Charly's Column The Sysadmin’s Daily Grind: Arpalert

Nov 30, 2006

Corporate policies prohibit the unauthorized connection of hardware to the company network, threatening dire consequences in the case of non-compliance. Fair enough, but how do you actually go about catching somebody trying to plug an illegal laptop into your Ethernet?

more »

Ask Klaus!

Oct 31, 2006
No Connection Thank you for the comments in the September 2006 Linux Magazine regarding my IBM R50e laptop. I have......
more »

Charly's Column The Sysadmin’s Daily Grind: Ethtool

Mar 31, 2006

A touchy LAN that plays like a movie diva can spoil any admin’s day. Ethtool to the rescue!

more »

Netfilter L7 Blocking protocols at Layer 7 with the L7 patch

Feb 28, 2006

If you need a tool for filtering protocols that doesn’t depend on the port, try L7, an IPTables patch that operates through regular expressions.

more »

TCP Hijacking Understanding and preventing TCP attacks

Aug 31, 2005

It is quite easy to take a TCP connection down using a RST attack, and this risk increases with applications that need long-term connections, such as VPNs, DNS zone transfers, and BGP. We’ll describe how a TCP attack can happen, and we’ll show you some simple techniques for protecting your network.

more »

Charly's Column The Sysadmin’s Daily Grind: Smokeping

Apr 30, 2005

If you do not receive a response to a ping, or if the response is seriously delayed, you might like to take this as a warning. But who wants to ping all day? You need a ping-based monitoring utility like Smokeping.

more »

Issue 180/2015

Buy this issue as a PDF

Digital Issue: Price $9.99
(incl. VAT)


njobs Europe
Njobs Netherlands Njobs Deutschland Njobs United Kingdom Njobs Italia Njobs France Njobs Espana Njobs Poland
Njobs Austria Njobs Denmark Njobs Belgium Njobs Czech Republic Njobs Mexico Njobs India Njobs Colombia