Network Overview

IP Addresses

Campus Public IP Space

The University of Arkansas has been allocated public IP space in the range of 130.184.0.0/16. Building networks are currently being converted to use private IP space, bringing increased security, hostname-based dynamic DNS and increased subnet capacity. Moving forward, public IP addresses will be assigned on a case-by-case basis only.

Campus Private IP Space

Each building network provides a Class A IPv4 subnet and an IPv6 subnet. IPv4 addresses are private and not accessible directly from the internet. Network address translation (NAT) is used to pass traffic to the Internet. All private addresses can be directly accessed on-campus.

Devices are automatically assigned a temporary address through DHCP, starting at the top end of each IP range. Static IP addresses are assigned at the bottom of the range.

For example:

Subnet 10.4.0.0/21
Subnet mask 255.255.248.0
IP range 10.4.0.1 to 10.4.7.254
Dynamic range 10.4.0.100 to 10.4.7.254
Static range 10.4.0.6 to 10.4.0.99
Reserved for
network infrastructure
10.4.0.1 to 10.4.0.5

 

NAT (Network Address Translation)

Private IPs NAT at the campus central firewall to Internet hosts only. Private networks route to all Campus IP space, including 130.184.0.0/255.255.0.0 directly. Currently, an external IP will appear as an address in the 130.184.253.0/255.255.255.0 subnet. Most applications will operate in a NAT environment.

Private Static IP Policy

  • Reserved IP blocks for static IP allocation outside of DHCP ranges
  • Users can request static IP addresses by creating a ticket.
  • Approved campus IT can use the Infoblox Grid tool at passage.uark.edu to register static IP devices
    • NET must approve changes and additions
    • Changes can be scheduled to take effect at a specific time

DNS

The domain name system (DNS) servers on campus answer requests from local clients when resolving internet domain names to IP addresses. These servers also answer outside requests for uark.edu or other campus-hosted websites.

DNS server addresses are configured automatically on most devices using DHCP. Devices configured with static IPs or other devices not using DHCP must be configured with the DNS server addresses listed below.

  IPv4 IPv6
Primary DNS Server 10.250.1.50 2604:fc00:c:250::1:50
Secondary DNS Server 10.58.8.50 2604:fc00:dc:1061::8:50

Note: For security reasons, access to outside DNS servers like Google DNS or Open DNS are not allowed.

Network Time Protocol Server

The following DNS server is used for network time protocol (NTP), synchronizing time for computers and mobile devices on campus.

ntp.uark.edu


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