This wireless network has been up for about a year with no issues, but today the majority of clients cannot access the network (2 clients have connected to the Unifis but there should be many more).
The RB750 log contains “DHCP warning info … server offering lease (ip) for (mac) without success” entries which I’ve not seen before.
The have been no configuration changes on the RB750 since it was setup. I have re-booted the router and upgraded to v6. We are using a DMA Softlab Radius Manager v3.9 to authenticate the clients which has also had a reboot.
The APs are mixture of Ubiquiti Unifis and TP-Link TL-WA701NDs connected to TP-Link un-managed switches spread over 4 blocks.
Ether2 on the RB750 is receiving 30Mbps and I cannot see any of the connected clients generating this traffic. In Winbox I have disabled each AP in turn to see if this firgure dropped, my thinking being that perhaps an AP has gone U/S and is spraying packets onto the network. Perhaps it might be a port on a switch, but I don’t think I can test for this without being on-site.
All APs have static IPs and are showing as bound in the DHCP Server Leases list (apart from a couple that are showing as unbound, but these pre-date this issue). The APs and switches have not been rebooted as I can’t get to site until next week, therefore any help greatly appreciated!
i had this issue to. I downgraded the router to 4.x. and all is ok. I also just get this on hotspot. Have not tried to figure out why and what, just saw that the error og away.
How can I downgrade the MikroTik RouterOS™ installation to an older version?
You can downgrade by reinstalling the RouterOS™ from any media. The software license will be kept with the HDD as long as the disk is not repartitioned/reformatted. The configuration of the router will be lost (it is possible to save the old configuration, but this option has unpredictable results when downgrading and it is not recommended to use it).
Another way is to use the /system package downgrade command. This works only if you downgrade to 2.7.20 and not lower. Upload the older packages to the router via FTP and then use the /system package downgrade command.
Pretty nervous about losing all access and not being able to restore the old config
make Your self a .backup a export and a export compact. Then you should be just fine. If something dont work and all goes down. Upgrade, and import backup.
I have 60 towers with ubiquiti APs on top and a mikrotik, running 4.17 and now 5.21, at the base. I’ve not seen this problem. I would power cycle one unmanaged switch at a time and see if the 30mbps RX goes away. Maybe just unplug devices from the switch first. It sounds like the problem I had in the office when someone plugged both ends of an Ethernet cable into the same unmanaged switch.
I would only consider downgrading after everything else checks out.
It’s 4 student blocks, so I wouldn’t be surprised if someone has taken out one of our APs, plugged in their own equipment and created a loop. All the switches are in locked service cupboards, but you never know who has access. I ran a Torch on Ether2 and the 30mbps RX is ARP.
Thanks - think I’ve found them. They have static IPs and neither are bound in the DHCP lease list. Looks like I’ll need to physically remove them from the network as I don’t think there’s much I can do remotely.
