Archive for the 'Firewall' Category

Mac OS X 10.5 Leopard built-in firewall

9 Comments Published by Felipe Alfaro Solana November 10th, 2007 in Firewall, Mac OS X, Security

The firewall in Mac OS X 10.5 Leopard is confusing, to say the least. It is not enabled by default, which is a huge mistake, in my humble opinion. Also, the graphical user interface offers less flexibility than in previous version while trying to configure it. Besides allowing you to independently control the blocking of [...]

Linksys, OpenWRT and multiple VLANs

14 Comments Published by Felipe Alfaro Solana July 19th, 2006 in Firewall, Linux, Networking, OpenWRT, Security, VLAN

The Cisco Linksys WRT54G/GS/GL is made up of a six-port configurable switch, a standard Ethernet controller (usually a Broadcom controller named eth0) and a Wireless controller (usually a Broadcom controller named eth1).
The following diagram tries to illustrate the different components that made up the Cisco Linksys and how are they interconnected:

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FreeBSD firewall using PF

1 Comment Published by Felipe Alfaro Solana November 12th, 2005 in Firewall, FreeBSD, Networking, Security

FreeBSD supports OpenBSD’s powerful firewall PF since version 5.3. The scenario I was pursuing was firewalling one of my FreeBSD machines:
Incoming firewalling

Only incoming SSH connections from known SSH clients should be accepted.
Only incoming Syslog traffic from known Syslog clients should be accepted.
Only incoming ICMP Echo-Reply, ICMP Echo-Request and ICMP Destination-Unreachable datagrams should be accepted. Any [...]