[Dnsmasq-discuss] dnsmasq-dhcp: DHCP, proxy on subnet 192.0.2.0

Geert Stappers stappers at stappers.nl
Sat Jun 6 20:06:44 BST 2020


On Sat, Jun 06, 2020 at 07:06:05PM +0200, Geert Stappers wrote:
> Hi,
> 
> The plan is that dnsmasq DHCP server hands bootfile information
> in conjunction with an existing DHCP, a.k.a. proxy-DHCP
> 
> With dnsmasq fresh compiled from up-to-date git repository
> works this configuration file:
> 
> port=0
> interface=br0
> bind-interfaces
> dhcp-range=192.0.2.220,192.0.2.223
> dhcp-boot=ipxe.pxe
> enable-tftp
> tftp-root=/home/stappers/src/ipxe/src/bin
> log-dhcp
> 
> 
> Changing 'dhcp-range=' for the wanted  proxy-DHCP
> 
> port=0
> interface=br0
> bind-interfaces
> dhcp-range=192.0.2.0,proxy
> dhcp-boot=ipxe.pxe
> enable-tftp
> tftp-root=/home/stappers/src/ipxe/src/bin
> log-dhcp
> 
> 
> Silences the dnsmasq DHCP server.  The change closer
> dhcp-range=192.0.2.220,192.0.2.223
> dhcp-range=192.0.2.0,proxy
> 
> With
> dhcp-range=192.0.2.18,proxy
> the same effect ...
> 
> 
> Running dnsmasq  --no-daemon   shows
> dnsmasq: started, version 2.81-12-g619000a DNS disabled
> dnsmasq: compile time options: IPv6 GNU-getopt no-DBus no-UBus no-i18n
> no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC
> loop-detect inotify dumpfile
> dnsmasq-dhcp: DHCP, proxy on subnet 192.0.2.0
> dnsmasq-dhcp: DHCP, sockets bound exclusively to interface br0
> dnsmasq-tftp: TFTP root is /home/stappers/src/ipxe/src/bin  
> dnsmasq-dhcp: 4014338184 available DHCP subnet: 192.0.2.0/255.255.255.0
> dnsmasq-dhcp: 4014338184 vendor class: PXEClient:Arch:00000:UNDI:002001
> dnsmasq-dhcp: 4014338184 available DHCP subnet: 192.0.2.0/255.255.255.0
> dnsmasq-dhcp: 4014338184 vendor class: PXEClient:Arch:00000:UNDI:002001
> 
> 
> Network sniff with `tcpdump  -i br0 port bootpc or bootps` on the
> server, on the destinated proxy-DHCP server,  shows the incoming
> DHCP Discover request and DHCP Offer from existing DHCP server.
> Not show a reply from the dnsmasq server.
> 
> The "boot client machine" complains "PXE-53: No boot filename received"
> 
> 
> What is your  proxy-DHCP
> dhcp-range=192.0.2.0,proxy
> succes story?

port=0
interface=br0
bind-interfaces
dhcp-range=192.168.0.2.0,proxy
pxe-service=x86PC, "iPXE", ipxe.pxe
enable-tftp
tftp-root=/home/stappers/src/ipxe/src/bin
log-dhcp


Yes indeed,  not `dhcp-boot=` but `pxe-service=`
 
With that knowledge is it possible the read it
in dnsmasq manual page  ...

 
Regards
Geert Stappers
-- 
Silence is hard to parse



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