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Meaning of the default EIGRP metric

2009-12-26 por alvarezp

Introduction and motivation

I have always felt the EIGRP metric as being really overwhelming. I see values like «2820096» and instead of understanding it, I always end up asking what the hell does that number mean.

For example, in RIP:

R    192.168.0.0/24 [120/3] via 172.16.1.1, 00:00:15, FastEthernet0/0

Just by looking at the metric of «3» I immediately know what is means: there are three steps between the announced network and the router receiving the advertisement. Easy, right? «Understanding the number» makes it easy for me to manage and diagnose it.

In OSPF, the metric (cost) is still not as cumbersome as EIGRP’s. However, in the following example, can you identify what does «66» mean? For you, is it «just a number» that won over another because of its numerical value being lower? How do you know if the number is right or not?

O   192.168.0.0/24 [110/66] via 172.16.1.1, 00:00:82, FastEthernet0/0

Etiquette in e-mail message quoting

2013-04-242009-12-24 por alvarezp

This is a translation of my previous post Etiqueta en el citado de mensajes de e-mail.

Introduction

The most ignored Internet Etiquette rule is that of the posting style when replying to an e-mail message.

By «quoting» I mean the inclusion of a previous message in a new one (for example, a reply) with the intent of stating the relevance of the answer itself in the original context. I would say «Dan, I don’t know what are you talking about. Please quote the original e-mail in your reply next time in order to know what were you replying to.»

Almost every e-mail client do quote the original message in the reply, at least by default. That is good, and it contributes to the «netiquette», but its abuse has made it completely useless.

Bell on new line

2009-09-28 por alvarezp

To have a Linux beep each time a new line is printed on standard output, just filter your output through the following code: gawk ‘{print «07» $0 }’ This will effectively «prepend» a bell to each line. You can convert this into an alias or a command (say /usr/local/bin/line-beep.gawk): #!/usr/bin/gawk -f { print «07» $0; … Leer más

Opera and mysterious font aliasing problem in Ubuntu and Debian

2009-09-20 por alvarezp

Opera renders text without antialiasing under Ubuntu and Debian when a value in the font-family CSS property matches a «Core X» font before an Xft font.

That’s why Opera can be set to ignore core X fonts, by unchecking the Enable Core X fonts configuration option. You can use this as a workaround.

Making Opera work with Cisco Secure ACS 4.1.

2009-09-18 por alvarezp

This post should be called instead «Making Opera work around a Cisco Secure ACS 4.1 interoperability bug».

Continuing with the stream of web browser interoperability issues I recently found how to make Opera 10 work with a Cisco Secure Access Control Server 4.1.

The problem I experienced is briefly described as, clicking any option in the menu (in the left frame) will open the menu again in the right frame, instead of actually showing the selected option.