man page]

PPPOE-SNIFF(8)						      System Manager's Manual						    PPPOE-SNIFF(8)

pppoe-sniff - examine network for non-standard PPPoE frames SYNOPSIS
pppoe-sniff [options] DESCRIPTION
pppoe-sniff listens for likely-looking PPPoE PADR and session frames and deduces extra options required for pppoe(8) to work. Some DSL providers seem to use non-standard frame types for PPPoE frames, and/or require a certain value in the Service-Name field. It is often easier to sniff those values from a machine which can successfully connect rather than try to pry them out of the DSL provider. To use pppoe-sniff, you need two computers, a DSL modem and an Ethernet hub (not an Ethernet switch.) If the DSL modem normally connects directly to your computer's Ethernet card, connect it to the "uplink" port on the Ethernet hub. Plug two computers into normal ports on the hub. On one computer, run whatever software the DSL provider gave you on whatever operating system the DSL provider supports. On the other computer, run Linux and log in as root. On the Linux machine, put the Ethernet interface into promiscuous mode and start pppoe-sniff. If the ethernet interface is eth0, for exam- ple, type these commands: ifconfig eth0 promisc pppoe-sniff -I eth0 On the other machine, start your DSL connection as usual. After a short time, pppoe-sniff should print recommendations for the value of PPPOE_EXTRA. Set this value in /etc/ppp/pppoe.conf. If pppoe-sniff indicates that something special is required in PPPOE_EXTRA, please e- mail this to along with the name of your ISP and the manufacturer and model number of your DSL modem. This infor- mation will be collated and provided on the PPPoE web page for users who do not have two computers. After pppoe-sniff finishes (or you stop it if it seems hung), remember to turn off promiscuous mode: ifconfig eth0 -promisc OPTIONS
-I interface The -I option specifies the Ethernet interface to use. Under Linux, it is typically eth0 or eth1. The interface should be "up" and in promiscuous mode before you start pppoe-sniff. -V The -V option causes pppoe-sniff to print its version number and exit. BUGS
pppoe-sniff only works on Linux. AUTHORS
pppoe-sniff was written by David F. Skoll <>. The pppoe home page is SEE ALSO
pppoe-start(8), pppoe-stop(8), pppoe-connect(8), pppd(8), pppoe.conf(5), pppoe(8), pppoe-setup(8), pppoe-status(8), pppoe-server(8), pppoe- relay(8) 4th Berkeley Distribution 3 July 2000 PPPOE-SNIFF(8)

Check Out this Related Man Page

PPPOE-CONNECT(8)					      System Manager's Manual						  PPPOE-CONNECT(8)

pppoe-connect - Shell script to manage a PPPoE link SYNOPSIS
pppoe-connect [config_file] pppoe-connect interface user [config_file] DESCRIPTION
pppoe-connect is a shell script which manages a PPPoE connection using the Roaring Penguin user-space PPPoE client. If you omit con- fig_file, the default file /etc/sysconfig/network-scripts/ifcfg-ppp0 is used. If you supply interface and user, then they override the Ethernet interface and user-name settings in the configuration file. Note that normally, you should not invoke pppoe-connect directly. Instead, use pppoe-start to bring up the PPPoE connection. pppoe-connect first reads a configuration file. It then brings up a PPPoE connection. If the connection ever drops, a message is logged to syslog, and pppoe-connect re-establishes the connection. In addition, each time the connection is dropped or cannot be established, pppoe-connect executes the script /etc/ppp/pppoe-lost if it exists and is executable. The shell script pppoe-stop causes pppoe-connect to break out of its loop, bring the connection down, and exit. TECHNICAL DETAILS
pppoe-connect uses the following shell variables from the configuration file: ETH The Ethernet interface connected to the DSL modem (for example, eth0). USER The PPPoE user-id (for example, PIDFILE A file in which to write the process-ID of the pppoe-connect process (for example, /var/run/ Two additional files ($PID- FILE.pppd and $PIDFILE.pppoe) hold the process-ID's of the pppd and pppoe processes, respectively. By using different configuration files with different PIDFILE settings, you can manage multiple PPPoE connections. Just specify the con- figuration file as an argument to pppoe-start and pppoe-stop. AUTHOR
pppoe-connect was written by David F. Skoll <>. The pppoe home page is SEE ALSO
pppoe(8), pppoe-start(8), pppoe-stop(8), pppd(8), pppoe.conf(5), pppoe-setup(8), pppoe-status(8), pppoe-sniff(8), pppoe-server(8), pppoe- relay(8) 4th Berkeley Distribution 21 February 2000 PPPOE-CONNECT(8)

Featured Tech Videos