01-17-2018 02:24 AM
This has gone on long enough for us all.
If you are affected by this - please log a curt ticket referencing this forum post specifically and ask for an ETA.
If we can't get a response from anyone here - we will have to go to them.
05-08-2018 01:41 PM
After a long time I upgraded to 3.9.27
I disabled the dhcp snooping for the whole site. DHCP is working fine. But I am now facing issues with HomeKit devices, that are now reported as not responding. I am also rolling back to 3.9.6
I bought this stuff to have a stable network, but the firmware messes all that up.
05-10-2018 02:12 PM
Your only option if you can't live with bugs or old firmware is to change hardware.
Vote with your feet - stop buying unsupported, untested and unreliable hardware.
05-11-2018 09:43 AM - edited 05-11-2018 09:44 AM
I discovered that in my system if I stopped all multicast and broadcast traffic on my network this dhcp issue would go away. For some reason multicast or broadcast traffic on any vlan would block dhcp across all vlans. I still rolled back the firmware on my switches though as permanently disableing multicast and broadcast traffic on my system is not an option.
05-11-2018 12:07 PM - edited 05-11-2018 01:29 PM
You're not wrong.
But don't underestimate how much time this problem costs. The first few folks who had this issue wasted a lot more time than someone who quickly arrived to this page and found a solution. It's going to happen again and again.
I'm not even going to get into what this could cost you from a SLA / customer confidence perspective.
05-11-2018 12:16 PM - edited 05-11-2018 12:16 PM
If you disable DHCP snooping on the entire site, you do not need to roll back.
Where did you find that option? I am not seeing any place in the settings to disble DHCP snooping.
05-11-2018 12:30 PM
I was hit with this problem early on. I found the answer on this thread or a link off this thread.
You will need to create properties file to make it permanent. I got information from this thread https://community.ubnt.com/t5/UniFi-Routing-Switching/Disable-DHCP-Snooping-on-USW/td-p/1510229
and adapted it it for my needs.
05-11-2018 02:57 PM
I applied the change with the old firmware installed and then updated. The settings propagated through to the new firmware. If this will still work in the future I don't know, but I assume it will.
My undersatnding is that you have to make the change globally by creating the config file at the controller to make it permanent. (These instructions are near the end of the first page) Acording to the other thread if you just change it on the switch via SSH it will be erased every time you provision the switch. Also if you leave the mac address out of the command then it will apply to all switches in the system.
05-11-2018 02:59 PM - edited 05-11-2018 03:00 PM
Are trusted DHCP server ports configurable in Unifi UI? If not, UBNT shouldn't be enabling DHCP snooping if you can't define server ports. It's a guarantee for problems.