ResNET

The ResNet area is made up of the networking in the Student Residence area of the Campus.

ResNet Traffic - Firewall

The ResNet Firewall only permits incoming TCP/IP traffic to:

  • Web servers on port 80 (but only when specifically requested, see below)
  • Ident server on port 113

Special ports and protocols can be opened when it is related to an academic requirement or other special circumstance. Game playing doesn't fall into one of those categories.

Generally all outbound connections are allowed. Certain protocols and ports may be blocked in response to any traffic that adversely affects network usage, specifically during heavy virus/worm activity.

Differences Between Static IP and DHCP Assignment

Static IP and DHCP are two very different ways of obtaining an IP address for your computer.

DHCP (Dynamic Host Configuration Protocol) allows your computer to automatically obtain a fully functional IP address from the central RPI DHCP server. Every time you boot up your computer, your operating system retrieves a new IP address. DHCP is the default network configuration for most operating systems. If, however, you need to set up DHCP again, follow the instructions on the various Network Configurations webpages for your specific operating system.

In contrast, static IP is a manual way of obtaining an IP address for your computer, where the IP address is pre-determined and always the same. Web servers and FTP servers are good examples of machines which would require static IP addresses.

Students who wish to run their own server on ResNet would also require a static IP address; please refer to the Hosting a Personal Web Server on ResNet section of this website for more information.

Static IP advantages and disadvantages

There are both advantages and disadvantages to using a static IP address.

Advantages Disadvantages
Your IP address remains the same so that you can run Internet services that require your IP address to remain the same in order for them to work properly. You will only be able to effectively use your static IP address from your place of residence. You will be unable to use the web from other places on campus.
If, for some reason, the RPI DHCP server is having difficulties handing out IP address, you will still be able to access the web, since your IP is predetermined. Configuring the network settings on your computer is more difficult for static IP than for DHCP, since DHCP is automatic and static IP is manual.

Hosting a Personal Web Server on ResNet

The campus firewalls now block inbound web services (TCP port 80) to the campus ResNet system. This affects students hosting a personal web server on ResNet in that off-campus access to the server will not be allowed by default.

Students wishing to host a personal web server on ResNet may do so on-line by completing the ResNet Static IP Request to obtain a static IP address for their server from the Hostmaster. The static IP address will usually be assigned within one business day. Firewall changes can take up to 5 business days. You can check back to see the status.

Firewall changes for a student's personal web server will remain in effect for the academic year. After that time, if the change is still required for the following academic year, the student will need to submit a new request.

Campus firewalls will do application inspection of inbound traffic on TCP port 80 (http) to ensure protocol validity.