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