--leasequery[=<addr>[/<prefix>]]

Enable RFC 4388 leasequery. The dnsmasq DHCP server will answer LEASEQUERY messages from DHCP relays when this option is given. If an address or subnet is given, only queries from a relay at that source are allowed. Repeat the --leasequery option to specify multiple allowed sources. To correctly answer lease queries it is necessary to store extra data in the lease database, and this is also enabled by the --leasequery option. The extra fields (agent-info and vendorclass) are stored in the leases file in a somewhat backwards compatible manner. Enabling and then disabling leasequery will not cause problems; the extra information will be aged out of the database. However, enabling leasequery in release 2.92 or later, storing leases which come via DHCP relays which add option-82 agent-info data, and then moving back to a pre-2.92 dnsmasq binary may cause problems reading the leases file. As of release 2.92, leasequery is only supported for DHCPv4.