这似乎应该是简单的，但我找不到任何实际的信息：有可能有两个独立的服务器，一个运行dnsmasq做DHCP而TFTP（或HTTP）服务器运行在一个单独的机器上？
从dnsmasq示例configuration
# An example of dhcp-boot with an external TFTP server: the name and IP # address of the server are given after the filename. # Can fail with old PXE ROMS. Overridden by --pxe-service. #dhcp-boot=/var/ftpd/pxelinux.0,boothost,192.168.0.3 # If there are multiple external tftp servers having a same name # (using /etc/hosts) then that name can be specified as the # tftp_servername (the third option to dhcp-boot) and in that # case dnsmasq resolves this name and returns the resultant IP # addresses in round robin fasion. This facility can be used to # load balance the tftp load among a set of servers. #dhcp-boot=/var/ftpd/pxelinux.0,boothost,tftp_server_name