Temas tecnicos sobre IP

http://www.makkahmatch.com/index.php?option=com_content&view=article&id=53:nortelipphonefirmware&catid=44:nortelipphones&Itemid=74
Latest UNIStim Firmware Release 3.1 for Nortel IP phone sets
Nortel IP Phones i2001, i2002, i2004 (all phase 2 sets only), 1110, 1120E, 1140E, 1150E, 1210, 1220, and 1230

0604DCG for Phase II IP Phones (2001, 2002 & 2004),

0621C6H for IP Phone 2007,

0623C6J, 0624C6J, 0625C6J and 0627C6J for IP Phone 1110, [...]

http://blog.michaelfmcnamara.com/2007/10/dhcp-options-voip-part-2/
In a previous article we reviewed how to configure a Nortel Ethernet Routing Switch 5520 using ADAC/LLDP (802.1ab) so a Nortel Internet Telephone could discover the voice VLAN ID automatically without manually configuration of the phone.
If you don’t have a switch that supports ADAC/LLDP you can still utilize automatic VLAN assignment using DHCP. I’ve actually [...]

The handshake is just like Avaya’s in that the phone does a couple things:

1. It requests options (via option 55) 43,128,144,157,191 from the DHCP
server.
2. It then gets an address, and one of the options is the Tagged VLAN it
is “supposed” to be on
3. It then drops the address and re-requests its ip info from the [...]

http://blog.michaelfmcnamara.com/2008/01/isc-dhcp-server-nortel-voip/
However, since there was so much interest I decided to setup a lab (at home) with a i2002 phone and a server running CentOS v5.0. I installed dhcp-3.0.5-7.el5 via YUM and came up with a sample dhcpd.conf file that anyone should be able to modify to meet their specific needs.

#
# DHCP Server Configuration file.
# [...]

http://www.linuxtopia.org/online_books/system_administration_books/ubuntu_starter_guide/ch07s04.html

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What is a DHCP Server?

A Dynamic Host Configuration Protocol (DHCP) server dynamically assigns IP addresses and other network setting for a given network to other networked PCs that ask. This simplifies network administration and makes connecting new PCs to a network much easier.

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How do I install a DHCP Server?

For these examples we are using “eth0” and [...]

http://www.ubuntugeek.com/how-to-install-and-configure-dhcp-server-in-ubuntu-server.html
A DHCP Server assigns IP addresses to client computers. This is very often used in enterprise networks to reduce configuration efforts. All IP addresses of  all computers are stored in a database that resides on a server machine.
A DHCP server can provide configuration settings using two methods
Address Pool
This method entails defining a pool (sometimes also called a [...]

https://help.ubuntu.com/8.04/installation-guide/i386/install-tftp.html
One free software DHCP server is ISC dhcpd. For Ubuntu, the dhcp3-server package is recommended. Here is a sample configuration file for it (see /etc/dhcp3/dhcpd.conf):

option domain-name “example.com”;
option domain-name-servers ns1.example.com;
option subnet-mask 255.255.255.0;
default-lease-time 600;
max-lease-time 7200;
server-name “servername”;

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.200 192.168.1.253;
option routers 192.168.1.1;
}

host clientname {
filename “/tftpboot/tftpboot.img”;
server-name “servername”;
next-server servername;
[...]

Generating an SSL Certificate with Apache+mod_ssl
http://slacksite.com/apache/certificate.php
Introduction
This document is intended to be a quick guide to generating and installing an SSL certificate on an Apache web server with the mod_ssl module. While this is not an overly difficult process, it does involve running several long commands with numerous options. This document should be all that you [...]

Creando Transparencias en los PNG con PHP

HOWTO: Make WordPress plugins work with WP Super Cache.