Unfortunately, this approach seems to be flawed as the dnsmasq service complains that empty string is an invalid option and never comes up. Specifically, for "red" tags, I tried the following configuration to override the global tftp-enable setting: dhcp-option=tag:red,option:tftp-server,""Ähcp-option=tag:red,option:tftp-server-address,""Ähcp-option=tag:red,option:boot-file-size,""Ähcp-option=tag:red,option:bootfile-name,"" When configuring a Cisco router or switch as a DHCP server, the tftp option line would be: option 150 ip 192.168.0.1 - for a Cisco phone option 150 ascii '192.168.0. The only remaining question, then, is how to specify individual dhcp-option disablement for the target. According to the docs, this will cause dnsmasq to clear its host cache and reload the hostsdir configs. sudo aptitude install tftpd-hpa tftp-hpa cd /etc/default sudo cp tftpd-hpa tftpd-hpa. Namely, (1) the global config sets enable-tftp and (2) the hostsdir config for the target starts as ,set:red and (4) hit dnsmasq with SIGHUP. In your DHCP pool, you can define both the TFTP server and the boot file using the following format: ip dhcp pool DHCPPoolLAN next-server x.x.x.x bootfile pxelinux. This was working fine, but I appear to have hit the limits of my dnsmasq-fu when attempting to toggle the DHCP options for a particular end host. About this task, If you are using the ISC DHCP server, you can add the DHCP option 66 and 67 to a group of UEFI targets or to a single UEFI target by adding, respectively, the statement options tftp-server-name and option bootfile-name 'Rembo-å4UEFI' to a section of the configuration file. DHCP Options in Plain English, Updated on July 12th, 2021, The following tables list common, configurable DHCP options.If you do not have the name of the server and if the server is configured only with the IP address, then use the option code ip ip address command. The DHCP options can be configured with the option code ascii string tftp-server-name command. I'm doing some firmware-related work and am using a -dhcp-hostsdir setup with dnsmasq to test several devices on my LAN. Other than TFTP, 150 option is also available for these: 150 Etherboot.
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