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Using your Zyxel C2100Z modem

Older CenturyLink modem

This modem is being retired — time to get a replacement!

Zyxel C2100Z modem

Download the Zyxel C2100Z info sheet

Features of the Zyxel C2100Z

WiFi supported:  2.4 GHz 802.11 b/g/n

 

IP compatibility:  IPv4, IPv6

Works with these CenturyLink internet services:

  • ADSL – up to 7 Mbps
  • ADSL2 – up to 20 Mbps (40 Mbps pair-bonded)
  • VDSL2 – up to 40 Mbps (100 Mbps pair-bonded)
  • Fiber (GPON) - up to 940 Mbps

*Customer speed experiences will vary, particularly when accessing the internet wirelessly from different devices. Maximum download/upload speeds given are via a wired connection. Internet speeds are not guaranteed due to conditions outside of network control, including customer location, devices, equipment, and access over a wired or wireless connection; see centurylink.com/internetpolicy for more information.

Modem troubleshooting tips

  • Did you know?  If your internet connection is spotty or slow, the best place to start is to reboot your modem.

  • Still not running right? Check to see if your modem firmware is up to date.

Download the latest firmware for the C2100Z

Tip: If the firmware link doesn't work, try another browser (Chrome is known to have issues with this kind of link). Or, right-click the link, select "copy link address", then paste the link into a new browser tab.

Quick setup

Manual network (WAN) setup

If instructed to do so by a technician, you may need to change the WAN settings on your modem manually. Visit the WAN setup page for step-by-step instructions on different WAN configurations, including PPPoE, IPoE and transparent bridging.

Your modem's wireless settings control the WiFi network in your home. Click on the options below for details and step-by-step instructions.

Helpful WiFi topics

The modem status area of the user interface allows you to view several options and check how your modem is running. 

  • Firewall status
  • Device table
  • NAT table
  • Routing table
  • QoS table
  • Resource table

The utilities menu gives you access to several additional tools to manage and test your modem. 

  • Back up settings (Configuration save)
  • Diagnostic test
  • Web activity log
  • System log
  • Time zone

Advanced settings give you even more control over your modem's configuration. Most of these are best for tech-savvy folks who are familiar with modems and networking. 

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