RFC 2132 defines DHCP option 66 as the TFTP server name option. It identifies a TFTP server when the 'sname' field in the DHCP header has been used for DHCP options.
Checked 2026-10-02
This option is used to identify a TFTP server when the 'sname' field in the DHCP header has been used for DHCP options.
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- DHCP option 66
- Deployment
- on-premises
- Region
- not restricted
- Release range
- RFC 2132
- Checked
- 2026-10-02
Sources
- RFC 2132: DHCP Options and BOOTP Vendor Extensions — RFC Editor (IETF) · tier 1 standards and regulators · Section 9.4 (TFTP server name)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name. WarmTransfer. https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name
BibTeX
@misc{warmtransfer-claim-ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name,
title = {Troubleshooting IP phones that do not get a voice VLAN or DHCP options: source note ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name},
note = {Source note ip-phone-dhcp-vlan-troubleshooting-opt66-tftp-server-name, checked 2026-10-02}
}