Hello.
We are having some issues with our DHCP leasing, it is being duplicated, unique mac address are getting multiple ip address by the same DHCP Server.
This is our setup:
One mikrotik CCR1072 that is serving dhcp, hotspot, and routing to 3 different networks; the hotspot network is extended using a Cisco WLC and local Mode Cisco Aironet AP’s
this is the DHCP config
/ip dhcp-server
add address-pool=dhcp_pool4 allow-dual-stack-queue=no disabled=no interface=VLAN841_FASE1_SFP5 lease-time=1d name=Principal_Mikrotik_VLAN841
4 dhcp_pool4 172.21.0.50-172.21.31.254
We are getting blank mac address in some leases in the HS network, the leases are like this:
# ADDRESS MAC-ADDRESS HOST-NAME SERVER RATE-LIMIT STATUS
0 D 172.21.31.84 Principal_Mikrotik_VLAN841 busy
1 D 172.21.1.3 Principal_Mikrotik_VLAN841 busy
2 D 172.21.13.255 Principal_Mikrotik_VLAN841 busy
3 D 172.21.24.73 Principal_Mikrotik_VLAN841 busy
4 D 172.21.31.134 Principal_Mikrotik_VLAN841 busy
5 D 172.21.1.142 Principal_Mikrotik_VLAN841 busy
6 D 172.21.1.82 Principal_Mikrotik_VLAN841 busy
7 D 172.21.23.136 Principal_Mikrotik_VLAN841
looking at the arp table of this ip address, we can get the correct mac address, but it seems that this MAC got another lease from the same server. Some mac-address get more than 2 different IP’s
I am trying to figure it out why this is happening, i would appreciate any help in this regard.