[Dnsmasq-discuss] PXE service across subnets

[GARRISON, TRAVIS J.]

>> We have tried searching but we could not find an answer to our problem.
>> Our clients cannot pxe boot from our dnsmasq server across different 
>> subnets. We have the dnsmasq server configured to proxy the dhcp 
>> requests to our main dhcp server. We have created helper addresses for 
>> both the dhcp and pxe server on the different subnets. Pxe booting 
>> works fine when on the same network. What are we missing?
>>
>
>Is anything logged by dnsmasq? The DHCP helper function needs to relay broadcasts to both servers. Are you sure that the switches can do that?

We did a packet capture on the dnsmasq server and tried to pxe boot one of our clients. We can see 3 DHCP Discover requests come in from the 172.25.16.0 subnet, which would be our client, but we see no response from the dnsmasq server. We have the option dhcp-range=172.25.16.0,proxy set. Our networks are in the 255.255.252.0 subnet range, would that have any problems?

Thanks
Travis