Timothy Jazz

Q: DHCP Server and Access Rules Conflict

Hello!

 

I've had to configure my Mac Mini running El Capitan/Server to be "Allow All" as its default firewall rule, as that is the necessary setting to make IPv6 functional on OS X Server, so I've had to create a complex set of firewall rules to prevent exposure of interior services to the public Internet through the Airport Extreme I use as a boundary router.

 

The rules are complex, and effectively filter the ports necessary for me to feel comfortably with the server, but I have an ongoing issue with DHCP and the Access rules after reboot.

 

The access rules for DHCP are set up as 67-68/Both TCP and UDP for Private network and Unassigned (0.0.0.0) and as long as the Server is functioning, it works great.  The minute I reboot?  DHCP fails.  Delete the access rules and rebuild them?  It works great.

 

Anyone have any idea what might be going on here? I don't see any specific error log stuff related to access control settings, so I'm puzzled as to how to fix it permanently.

 

Thanks.

 

Timothy

Mac mini, OS X El Capitan (10.11.5), Server 5.1.5

Posted on Jul 29, 2016 12:00 PM