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CenturyLink C4000 series (C4000BG/BZ/LG/LZ/XG): own router and bridge mode

Can I use my own router with the CenturyLink C4000 series (C4000BG/BZ/LG/LZ/XG)?

Yes

Transparent Bridging in WAN settings (confirm VLAN with CenturyLink)

  • Bridge modeYes, documented by the ISP
  • IP PassthroughNot applicable
  • Own routerYes, documented by the ISP

Checked October 26, 2026Confidence: medium3 sources

CenturyLink's WAN settings page documents choosing Transparent Bridging as the ISP Protocol for its newer modems; the C4000 guide links to this page.

Model numbers: C4000BG, C4000BZ, C4000LG, C4000LZ, C4000XG · Type: Gateway (modem + router)

How to set it up

  1. Open the modem's admin pages and choose WAN Settings in the left sidebar.
  2. Select Transparent Bridging for the ISP Protocol.
  3. Chat with CenturyLink tech support for the transport mode (VLAN setting) that works in your area; it is not available in all areas.
  4. Apply.

Know before you switch

  • CenturyLink says not to change WAN settings unless instructed by a CenturyLink technician or an IT professional.
  • The page says 'newer CenturyLink modems' and does not name individual models; the C4000 page links to it.

How sure are we?

Confidence is medium. Family-level statement.

This page reports what the ISP documented on the date above. ISPs change firmware and policy; if your gateway screen differs, trust your ISP's current page.

Quick answers

Can I use my own router with the CenturyLink C4000 series (C4000BG/BZ/LG/LZ/XG)?

Yes. Transparent Bridging in WAN settings (confirm VLAN with CenturyLink)

Does the CenturyLink C4000 series (C4000BG/BZ/LG/LZ/XG) have bridge mode?

Yes, documented by the ISP.

Does the CenturyLink C4000 series (C4000BG/BZ/LG/LZ/XG) support IP Passthrough?

Not applicable.

How sure is this answer?

Confidence: medium. Family-level statement. Checked October 26, 2026 against 3 ISP sources.

Sources and retrieval dates

  1. CenturyLink: WAN settings (Transparent Bridging)centurylink.com · read October 26, 2026
  2. CenturyLink: C4000 modem user guide (links to WAN settings)centurylink.com · read October 26, 2026
  3. CenturyLink: Modem and equipment support (model list)centurylink.com · read October 26, 2026

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