Ubuntu 10.10 en un Toshiba Dynabook UX/ NB200 / NB205

Cal retocar els parametres d'arrencada del nucli que venen en el GRUB:

sudo vim /etc/default/grub

Buscar la linia
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

i canviar-la per:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapci_timer clocksource=jiffies"

Actualitzar el GRUB:
sudo update-grub

reboot

Altres formes:

LiveCD:

• Despres del boot, despres de la BIOS premer [ESC] per entrar al prompt del syslinux
• escriure "live intel_idle.max_cstate=0" i [enter]

Despres d'instal·lar:

• Despres del boot, despres de la BIOS, premer [shift] esquerra per tenir el prompt del GRUB
• Premer [e] per editar els parametres de boot, afegir "intel_idle.max_cstate=0" despres de "splash"
• Premer [ctrl + x] per fer el boot.

VLAN Access Control Lists (VACLs)

When you want to filter traffic that is moving from one VLAN to another, things are real CCNA-like and friendly We use an Access Control List. In fact, we should elaborate on that term a bit now in light of this discussion. We actually use a Router-based Access Control List or RACL.

But what if we want to filter traffic that is flowing within a VLAN? On no, a Router-based Access Control List cannot help us! This is when we turn to the VLAN Access Control List. To help us understand this feature, let us create a topology and a sample scenario.

NOTA: es un recordatori, cal traduir i adaptar l'article.

Suposant que volem filtrar la VLAN 55, quan s'enrouta. En el switch que fa el IVR, apliquem la llista d'acces següent:

Literatura:

• Cisco Configuring Port ACLs and VLAN ACLs
• Securing Networks with Private VLANs and VLAN Access Control List

Configurar el Syslogd del MacOS X

Editar l'arxiu /etc/syslog.conf :
Afegir
*.*                                       @192.168.1.12
o
*.*                                       @192.168.1.12:5140
si no fem servir el port estandad, i reniciar el syslogd:

Per saber si esta en marxa i enviant els logs, podem injectar algo en el syslog:

i el el servidor de syslog hem de veure:

Enabling High Performance Data Transfers

System Specific Notes for System Administrators (and Privileged Users)


These notes are intended to help users and system administrators maximize TCP/IP performance on their computer systems. They summarize all of the end-system (computer system) network tuning issues including a tutorial on TCP tuning, easy configuration checks for non-experts, and a repository of operating system specific instructions for getting the best possible network performance on these platforms

This material is currently under active revision. Please send any suggestions, additions or  corrections to us at nettune@psc.edu so we can keep the information here as up-to-date as possible.

• Introduction
• Tutorial
  • Bandwidth*Delay Products (BDP)
  • Buffers
  • Computing the BDP
• High Performance Networking Options
  • Maximum Buffer Sizes on the host
  • Socket Buffers sizes
  • Negotiating TCP Large Windows options (RFC1323)
  • TCP Selective Acknowledgments (SACK, RFC2018)
  • Path MTU
• Using Web Based Network Diagnostic Servers
  • Quick Link: NPAD Pathdiag end system and last mile diagnostics at PSC
    • Quick Link: NPAD Documentation and additional servers.
  • Quick Link: SYN Test Server
  • Quick Link: ORNL Bandwidth Tester
  • Quick Link: ANL Network Diagnostic Tool
• Detailed Procedures for System tuning and Raising network limits for:
  • FreeBSD
  • on Linux
  • on Macintosh OS X
  • on Sun Solaris Systems
  • on Windows XP
  • or on other historical Operating Systems.
• Acknowledgments

Eliminar Apple Remote Desktop

Per desinstal·lar totalment el Apple Remote Desktop, s'ha d'esborrar a manija:
Esborrar l'aplicació i


Instruccions d'Apple: Uninstalling the Administrator Software


Mes info en els Forums de suport d'Apple: http://discussions.info.apple.com/message.jspa?messageID=10056322

Si la rao d'esborrar es perque l'aplicació casca, abans de posar el SN ni obrir, cal actualitzar l'aplicació descarregant de la web l'actualitzador: http://support.apple.com/downloads/#appleremotedesktop

Exportar directoris via NFS amb Snow Leopard

Robat de: How to Share Directories over NFS with Mac OS X by Chris BeHanna, chris@behanna.org


Edita /etc/exports:

Afegeix una linia com la següent (suposant que la xarxa es 192.168):

/Users -alldirs -network 192.168.0.0 -mask 255.255.0.0

Activa nfsd:

O reinicia el nfsd:

Verifica els exports: showmount -e

Munta el directori desde una alte maquina:

Per un altre Unix, pot haver-se de fer servir la comanda mount -t nfs.

ghettoVCBg2 - Free alternative for backing up VMs in ESX(i) 3.5 and 4.x

This tool is the follow up release of the ghettoVCB backup utility which allows users to perform backups of virtual machines residing on ESX(i) 3.5+/4.x+ servers using methodology similar to VMware's VCB tool. By incorporating highly constructive feedback from the VMware  community and utilizing the existing VI API, ghettoVCB’s framework was  completely rewritten to be harder, better, faster, stronger.

The primary motivation for ghettoVCBg2 was to provide ESXi users with  access to the utility without relying on unlocking and utilizing the  unsupported console. To satisfy this requirement, the rebuilt framework  takes advantage of the

VI Perl Toolkit/vSphere SDK for Perl which is present in the

VIMA/vMA virtual appliance provided by VMware. As a result, ghettoVCBg2 provides  a more proper backup solution that administrators can utilize in their  virtual infrastructure.

• ghettoVCBg2 - Free alternative for backing up VMs in ESX(i) 3.5 and 4.x (no SSH console required!)
• vMA - vSphere Management Assistant Documentation