[Dnsmasq-discuss] help with 'tag' option for multiple subnets

Jimmy Vance flhxs14 at gmail.com
Wed Apr 18 17:18:18 BST 2018


I have a simple dnsmasq configuration that handles PXE for BIOS PXE as well
as UEFI PXE and this works well. I need to add a second subnet and planned
on using the same system to act as the DHCP server for both subnets. I know
how to add a tag to options, but for UEFI I already have a tag set, and
cannot figure out how to add the proper tags to have these options serve
both subnets properly

Current config

dhcp-range=set:subnet1,172.16.17.100,172.16.17.254,1d
dhcp-option=tag:subnet1,3,172.16.17.1
# BIOS ipv4 PXE
dhcp-boot=pxelinux.0,reposerver,172.16.17.15
# UEFI ipv4 PXE
dhcp-match=set:efi-x86_64,option:client-arch,7
dhcp-boot=tag:efi-x86_64,EFI/bootx64.efi,reposerver,172.16.17.15

Adding additional subnet

dhcp-range=set:subnet1,172.16.17.100,172.16.17.254,1d
dhcp-option=tag:subnet1,3,172.16.17.1
dhcp-range=set:subnet2,192.168.17.100,192.168.17.254,1d
dhcp-option=tag:subnet2,3,192.168.17.1

# BIOS ipv4 PXE
dhcp-boot=tag:subnet1,pxelinux.0,reposerver,172.16.17.15
dhcp-boot=tag:subnet2,pxelinux.0,reposerver,192.168.17.15

# UEFI ipv4 PXE
dhcp-match=set:efi-x86_64,option:client-arch,7
dhcp-boot=tag:efi-x86_64,EFI/bootx64.efi,reposerver,172.16.17.15

I haven't had any luck running across a similar configuration that explains
how to handle the existing tag in the UEFI section so I can specify
different IP addresses for each subnet.

Any ideas or suggestions welcomed
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