Hi, I'm a bit confused about whether or not this is possible to do:
I have the following topology: DHCPServer --- LAN2 --- DHCPRelay ---
LAN1 --- device
DCPServer is dnsmasq
DHCPRelay is a python app that I wrote
The device sends a Discover and the relay receives it and then relays
this to the DHCPServer on a different subnet. But my relay has 2
network interfaces. The DHCPServer has no route to LAN1. If the relay
sets giaddr to the IP of the LAN1 interface, then a range is found, an
IP is selected from that range, and the response is returned to the
address of 'giaddr'. But that address is not routable on LAN2.
If I configure the DHCPRelay to set giaddr to the IP of the LAN2
interface of the relay, then DNSMasq complains that "no address range
available for DHCP request via ...". I understand that DNSMasq will look
for the a range that matches the giaddr address, but I was under the
impression that setting option 82 with a circuitID and matching the
circuit ID would override that behaviour.
This is how I try to match option 82's circuit ID, in hopes that giaddr
will not be used to search for a pool
dhcp-circuitid=set:meow,MEOW
dhcp-circuitid=set:woof,WOOF
dhcp-range=tag:meow,10.222.221.10,10.222.221.19,255.255.255.0,12h
dhcp-range=tag:woof,10.222.222.10,10.222.222.19,255.255.255.0,12h
Am I wrong? If yes, then how can this be done? Or maybe giaddr should
stay the address of LAN1 but I could somehow tell the server to send
back the response to the source IP that was set in the IP header? I
would find it very restrictive if the dhcp server would need to have a
route to all networks that it defines ranges for.
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