DHCP/PXE booting hangs just after "option: 43 vendor-encap"

[mapryan]

Hi all

I followed the instructions on how to configure a Raspberry Pi for network boot from the website. My dnsmasq.conf file on the server looks like this:
port=0
dhcp-range=192.168.1.255,proxy
log-dhcp
enable-tftp
tftp-root=/tftpboot
pxe-service=0,"Raspberry Pi Boot"

Using tcpdump, I can see the boot request come from the Pi over the network:
21:51:23.066981 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from b8:27:eb:ac:3f:81 (oui Unknown), length 320
21:51:23.229204 IP 192.168.1.43.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 314

However, it always just show this in the daemon.log file over and over:
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 available DHCP subnet: 192.168.1.255/255.255.255.0
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 vendor class: PXEClient:Arch:00000:UNDI:002001
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 PXE(eth0) b8:27:eb:ac:3f:81 proxy
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 tags: eth0
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 broadcast response
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 sent size: 1 option: 53 message-type 2
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 sent size: 4 option: 54 server-identifier 192.168.1.43
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 sent size: 9 option: 60 vendor-class 50:58:45:43:6c:69:65:6e:74
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 sent size: 17 option: 97 client-machine-id 00:44:44:44:44:44:44:44:44:44:44:44:44:44...
Jan 15 21:51:23 raspberrypi dnsmasq-dhcp[1940]: 653460281 sent size: 32 option: 43 vendor-encap 06:01:03:0a:04:00:50:58:45:09:14:00:00:11...

Any thoughts or ideas on why it always hangs just after option 43?

I also tried with an SD card in the pi with the latest bootcode.bin file on the card, yet the behaviour is exactly the same

Thanks in advance for any help/suggestions

Cheers

Mike

[DougieLawson]

Try

Code: Select all

dhcp-range=192.168.2.10,192.168.2.40,300h

[mapryan]

Try

Code: Select all

dhcp-range=192.168.2.10,192.168.2.40,300h

Fantastic, that was it! Worked first time

This was the page I used to do the install and configuration - https://www.raspberrypi.org/documentati ... utorial.md

Does it need updating or was I doing something wrong?

Cheers

[DougieLawson]

If you're going to proxy your existing DHCP server with DNSmasq you need to know the broadcast address for the primary (WiFi) interface on the TFTP/DHCP server machine. That DHCP server needs to be contactable as DNSmasq is going to request a DHCP address from the existing DHCP server.

My alternative sets DNSmasq up as a self contained DHCP server with it's own private address block. But the assigned addresses won't be routeable to the public internet or even to your home LAN.

[mapryan]

If you're going to proxy your existing DHCP server with DNSmasq you need to know the broadcast address for the primary (WiFi) interface on the TFTP/DHCP server machine. That DHCP server needs to be contactable as DNSmasq is going to request a DHCP address from the existing DHCP server.

My alternative sets DNSmasq up as a self contained DHCP server with it's own private address block. But the assigned addresses won't be routeable to the public internet or even to your home LAN.

Ah, I hadn't realised that's what it was doing. I was disabling DHCP on the router when trying to boot the Pi, so that makes sense now.

Cheers