Firewalls

1
Firewalls Network Security

• Protecting your network.

2
Your Network An Exclusive Club

• Your Firewall is Your Bouncer
• Checks the Traffic's ID.
• Ports are like doors into different parts of the
  club.
• Permits allowed traffic, blocks denied traffic.
• Logs are your security video tapes.

3
Network Firewall

• Protects entire network Provides NAT
• Can provide a DMZ
• Hardware device.
• Range from inexpensive (Linksys, D-Link) to
  expensive (Cisco, Checkpoint) depending on your
  network.

4
Personal Firewall

• Installs on individual PCs.
• Protects a single machine.
• Free versions and for-pay versions.
• ZoneAlarm, various anti-virus software.

5
What a Firewall Doesn't Do

• Scan for Viruses
• Update Your Computers
• Back Up Your Computers
• Keep Your Passwords Safe
• Think Layers A firewall is just a piece of the
  security onion.

6
Wireless Freedom (Of Information)

• By default, unencrypted.
• WEP is breakable, but better than nothing.
• Turn on MAC address security.
• Turn off SSID broadcast.
• Newer technologies (802.1x, WPA, 802.11i) more
  secure, but more expensive.
• VPN more secure, but more expensive.

7
Web Server Security

• A firewall might not protect you.
• Patch/update the web server regularly (IIS or
  Apache).
• Look out for old CGI progams.
• Remove all sample/example programs that come with
  the web server.
• Use a secure method for updating the server (not
  FTP).
• Keep your database separate from your web server.