Archive for the 'Networking' Category


WiFi signal hacks….

Wednesday, June 6th, 2007

As long as there have been wireless networks there have been people trying to squeeze out just a bit more range… there was the cantenna and now there are other variations on trying to collect and improve the amount of signal getting to wireless adapters… here is just a sampling of what I’ve looked at [...]

Yet another domain tools site.

Wednesday, May 9th, 2007

For a while dnsstuff.com has been my favorite dns tools web site, but there are others. Recently I was pointed to domaintools.com.    Send article as PDF   

Emailing large files….

Monday, March 5th, 2007

There are lot’s of ways to get a file from one place to another, emailing is the first that many think of. (For larger files I’ll usually just upload to a directory on the website and then email a link…) The problem with email is multiple…. 1)viruses exploit email as a delivery vehicle and so [...]

Zeroshell Livecd – providing main network services

Wednesday, February 21st, 2007

http://www.zeroshell.net/eng/ is an interesting bundle of linux designed to be an out of the box network service swiss army knife of sorts. Here are the network services that it provides…. Kerberos 5 authentication, LDAP, NIS, Radius authentication, x509 certificate authority, unix and windows compatible active directory services, router, implements bridging and vlan protocols, full radius [...]

Handy DNS tools online

Monday, January 29th, 2007

There are some tools that I make use of almost daily. Either because something strikes my curiousity or because of necessity to find out a bit more about a computer issue. DNS lookup tools fall into the category of “must have” for the kind of stuff I wind up doing. Whether it’s a whois lookup [...]

Offline web browsing script

Saturday, January 27th, 2007

In the US and Europe and many more developed parts of the world we take our internet connectivity these days for granted. (And some go into panic attacks when it’s not available…) In some parts of the world though internet connections are not as wide/broad and peak usage times can make for very slow viewing, [...]

UDP problem…

Wednesday, January 24th, 2007

I found a peculiar problem while I was setting up an openvpn link the other day. The goal was a simple shared key setup and I started with the sample configuration and modified it a bit to fit the circumstances, I allowed the correct UDP port through the firewall (I think 1194 if I recall [...]

Blacklists and rejecting mail with Sendmail

Monday, January 22nd, 2007

A long time ago I had found how easy it was to reject messages outright with Postfix that came from non-existent domains. You know… junk from asdflkjuasdlfkjh@imadethisupmyselfanditsnotregisteredanywhere.com Well, since the mailserver at THIS site runs sendmail I wanted to fix sendmail the same as my home server. My home server is postfix based and uses [...]

More postfix spam blocking and Whitelisting….

Monday, January 22nd, 2007

I almost forgot to pass along a link to a more comprehensive detailing of postfix’s anti-uce controls…. here. Also, in the last article I briefly mentioned whitelisting. IF you intend to have several blacklists active it will pay to learn how to whitelist before you HAVE to. To do so, I simply created a text [...]

iScsi and AoE with linux

Sunday, January 21st, 2007

A few days ago I had reason to investigate iscsi and AoE (ata over ethernet). Both are protocols for sharing a physical drive over the network at the block level. Let me put it in context first. Traditional network file shares have been done like this…. Computer A has a large drive, it’s formatted and [...]

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