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Fire Wall

What is firewall?

An Internet firewall is a set of hardware and software components that restricts access between a protected network and the Internet. It can be used to block unwanted or dangerous traffic and provide a single control point for all access between the Internet and the protected network.

The Campus Firewall

The University maintains a firewall which protects the whole of the University's network. This firewall blocks incoming connection attempts by default, except to those services which we can offer safely. Outgoing connections are permitted by default.

All network traffic from Ovid to the your site should be in response to requests which users have generated. Thus, if your site is using a stateful protocol inspection (SPI) firewall, you should not have to open any ports on your firewall. Email is the exception, and you should allow TCP/25 from the address ranges listed below.

Should you use a non-SPI firewall, you will need to allow ephemeral (high numbered) TCP port access from the following IP address ranges. In order to allow Ovid the ability to expand/upgrade service without impacting connectivity, the entire range should be allowed, and not just the gateway addresses.

There are several types of firewall techniques:

  • Packet filter: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
  • Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.
  • Circuit-level gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.
  • Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.
  • If you have been using the Internet for any length of time, and especially if you work at a larger company and browse the Web while you are at work, you have probably heard the term firewall used. For example, you often hear people in companies say things like, "I can't use that site because they won't let it through the firewall."
    If you have a fast Internet connection into your home (either a DSL connection or a cable modem), you may have found yourself hearing about firewalls for your home network as well. It turns out that a small home network has many of the same security issues that a large corporate network does. You can use a firewall to protect your home network and family from offensive Web sites and potential hackers.

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