The very first step is to set the --log-dhcp option and look at the
logs, that should give you clues as to what is happening and more
information to supply here if it doesn't make sense to you.
Cheers,
Simon.
On 10.05.2026 10:25, Max Boon wrote:
Hello,
I have a bunch of switches that have previously been supplied with IP
addresses using isc-dhcpd that I am now replacing with dnsmasq. There is
an address range for automatically assigned IP's and the rest with
static host assignments, all in the same /24 subnet.
The static assignments are assigned using option 82 circuit-id to set a
tag which is then matched in the dhcp-host declaration. For the most
part I have managed to get it working, but I have noticed something in
my logs which I am not sure is a bug or just my general lack of
understanding...
Basically, if a DHCP inform packet comes in, the circuit-id gets
matched, and a corresponding ack gets sent by the server. However, if a
DHCP request comes in, the server doesn't seem to be able to match the
circuit ID at all and responds with "/dnsmasq-dhcp[5631]: no address
range available for DHCP request via eth0/*"*
I have confirmed using tshark that the incoming DHCP request packet
contains a circuit-id that matches an assigned dhcp-host entry.
My dnsmasq.conf has only the following range:
dhcp-range=172.16.127.16,172.16.127.49,255.255.255.0,12h
I have a seperate .conf containing the static entries, repeated like so:
dhcp-circuitid=set:lag_103_1309_91,lag-103:1309.91
dhcp-host=net:lag_103_1309_91,172.16.127.141,Switch1
dhcp-option=net:lag_103_1309_91,12,Switch1
dhcp-circuitid=set:lag_104_1408_93,lag-104:1408.93
dhcp-host=net:lag_104_1408_93,172.16.127.139,Switch2
dhcp-option=net:lag_104_1408_93,12,Switch1
Best Regards,
Max
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