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21.7 Legacy Series / v21.7.4: DHCPv4 DHCPDISCOVER blocked,when bogon blocking is active
« on: October 28, 2021, 08:49:03 am »
Do you have "block bogons" active on your internal interface?
I discovered in the night after upgrading to 21.7.4, that a standard DHCP DISCOVER from 0.0.0.0 -> 255.255.255.255 was blocked due to bogons.
And yes, in the automatic generated rules bogon blocking is before DHCP rules.
Therefore a standard DHCP DISCOVER will be blocked as 0.0.0.0 can be a bogon address.
Anyone else already saw that behavior?
In the moment I unchecked the bogon blocking on the internal interface for having a working DHCP server on OPNsense.
BR
Andy
I discovered in the night after upgrading to 21.7.4, that a standard DHCP DISCOVER from 0.0.0.0 -> 255.255.255.255 was blocked due to bogons.
And yes, in the automatic generated rules bogon blocking is before DHCP rules.
Therefore a standard DHCP DISCOVER will be blocked as 0.0.0.0 can be a bogon address.
Anyone else already saw that behavior?
In the moment I unchecked the bogon blocking on the internal interface for having a working DHCP server on OPNsense.
BR
Andy