Hello, I have a problem with assigning ether 5 port as WAN port. When attempting to set ether 5 as a DHCP client, the message "Could not add New DHCP Client" appears on the slave interface (6) ". Previously, on another (damaged) Mikrotik model, it was enough to remove the ether5 from the bridge. Now I have the hAPac2 model.

[admin@...] > interface print
Flags: D - dynamic, X - disabled, R - running, S - slave
# NAME TYPE ACTUAL-MTU L2MTU MAX-L2MTU
0 R ;;; WAN1
ether1 ether 1500 1598 9214
1 R ;;; LAN1
ether2-master ether 1500 1598 9214
2 S ;;; LAN2
ether3 ether 1500 1598 9214
3 S ;;; LAN3
ether4 ether 1500 1598 9214
4 S ;;; WAN2
ether5 ether 1500 1598 9214
5 X ;;; WAN3
wlan1 wlan 1500 1600 2290
6 X wlan2 wlan 1500 1600 2290

What version of RouterOS do you have on hAPac2? If lower that 6.40, then you have master port config in each interface. Check it.

Version: 6.40.5 (stable)

I'm sorry. Lower than 6.41. You have master port default config. Eth 3, 4, 5 are slaves for Eth2. You can see it in interface config.

I have a dial telephone to sell you!! Make sure your using latest OS version for features and security!!

After updating the Mikrotik software. I could easily change Lan to WAN.

Thank you for your help. Problem solved.