topic Re: How can I create a DHCP for a different subnet in 1900 Appliance(R81.15)? in Spark Firewall (SMB)

How can I create a DHCP for a different subnet in 1900 Appliance(R81.15)?

Sho133812 — Fri, 22 Aug 2025 07:57:31 GMT

Hi All,

I am trying to create multiple DHCP settings for the VLAN100 interface. For example, if the VLAN100 interface is 10.100.1.1/24 and an L3 switch is connected under Spark, where DHCP relay is set up on the L3 switch side. If I want to set the DHCP settings for clients 10.100.2.0/24 and 10.100.3.0/24, which are under the L3 switch, on the Spark side, how should I do this?

Re: How can I create a DHCP for a different subnet in 1900 Appliance(R81.15)?

PhoneBoy — Fri, 22 Aug 2025 22:17:07 GMT

In the WebUI, you can only configure DHCP for the local LAN.
We use dnsmasq for DHCP and I believe you can manually edit the configuration file in /pfrm2.0/etc/dnsmasq.conf
This will require restarting the underlying dnsmasq process.
Not sure this will survive reboots or upgrades, though.