OPNsense Forum

Archive => 20.1 Legacy Series => Topic started by: iam on July 12, 2020, 12:10:54 am

Title: DHCPv4 relay is not working on one VLAN
Post by: iam on July 12, 2020, 12:10:54 am

Hi,

I have different VLANs including the main LAN and the WiFi networks. The DHCP server runs on a different server in the main LAN. The opnsense is acts as DHCP relay on all VLANs except the main LAN.

This works inside all VLANs except the guest WiFi. I don't see any related request in the DHCPD log. The guest WiFi subnet is enabled on the DHCP server with a dynamic range. The DHCP relay is enabled for the guest wifi. IPv6 works inside the guest WiFi. But IPv6 is enabled only for the WAN and the guest WiFi.

Has anyone any idea?

Best,
iam

Title: Re: DHCPv4 relay is not working on one VLAN
Post by: opns_neuling on October 14, 2020, 10:41:02 pm

hi!
please post a portion of dhcpd.log files.

Title: Re: DHCPv4 relay is not working on one VLAN
Post by: Gauss23 on October 14, 2020, 10:47:54 pm

Wifi hardware manufacturer?

Unifi for example has a feature called DHCP guard. If enabled only the specified DHCP server is allowed for this network. Or maybe you have port isolation enabled for that network?

Title: Re: DHCPv4 relay is not working on one VLAN
Post by: iam on October 14, 2020, 11:47:06 pm

 Hi,

I investigated this issue more. It seems to be an OpenWRT (or hardware?) issue. The bridge of guest wifi and guest VLAN isn't working properly on 2  (same hardware) of 3 devices (different hardware).

Best,
iam